JPH11291451A - Guiding mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a hindrance due to collision of-a cam with a cam follower. SOLUTION: A cam is composed of plate cams 41 of a high strength material and a plate cam 43 of an elastic member. The plate cam 43 has a shape projecting from the plate cams 41 and therefore a cam follower 3 comes into contact with the plate cam 43 before it comes into contact with the plate cams 41. The shape of the plate cam 43 changes due to a force of impact and thereby it absorbs an impact load. When the cam follower 3 comes closer to the cam, a part of the plate cam 43 is changed in the shape by being pressed thereby and the cam follower 3 comes into contact with the lateral sides 41a of the plate cams 41. The cam follower 3 moves along the shapes of the plate cams 41.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide mechanism, and more particularly, to a method for reducing the impact between a guided body and a guide body.

[0002]

[Related Art and Problems] A gripper 11 as shown in FIG. 6 is employed in a sheet supply / discharge section of a sheet-fed printing apparatus. The gripper 11 is a chain drive mechanism (not shown)
Then, the chain is moved from the area A to the area B in the chain guide 12 while holding the printed paper. A cam follower 13 is attached to the gripper 11. When the gripper 11 further approaches the region B from the state shown in FIG. 6, the cam follower 13 and the cam 14 come into contact with each other. By this contact, the claw 15 of the gripper 11 is opened, and the held paper is separated from the gripper 11. With the claws 15 open, the gripper 11 turns around the center 18 in the area B along the chain guide 12. When the cam follower 13 separates from the cam 14, the pawl 15 closes.
The gripper 11 moves to the area A along the chain guide 12 with the claw 15 closed. By repeating this operation, the paper held in the area A can be separated in the area B.

However, the gripper 11 has the following problems. Generally, since the cam 14 and the cam follower 13 require strength, carbon steel or the like is employed. Therefore, a large load is applied to each of them due to the collision. As a result, wear, breakage of the cam follower, generation of noise, or vibration and load fluctuation on the camshaft and the like occur.

In order to solve such a problem, a cam 1
Although it is conceivable that the material No. 4 is made of a long-fiber reinforced thermoplastic resin, there is a limit to the load that can withstand even if only the material is changed.

An object of the present invention is to solve the above-mentioned problems and to provide a guide mechanism that can be used under a high load and that can reduce collision vibration.

[0006]

In the guide according to the present invention, the guide is formed so as to protrude from the non-deformed portion toward the guided body, and when it comes into contact with the guided body. A deformable portion is provided on the guided body contact surface so as to be deformable so that the guided body and the non-deformed portion come into contact with each other. Therefore, when the guided body comes into contact with the guide body, the deformable portion is deformed, and the impact at the time of the contact can be reduced. Further, the deformable portion is deformable to such an extent that the guided member and the non-deformed portion can be brought into contact with each other, so that the guided member moves along the guided member contact surface by the non-deformed portion. Since the non-deformed portion does not deform, it can withstand a high load. Thus, it is possible to provide a guide body that can reduce the impact at the time of the contact and can withstand a high load.

In the guide according to the present invention, the deformable portion is constituted by an elastic plate-shaped member, and the non-deformed portion is constituted by a non-deformed plate-shaped member slightly smaller than the elastic plate-shaped member. The side surface of the non-deformable plate member is the guided member contact surface. Therefore, with a simple structure, it is possible to alleviate the impact and use it under a high load.

In the guide according to the present invention, the elastic plate-shaped member is deformed on the side of the non-deformable guide portion where the guided member comes into contact and on the surface facing the elastic plate-shaped member. In this case, an escape portion is provided in which a part thereof can enter. Therefore, the non-deformable plate-shaped member can be reliably brought into contact with the guided member without the projecting elastic plate-shaped member being disturbed. This makes it possible to more reliably reduce the impact and use it under a high load.

In the guide mechanism according to the present invention, the guide body or the guided body is deformed when the guided body comes into contact with the guided body contact surface to absorb an impact, and
After the deformation, the guided body includes a non-deformed portion for performing a predetermined operation along the guided body contact surface. Therefore, the shock at the time when the guided body comes into contact with the guide body can be reduced by the absorbing portion. Further, the guided body can be moved along the guided body contact surface by the non-deformed portion. Since the non-deformed portion does not deform, it can be used under a high load. Thus, it is possible to provide a guide mechanism that can reduce the impact at the time of the contact and can be used under a high load.

In the guide operation control method according to the present invention, when the guided body comes into contact with the contact surface, the guide body or a part of the guided body is deformed to absorb an impact at the time of the contact. At the same time, the deformation is such that the guided body performs the predetermined movement along the abutting surface by another part of the guided body and the guided body that is not deformed. Therefore, the impact at the time of contact can be reduced by the deformation. Further, the guided body can be moved along the contact surface by the other portion that is not deformed. Thereby, the impact at the time of the contact can be reduced, and the device can be used under the high load.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A guide mechanism according to the present invention will be described with reference to the drawings. FIG. 1 shows a sheet discharging mechanism of a sheet-fed printing press using the present invention.

The function of the gripper 11 is the same as the conventional one. That is, the cam follower 3 is attached to the gripper 11. When the gripper 11 is moved by a chain driving mechanism (not shown) and the cam follower 3 as the guided body comes into contact with the cam 4 as the guiding body, the claw 15 of the gripper 11 is opened. When the cam follower 3 moves further and separates from the cam 4, the claw 15 closes.

Next, the details of the cam 4 will be described with reference to FIG. The cam 4 includes three plate cams as shown in FIG. 2B. The cam 41, which is a non-deformed plate member plate, is made of a high-strength material. In this embodiment, heat-treated carbon steel is used as the high-strength material. The plate cam 43, which is an elastic plate member, is formed of an elastic member.
It is sandwiched between two plate cams 41. The plate cam 43 is shown in FIG.
As shown in A, it has a shape protruding from the plate cam 41.
This is because the cam follower 3 has a plate cam 41 as described later.
This is because the plate cam 43 is brought into contact before contact with the plate cam 43. A concave portion 7 is provided at an end of the plate cam 41. As shown in FIG. 3, a plate cam 43 is provided on the side of the plate cam 41 where the cam follower 3 comes into contact, and on the surface facing the plate cam 43.
Is deformed, a part of which can enter
(Escape part) is provided. Therefore, as described later, the plate cam 41 and the cam follower 3 can be reliably brought into contact with each other.

The two plate cams 41 and 43 are fastened by screws 26 as shown in FIG.
The mounting holes 28 are formed through the plate cams 41 and 43.

Next, the shape change before and after the contact between the plate cams 41 and 43 and the cam follower 3 will be described with reference to FIG. FIG. 3A shows a state where the cam follower 3 is not in contact with the plate cam 43. When the cam follower 3 moves in a direction approaching the cam 4, the cam follower 3 first comes into contact with the plate cam 43. The plate cam 43 is deformed by the impact force.
Absorbs shock loads. When the cam follower 3 further approaches the cam 4, a portion of the plate cam 43 projecting from the plate cam 41 is pressed by the cam follower 3, and enters the concave portion 7 of the cam 41 as shown in FIG. 3B. Thereby, the cam follower 3 comes into contact with the side surface 41 a of the plate cam 41. The shape of the side surface 41 a of the plate cam 41 is the same as that of the conventional cam 1.
4, the angle of the claw opening of the gripper 11 is fixed by the plate cam 41. By providing the concave portion 7 in this manner, the plate cam 41 and the cam follower 3 can be brought into contact with each other without the end of the plate cam 43 being disturbed, and the cam 4 that has entered the escape 7
3, the vibration control effect of the plate cam 41 is further achieved.

As described above, in the present embodiment, the cam 4 as the guide has the side surface 41a as the guided member contact surface. The cam follower 3, which is the guided member, is located away from the cam 4, and when the position relative to the cam 4 changes relatively, the cam follower 3 contacts the side surface 41a of the cam 4 and performs a predetermined operation along the side surface 41a. . In addition, before contacting the side surface 41 a, the contact always contacts the side surface of the plate cam 43. Therefore, the impact of the cam follower 3 is not directly transmitted to the non-deformed member that guides the cam follower 3 by the elastic force of the plate cam 43.

In this embodiment, the recess 7 is provided on any surface inside the plate cam 41. However, as shown in FIG. 4A, the recess 7 may be provided on only one side. 7 may not be provided. Although the concave portion 7 is provided continuously on the inner surface of the plate cam 41 over the entire periphery of the portion where the plate cam 43 protrudes, the concave portion 7 is provided not on the entire periphery but on a part thereof. Or may be provided discontinuously.

In this embodiment, both sides of the plate cam 43 made of an elastic member are sandwiched between the plate cams 41. However, as shown in FIG. You may make it pinch. Further, FIG.
As shown in C, the plate cams 41 and the plate cams 43 may be alternately arranged. That is, the plate cam 41 and the plate cam 4
The method of combination 3 is not particularly limited to the embodiment. Also in this case, as shown in FIG. 3 and FIG. 4A, a relief portion may be provided in part or all.

In this embodiment, the cam follower 3
Although the cam 41 is provided with the elastic member for absorbing the shock of the above, the cam follower 3 may be provided. Either one of them has an absorbing portion that deforms when both come into contact and absorbs an impact, and a non-deformable portion that causes the cam follower 3 to perform a predetermined operation along the shape of the contact surface with the cam 4 after absorbing the impact. It should just be.

In this embodiment, the plate cam, which is such a plate-like member, is placed in the thickness direction (arrow α) shown in FIG.
2A), and the plate cam 43 is formed so as to protrude from the plate cam 41 as shown in FIG. 2A. Thus, with a simple configuration, it is possible to reduce the impact of a collision and make contact with a high load.

Further, as shown in FIG. 2, the plate cam 43 protrudes only at a portion where an impact is required. However, the present invention is not limited to this, and the plate cam 43 may protrude over the entire circumference. Good.

In the above-described embodiment, the case where the cam serving as the guide is constituted by three plate cams has been described as an example. In short, the cam is used to absorb the shock when the guided body collides with the guide. The member protrudes from a non-deformed abutment surface serving as a guide for the guide, and after a collision, the absorbing member is deformed by a pressing force by which the guided body is pressed against the guide body, and the absorbing member is brought into contact with the abutment surface. Any object may be used as long as the object can be brought into contact with the object. For example, as shown in FIGS. 5A and 5B, the recesses 51a and 51
5C, a ring-shaped rubber 55 having a thickness γ2 thicker than the concave portions 51a and 51b is fitted as shown in FIG. 5C, and the rubber 55 slightly protrudes from the side surface 51c of the cam follower 51. You may do so. Also in this case, a relief portion may be provided when the rubber 55 is deformed. Further, the cam serving as the guide may have such a structure.

In this embodiment, as the elastic member,
Although the plate cam 43 is made of natural rubber, any other material, such as butyl rubber or urethane rubber, may be used as long as it is deformed by impact and has elasticity enough to return to the original state. .

Further, by forming the plate cam 41 from a damping material, a higher damping effect can be obtained.

The present invention can be used for a cam device which is subjected to a high load by forming a high-strength material and an elastic material in a laminated structure in a direction perpendicular to the contact surface of the cam follower, and is effective in reducing noise. .

Since the cam follower hits the elastic material cam first and then hits the high-strength material cam, the elastic material can absorb the collision energy, and the durability of the cam and cam follower is improved.

The present invention can be used under a high load, and is effective in reducing noise generation, vibration and load fluctuation. In other words, obstacles to the machine itself caused by the load fluctuation by the cam device, which had been a problem in the past, gear tooth contact caused by the load fluctuation at the time of collision,
Obstacles such as printing failure due to uneven rotation can be eliminated.

Further, the weight can be further reduced as compared with a conventional cam using only high-strength material.

In this embodiment, the case where the present invention is applied to a paper feed mechanism of a printing apparatus has been described. However, when the second member relatively moves with respect to the first member, the two collide with each other. The second member can be similarly applied to the case where the second member moves while being guided by the first member. In particular, accurate guidance can be provided when the load of the guidance movement is large.

[Brief description of the drawings]

FIG. 1 is a view showing an entire configuration of a guide mechanism according to the present invention.

FIG. 2 is a view showing a detailed structure of a cam 4;

FIG. 3 is a view showing a deformation of the plate cam 43;

FIG. 4 is a diagram showing another embodiment.

FIG. 5 is a diagram showing another embodiment.

FIG. 6 is a view showing a conventional guide mechanism.

[Explanation of symbols]

 4 ··· Cam 3 ··· Cam follower 41 ··· Plate cam 42 ··· Plate cam 43 ··· Plate cam 51 ··· Cam 53 ··· Rubber

Claims (4)

[Claims] 1. A guide body having a guided body contact surface with which a guided body abuts, and causing the guided body to perform a predetermined movement along the guided body abutting surface. A non-deformable portion that can be brought into contact with the guided body and causes the guided body to perform a predetermined movement along the guided body contact surface; 2) protruding toward the guided body side from the non-deformed portion Is formed on the guided body contact surface, and a deformable portion is formed on the guided body contact surface so that the guided body and the non-deformed portion can be deformed when the non-deformed portion comes into contact with the guided body. Guide body characterized. 2. The guide according to claim 1, wherein: 1) said deformable portion is formed of an elastic plate-like member; and 2) said non-deformable portion is a non-deformable plate-like member slightly smaller than said elastic plate-like member. 3) a side surface of the non-deformable plate-shaped member is the guided member contact surface. 3. The guide body according to claim 2, wherein the elastic plate-shaped member is provided on a surface of the non-deformable guide portion on which the guided body abuts, and on a surface facing the elastic plate-shaped member. A relief part that allows a part of it to enter when deformed is provided. 4. A guide body having a guided body contact surface, wherein the guided body is located away from the guide body, and when the position of the guided body relatively changes, the guided body abuts. A guided body that contacts a contact surface and performs a predetermined operation along the guided body contact surface, wherein the guided body or the guided body is guided by the guided body. An absorbing portion that deforms when it comes into contact with the body contact surface and absorbs an impact, and a non-deformed portion that causes the guided body to perform a predetermined operation along the guided body contact surface after the deformation, Guide mechanism characterized by the following.