JPS5958260A - Grooved cam - Google Patents

Abstract

PURPOSE:To secure the motion of a cam roller on a cam changeable of the profile, by providing a groove on the peripheral surface of the cam to enable the cam roller to follow up the profile of the cam even in its rapid motion. CONSTITUTION:A first forming member consists of a first inner wall 8 and a first outer wall 10. A second forming member consists of a second inner wall 9 and a second outer wall 11. The first forming member is secured on the second forming member in such a manner that the first forming member is turned within a prescribed range of angle centering a cam shaft 1. Inner cam surfaces 4, 4' are separated from outer cam surfaces 7, 7' by a distance equal to the diameter of a cam roller, along all the cam surfaces. The first and the second forming members are shaped so as to be coincident with each other so that an outer arc- shaped surface 5 most distant from the center of the cam shaft 1 and an inner arc-shaped surface 6 least distant from the center of the cam shaft extend without discontinuity.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a grooved cam whose cam shape or displacement curve can be changed.

Conventionally, various crank and cam mechanisms have been used to convert rotational motion obtained from a drive source such as a motor or engine into reciprocating motion. Among these, various cam mechanisms have been used to obtain intermittent reciprocating motion. For example, as shown in FIG. 1, a thermoplastic synthetic resin band-shaped film Fi is formed into a cylindrical shape by a cylindrical body forming apparatus A, and a viscous object such as sausage, miso, or yolk, or a string of lintel is placed inside the cylindrical body. Charges consisting of objects that fit in a continuum like moe but can be easily broken, powders such as beans, shichimi, and wheat flour, liquids, and mixtures of the above objects are automatically fed by the charge supply device B. After filling, the cylindrical body is filled with the charge and moved downward by the feeding device C, and the cylindrical body is squeezed at predetermined intervals to ensure the complete sealing operation as described below, and depending on the type of the charge. In an automatic filling and packaging machine, a cylindrical packaging body is assembled with a sealing device E, in which the bottom holder forms a part that plays a central role, and this squeezed part is sealed by wire clips, heat fusion, etc.
A squeezing device that squeezes a cylindrical body at predetermined intervals to create an unoccupied part of the contents is also used, as shown in Fig. A cam mechanism is used that is fully assembled and attached to the camshaft, and the two plate cams can also be used when changing the feeding speed of the cylindrical body in order to change the length of the package. By changing the angle between the fully illustrated state and state 1 where the two plate cams overlap, the cam shape is completely changed, the ironing time of the cylindrical body is completely changed, and the length of the ironing part is kept constant. Ta.

However, in recent years, there has been a growing demand for higher speeds for automatic filling and packaging machines, but if the conventional mechanism was operated at high speed, the cam roller would not be able to fully follow the cam surface, resulting in increased noise and vibration. However, it also had many problems such as a short lifespan and an inability to operate economically, making it impossible to put it into practical use. Therefore, we tried to use a grooved cam instead of the cam mechanism shown in the figure in order to make the cam roller more reliable, but since the cam shape cannot be changed with a general grooved cam like the conventional cam mechanism shown in the figure, the cylinder If the feeding speed of the cylindrical body is increased, the length of the cylindrical body will become longer and there will be a lot of waste, and conversely, if the cylindrical body feeding speed is decreased, the cylindrical body will have a shortened length, making it impossible to securely seal the packaging, resulting in a waste of money. I was invited.

In order to eliminate such problems, the present inventors conducted various studies to develop a grooved cam whose cam shape can be changed in the same way as the conventionally used cam mechanism, and as a result, the grooved cam according to the present invention was completed. It is.

That is, in the present invention, the inner and outer cam surfaces that are farthest and nearest from the center of the camshaft form concentric arcuate surfaces centered on the center of the camshaft, and A grooved cam having a shape in which the inner and outer cam surfaces between the inner and outer cam surfaces that are furthest from the outer cam surface are connected by curved surfaces that gradually increase the distance from the center of the cam shaft, The first forming material, which is made up of each of the wall forming materials listed below, and which is made up of the first inner wall forming material and the first outer wall forming material, is opposed to the second forming material which is made up of the second inner wall forming material and the second outer wall forming material. The present invention provides a grooved cam which is characterized in that the shape of the cam can be completely changed by being fixed in a rotated state within a certain angle range about the center of the camshaft.

b) A first inner wall forming material that has at least the furthest and nearest inner arcuate surfaces and one inner curved surface that fully connects the inward arcuate surface, and forms a part of the inner cam surface; and a second inner wall that has at least a part of the other inner curved surface that connects the nearest inner curved surface of the mountain and a part of the furthest inner curved surface that connects to the inner curved surface, and forms the entire remainder of the inner cam surface. forming material, ...) an outer curved surface that completely forms the outer cam surface corresponding to the inner curved surface of the first inner wall forming material, and a first
a first outer wall forming member that is integral with the first inner wall forming member and has at least a part of an outer circular arc surface forming an outer cam surface corresponding to the nearest inner arc surface of the inner wall forming member;
An outer curved surface forming an outer cam surface corresponding to the inner curved surface of the second inner wall forming material, and an outer curved surface forming an outer cam surface corresponding to the farthest and nearest inner circular arc surfaces of the inner cam surface and connected to the outer cam surface of the first outer wall forming material. A second outer wall forming member, which has an outer arcuate surface and metal, and is integrally formed with the second inner wall forming member.

Hereinafter, the present invention will be further explained based on the implementation side sound of the grooved cam according to the present invention shown in the drawings.

FIG. 6 is a front view showing an embodiment of the grooved cam according to the present invention, which is installed so that the length of the cam surface is the shortest and the distance from the center of the camshaft is the shortest. 6 is a front view showing the grooved cam shown in FIG. 6 installed so that the length of the cam surface at the farthest distance from the center of the camshaft is the longest; FIG. 5 is a front view showing the grooved cam shown in FIG. FIG. 3 is a perspective view showing the main components of the cam.

In the drawings, 1 is a camshaft on which the grooved cam according to the present invention is mounted;
2 is an inner arcuate surface which is the farthest distance from the center of the camshaft 1 among the inner cam surfaces; 6 is an inner arcuate surface which is the shortest distance from the center of the camshaft 1 among the inner cam surfaces; 4 and 4 '' is an inner curved surface connected by a curved surface such that the distance from the center of the sound-opening camshaft 1 gradually increases from the inner arc surface 6 that is the most recent to the inner arc surface 21 that is the farthest, and 5 is the outer curved surface. Among the cam surfaces, the outer arcuate surface is the furthest distance from the center of the cam shaft 1;
6 is the outer arcuate surface of the outer cam surface that is the closest to the center of the camshaft 1, and 7 and 7' are the outer arcuate surfaces 51 that are the furthest from the nearest outer arcuate surface 6. The outer curved surfaces are connected by curved surfaces whose distances from the center of 1 gradually increase. The outer curved surfaces 7 and 7' are both on a concentric circle centered on the center of the camshaft 1, and the outer curved surfaces 7 and 7' are at the same distance from the corresponding inner arc surfaces 4 and 4' as the diameter of the cam roller (not shown). They form a shape that is separated by a certain amount. Reference numeral 8 denotes a first inner wall forming member which has at least the farthest and nearest inner circular arc surfaces 2 and 6 and one inner curved surface 4 and forms a part of the inner cam surface; 9 is the first inner wall forming member; The inner surface has at least the other inner curved surface 4' that is fully connected to the furthest and nearest inner arcuate surfaces 2 and 6, and a part of the furthest inner arcuate surface B that is connected to this inner curved surface 4'. This is the second inner wall forming material that completely forms the remainder of the cam surface. 10 is one outer curved surface 7 and the nearest outer circular arc surface 6 connected to this outer curved surface 7;
This is a first outer wall forming material having at least a part of the first inner wall forming material 8, and having an entire outer cam surface formed on the bottom corresponding to the first inner wall forming material 8. 11 is the farthest and nearest outer circular arc surface 5
, 6 and the other outer curved surface 7', and forms an outer cam surface corresponding to the second inner wall forming member 9. In the embodiment shown in the drawings, the first member shown in the upper part of the stone in FIG. 5 is provided with the second outer wall forming material 11, and the second member shown in the center part of FIG. 1
A second inner wall forming member 9 is provided on the sixth member shown in the lower left part of FIG. By attaching the bolt 15 to the bolt hole 14 provided in the first member through the through hole 12 provided in the sixth member and the elongated hole 16 provided in the second member, and tightening the bolt 15, the third member is attached. As shown in the figure or FIG. The first member and the third member constitute the entire second forming member. In the embodiment shown in the drawings, a keyway is provided in the second member and the second member is fixed to the camshaft 1 with a key, but the second member is not limited to the second member and is fixed to the camshaft 1. It may be a member or a sixth member, and it may also be fixed with a bolt instead of a key. As described above, the grooved cam according to the present invention is a simple packing whose main members are a first forming member and a second forming member.

In the grooved cam according to the present invention having such a configuration, in the first forming member, the inner circular arc surfaces 2 and 6 which are the farthest and nearest
and a first inner wall forming member 8 forming a part of the inner cam surface including at least the whole of one inner side surface 4 connecting the two diagonal arc surfaces 2 and 3, and an outer side corresponding to the inner curved surface 4 of the first inner wall forming member 8. It has at least an outer curved surface 7 that forms a cam surface and an outer arcuate surface 6 that is connected to the outer curved surface 7 and that forms part and all of the outer cam surface that corresponds to the inner arcuate surface B that is closest to the first inner wall forming material 8. Since the first outer wall forming material 10 is formed integrally with the first outer wall forming material 10, the distance between the inner curved surface 4 and the outer curved surface 7 on the inner cam surface is the same distance as the diameter of the cam roller. In the material, the other inner curved surface 4' that connects the farthest and nearest inward circular arc surfaces 2 and 6 of the inner cam surface and a part of the furthest inner circular arc surface 2 that connects to the inner surface 1fi4' a second inner wall forming member 9 that has at least the following and forms the entire remainder of the inner cam surface;
An outwardly curved surface 7' forming an outer cam surface corresponding to the inner surface 4' of the curve, and an outer curved surface 7' having a shape corresponding to the inner circular arc surface 2.3 of the inner cam surface and connected to the outer cam surface of the first outer wall forming member 10. Since the second outer wall forming member 11 having the outer circular arc surface 5.6 is integrated, even if the entire second forming member is rotated about the camshaft 1 with respect to the first forming member, the inner cam surface and the outer wall forming member 11 are integrally formed. The distance from the cam surface is the same as the diameter of the cam roller, and the sixth
The cam shape can be freely changed from the state shown in the figure to the state 1 shown in FIG. Furthermore, in the first outer wall forming material 10 and the second outer wall forming material 11 that form the entire outer cam surface, the second outer wall forming material 11 is rotated relative to the first outer wall forming material 10 around the cam shaft 1. Even if the distance from the center of the camshaft 1 is the farthest, the outer arcuate surface 5 and the outer arcuate surface B, which is the closest, are arranged so that they overlap each other when viewed from the front, as shown in the actual flow example. This is more preferable because it prevents impact and uneven wear on the cam roller.

As detailed above, the grooved cam according to the present invention functions as a positive cam without the phenomenon of the cam roller being displaced from the cam surface and moving.Although it is a grooved cam with a biased function, it can meet its intended use. The cam shape, that is, the displacement curve, can be changed by changing the cam shape, that is, the displacement curve. This makes it possible to increase the speed of various machines that could not be increased in speed because the cam roller could not follow the cam surface when the cam, which changes the rotational motion of the shaft to intermittent reciprocating motion, was rotated at high speed.
Its industrial value is enormous.

[Brief explanation of the drawing]

Figure 1 is a front view of an automatic filling and packaging machine shown as an example of a machine using a cam mechanism, Figure 2 is a front view of an example of a conventional cam whose cam shape can be changed, and Figure 6. FIG. 4 is a front view showing an embodiment of the grooved cam according to the present invention, which is installed so that the distance from the center of the camshaft is optimal and the length of the cam surface is the shortest. FIG. 4 is shown in FIG. 6. 5 is a front view showing a grooved cam installed so that the length of the cam surface at the farthest distance from the center of the camshaft is the longest;
FIG. 7 is a perspective view showing the main components of the grooved cam shown in FIG. 6; A... Cylindrical body forming device B... Charge supply device C... Feeding device 6. Straining device E...Sealing device F...Band-shaped film sheet/cam shaft 2...Furthest inner circular arc surface 6...Latest inner arc surface 4.4'...Inner curved surface 5...Farthest Outer arc surface 6...Latest outer arc surface 7.7'...Outer curved surface 8...First inner wall forming material 9...Second inner wall forming material 10...First outer wall forming material 11...Second outer wall Forming material 12...Through hole 16...Long hole 14...Bolt hole 15...Bolt Figure 1 Figure 2 Figure 3rIi

Claims (1)

[Claims] 1. The inner and outer cam surfaces that are farthest and nearest from the center of the camshaft (1) form concentric arcuate surfaces with the entire center of the camshaft (1) as the center. The inner and outer cam surfaces between the nearest inner and outer cam surfaces and the furthest inner and outer cam surfaces 1 are connected by curved surfaces whose distances from the center of the cam shaft (1) gradually increase. The grooved cam is formed of wall forming materials listed below, and the first forming material consisting of a first inner wall forming material (8) and a first outer wall forming material (10) forms a second inner wall. Material (9) and second outer wall forming material (11)
A grooved cam characterized in that the cam shape can be completely changed by being fixed in a state of rotation within a certain angle range about the center of the cam shaft (1) with respect to a second forming member consisting of the following. Farthest and nearest inner arc surfaces (2) and (6)
and a part of the inner curved surface (4) connecting the cylinder inner circular arc surfaces (2) and (6), a first inner wall forming material (8) forming a part of the inner cam surface entirely; ) The other inner curved surface (4') connecting the furthest and nearest inner arcuate surfaces (2) and (3), and the inner curved surface (4')
A second inner wall forming material [9], which has at least a part of the furthest inner arcuate surface (2) connected to the cam surface and forms the remainder of the inner cam surface, c) a first inner wall forming material ( The outer curved surface (7) that completely forms the outer cam surface corresponding to the inner curved surface (4) of [8] and the outer curved surface (
7] and has at least a part of the outer arcuate surface (6) forming the outer cam surface purple corresponding to 3J, and the inner arcuate surface (6) that is closest to the first inner wall forming material (8). a first outer wall forming material (10) that is integral with the first inner wall forming material (8);
2) The outer curved surface (7) forming the outer cam surface corresponding to the inner curved surface (4') of the second inner wall forming member (9), and the inner circular arc surface (2) which is the furthest and nearest of the inner cam surface and Corresponding to (3), it has outer arcuate surfaces (5) and (6) shaped to be connected to the outer cam surface of the first outer wall forming member (10),
and a second outer wall forming material (11) that is integral with the second inner wall forming material (9).