JPS6012162Y2 - timing cam device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a timing cam device that generates timing signals necessary for sequence control.

In sequence control, timing cam devices for generating timing signals for instructing the start and end of each operation have a conventional structure.

In Fig. 1, 1 is a shaft rotated at a constant speed by a motor, 2 is a disc-shaped timing cam, 2a is a mounting boss fixed at the center integrally with the timing cam, and 2b is a shaft that connects boss 2a to the shaft. This is a tap that fixes it to 1.

Each timing cam 2 is closely stacked and fixed on the shaft 1, and by adding the thickness 1 of each timing cam, each timing cam 2 is fixed at a fixed position from a reference position.

3 is a timing slit cut out at a predetermined width at a predetermined position on the periphery of the timing cam 2 in accordance with the generation timing and length of the timing signal; 4 is a timing slit fixedly installed so as to sandwich the periphery of the timing cam 2; 3 is a photointerrupter that optically detects the presence or absence of the photointerrupter, and 4a is a detection gap of the photointerrupter.

In this configuration, when the shaft 1 rotates at a constant speed, the peripheral edge of the timing cam 2 integrated therewith rotates while passing through the detection gap 4a of each photointerrupter 4, and each photointerrupter 4 detects the presence or absence of the notch 3. It detects and generates an ON output or OFF output timing signal.

Through such an operation, a desired timing signal can be obtained from each photointerrupter 4 provided corresponding to each step of sequence control.

Therefore, in order to adjust the timing signal generation timing in this conventional timing cam device, as shown in Fig. 2,
This is done by loosening the taps 2b for fixing the boss 2a integrated with the timing cam to the shaft 1, rotating each timing cam 2 in the circumferential direction of the shaft, and tightening the taps 2b again.

However, during this work, gaps are created between the timing cams 2, which tend to shift in the axial direction of the shaft 1.

Therefore, in this work, it is necessary to adjust the mounting angle of the timing slit 3 while being careful not to displace the peripheral edge of the timing cam from the center of the narrow gap 4a of the photo interrupter 4, resulting in extremely poor workability. There were drawbacks.

Furthermore, as a solution to the difficulty in adjusting the timing cam 2, there is a structure in which the timing cam 5 is mounted in pressure contact with a fixed block 6 fixed to the shaft 1, as shown in FIG. .

In this structure, fixed blocks 6 are fixed to the shaft 1 at predetermined intervals, and each timing cam 5 is elastically held using a compression spring 7 or a wave washer (not shown).

According to this device, each timing cam 5 is pressed against a fixed block 6 by a compression spring 7 or a wave washer, and is always held at a constant position, and does not shift in the axial direction of the shaft 1.

Therefore, the peripheral edge of the timing cam 5 can always be positioned at the center of the opening of the photointerrupter 4.

The angle of the timing cam can be adjusted by forcibly rotating it against the elastic force of the compression spring 7, as shown in FIG.

However, with this mounting method, the timing cam 5
is simply fixed by elastic force, so if the shaft 1 suddenly starts or stops rotating, the position will shift in the circumferential direction due to the inertia of the timing cam 5 itself, reducing the accuracy of the timing signal. There were drawbacks.

This invention has been developed to improve and eliminate the above-mentioned conventional drawbacks, namely, to provide a device that can easily and reliably adjust the angle of the timing cam in the circumferential direction and that does not cause any deviation of the above-mentioned angle during use. That is.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the structure of the present invention shown in the drawings will be described in detail.

FIG. 5 shows a first embodiment of the present invention, in which a timing cam 9 is attached to fixed blocks 6.8 fixed to the shaft 1 at predetermined intervals by fitting holes and protrusions and notches and protrusions. This ensures positional regulation in the circumferential direction.

More specifically, referring to FIG. 6, an adjustment plate 10 is provided between the timing cam 9 and the fixed block 8, the periphery of which is held by an optical sensor such as the photointerrupter 4 (see FIG. 5). Then, the timing cam 9 is pressed toward the fixed block 8 by the pressing force of the compression spring 11 and fixed.

The fixed block 8 is provided with protruding means 12, the structure of which is shown in FIGS. 7 and 8.

That is, a cavity 13 is formed at a predetermined location of the fixed block 8, an opening 13a communicating with the cavity 13 is formed on the outer peripheral surface of the block 8, and a cavity is formed on the side surface of the block 8 that joins with the adjustment plate 10. The openings 13b that communicate with each other are the main features.

Inside this cavity 13 is a projection member 16 having an operating lever 14 and a projection 15, and a compression spring 17 that presses the projection member 16 in the direction in which the projection 15 projects from the block 8 (that is, toward the left in the drawing). Insert.

The operating lever 14 and the protruding portion 15 of the protruding member 16 protrude from the openings 13a and 13b of the hollow portion 13 to the outside of the fixed block 8, and by operating the operating lever 14, the protruding portion 15 is moved in the axial direction on the side surface of the block 8. Protruding in and out.

That is, in the normal state, the projection 15 protrudes from the side surface of the block 8 due to the pressing force of the spring 17, but when the operating lever 14 is moved to the right in the drawing against the pressing force of the spring 17, the projection 15 protrudes accordingly. The section 15 retreats into the block 8.

On the side of the adjustment plate 10 in contact with the fixed block 8,
Holes 18 are bored at a constant pitch within the circumference including the position of the protrusion 15 of the protrusion means 12.

The depth of this hole 18 is deeper than the protrusion length m of the protrusion 15 (see FIG. 8), and the thickness of the adjustment plate 10 is of course greater than the protrusion length 9.

Furthermore, the diameter of the hole 1B is a size that allows the projection 15 to just fit therein.

In addition, notches 1 are formed at a constant pitch on the periphery of the adjustment plate 10.
9 is the setting.

A protrusion 20 is provided on the side surface of the timing cam 9 in contact with the adjustment plate 10 within the circumference where the notch 19 is located, and the diameter of this protrusion 20 is of a size that just fits into the notch 19.

Note that the pitch angles of the holes 18 and notches 19 provided in the adjustment plate 10 are, for example, θ□=11 for reasons described later.
°, θ2=10°.

According to the bark, any one of the holes 18 of the adjustment plate 10 is fitted into the projection 15 of the fixed block 8, and the projection 20 of the timing cam 9 is fitted into any one of the notches 19 of the adjustment plate 10. If the timing cam 9 is elastically pressed toward the fixed block 8 by the elastic force of the compression spring 11, the timing slit 3 of the timing cam 9 is fixed at a fixed angle to the fixed block 8.

To adjust the angle of the timing slit 3 with respect to the fixed block 8, first, the protrusion 15 of the protrusion means 12 of the fixed block 8 is retracted into the fixed block 8 by the retracting operation of the lever 14, and After releasing the fitting with the protrusion 15 and thereby breaking the fixed relationship between the adjustment plate 10 and the fixed block 8, rotate the adjustment plate 10 by a desired angle (θ1 × n), and then turn the lever 14. When released, the return pressure of the spring 17 causes the protrusion 15 to
protrudes and fits into the hole 18, so that the adjustment plate 10 and the fixing block 8 are joined and fixed.

Next, the timing cam 9 is moved in the axial direction (to the left in FIGS. 5 and 6) against the pressing force of the compression spring 11 to release the engagement between the protrusion 20 and the notch 19, thereby adjusting the timing. After releasing the fixed relationship between the cam 9 and the adjustment plate 10, the timing cam 9 is rotated by a desired angle (θ2×n2), and the protrusion 20 and the notch 19 are fitted together by the elastic force of the compression spring 11. The timing cam 9 and adjustment plate 10 are joined and fixed.

Through the above operations, the angular position of the timing slit 3 of the timing cam 9 with respect to the fixed block 8 is newly set.

The timing cam 9 and the adjustment plate 10 can be rotated in both directions, and the angle can be adjusted not only by moving both plates but also by moving only one plate.

For example, as mentioned above, the pitch angle θ1 of the hole 18 is 110,
When the pitch angle θ2 of the notch 19 is 10°, in order to adjust the cam position by 23°, first move the relationship between the hole 18 and the protrusion 15 by 3 pitches, and then adjust the relationship between the protrusion 20 and the notch 19 by 3 pitches. It is sufficient to shift the relationship by one pitch in the opposite direction to the above-mentioned moving direction.

In the above description, first, the relationship between the hole 18 and the protrusion 15 was determined, and then the relationship between the protrusion 20 and the notch 19 was determined, but the adjustment may of course be performed in the reverse order.

Moreover, the holes 18 and notches 19 provided in the adjustment plate 10 are
Although it may not be possible to equally divide the entire 360° circumference, it is okay to have some parts with irregular pitch angles.

FIG. 9 shows a second embodiment of the present invention, in which the protrusion 20 of the timing cam 9 in the first embodiment is modified to eliminate the need for the compression spring 11. The axial dimension of the fixed block 8 is changed accordingly.

Therefore, the same reference numerals as in the first embodiment indicate the same members.

In this embodiment, the protruding means 2 of the timing cam 23
4 is movable (see Figures 11 and 12).

That is, the protrusion means 24 is composed of a spring member 27 and a protrusion member 25 fixed to the tip thereof, and the protrusion means 24 is attached to a predetermined position on the side surface of the timing cam 23 that is not in contact with the adjustment plate 10 using an appropriate mounting member. 28, and the protruding member 25 protrudes to the opposite side (that is, the side in contact with the adjustment plate 10) through a through hole 26 formed through the timing cam 23.

This protrusion member 25 is made of bark so as to satisfy the same conditions as the protrusion 20 of the first embodiment.

In addition, the dimensions of the through hole 26 are as shown in FIG.
5 to be of sufficient size to release the engagement with the notch 19 of the adjustment plate 10.

Since the fixed block 22 eliminates the need for the suspension ring 11 of the first embodiment, the fixed block 22 is sized to maintain the interval between each timing cam 23 at a predetermined distance.

Since the method for adjusting the position between the fixed block 22 and the adjustment plate 1o is the same as in the first embodiment, only the method for adjusting the position between the adjustment plate 10 and the timing cam 23 will be described.

First, as shown in FIG. 12, the protrusion member 2 of the protrusion means 24 is
5 in the direction of arrow a against the spring force of the spring member 27 to release the engagement between the protruding member 25 and the notch 19, thereby releasing the fixed relationship between the timing cam 23 and the adjustment plate 10. , the timing cam 23 is set at a desired angle (θ
After the timing cam 23 and the adjustment plate 10 are rotated by 2xn'2), the return elasticity of the spring member 27 causes the projection member 25 and the notch 19 to fit together, thereby joining and fixing the timing cam 23 and the adjustment plate 10.

Although the configuration of the present invention has been described above with reference to the embodiment shown in the drawings, the timing cam device according to the present invention is not limited to the above-mentioned embodiment, and various changes can be made without departing from the technical idea of the present invention. .

For example, the cutout of the adjustment plate may also include a hole such as a through hole.

As explained above, the present invention involves fixing one or more optical sensors in fixed positions so as to sandwich the periphery of one or more timing cams attached to a rotating shaft, and using this optical sensor, In a device that extracts a timing signal by detecting the presence or absence of a timing slit, a timing cam, an adjustment plate, and a fixed block that defines the axial position on the shaft are used as a pair, and the block is , comprising protrusion means that protrudes and retracts at the joint surface with the adjustment plate, and the adjustment plate is bored at a constant pitch angle on a circumference corresponding to the projection means on the joint surface with the block. The timing cam is provided with a plurality of holes that fit with the protruding means, and a plurality of notches provided around the circumference at a constant pitch angle different from the pitch angle of the holes, and the timing cam has A protruding means that fits into the notch is provided at a circumferential position corresponding to the notch on the joint surface with the plate, thereby adjusting the relative angle in the circumferential direction of the fixed block, adjustment plate, and timing cam. By combining, the rotation direction angle of the timing cam with respect to the fixed block can be set arbitrarily.
Compared to conventional devices of this type, the timing cam's circumferential angle can be adjusted much more easily and reliably, and there is no deviation in the angle during use, making it extremely useful.

[Brief explanation of drawings]

Fig. 1 is a front view showing a conventional example of a timing cam device, Fig. 2 is a perspective view showing its angle adjustment method, Fig. 3 is a front view showing another conventional example of a timing cam device, and Fig. 4 is a front view showing a conventional example of a timing cam device. Fig. 5 is a front view showing the first embodiment of this invention, Fig. 6 is an exploded perspective view showing the assembly procedure, and Fig. 7 is the first embodiment. 8 is a sectional view taken along the line A-A in FIG. 7, FIG. 9 is a front view showing the second embodiment of this invention, and FIG. 10 is an exploded view showing the assembly procedure. A perspective view, FIG. 11 is a partial sectional view illustrating the bonding and fixing relationship between the timing cam and the adjustment plate of the second embodiment, and FIG. 12 is a diagram illustrating the adjustment method thereof. 1...Shaft, 3...Timing slit, 4...Photo ink club, 6, 8,
21, 22... Fixed block, 9, 23...
...Timing cam, 10...Adjustment plate, 11...Compression spring, 12...
Projection means, 18... Hole, 19... Notch, 20... Projection, 24... Projection means.

Claims (1)

[Scope of utility model registration request] One or more optical sensors are fixed at fixed positions so as to sandwich the periphery of one or more timing cams attached to the rotating shaft, and the optical sensor detects the presence or absence of a timing slit provided on the periphery of the timing cam. In a device adapted to take out a timing signal, a timing cam, an adjustment plate, and a fixed block that defines the axial position on the shaft are separated, and the block is fixed at the joint surface with the adjustment plate. A plurality of holes are provided with protrusion means that protrude and retract, and the adjustment plate is fitted with the protrusion means bored at a constant pitch angle on a circumference corresponding to the protrusion means on the joint surface with the block. and a plurality of notches provided around the circumference at a constant pitch angle different from the pitch angle of the holes, and the timing cam corresponds to the notches on the joint surface with the adjustment plate. A protruding means is provided at a circumferential position to fit into the notch, so that the rotational direction of the timing cam with respect to the fixed block is determined by the relative combination of the fixed block, adjustment plate, and timing cam in the circumferential angle. A timing cam device characterized by allowing the angle to be set arbitrarily.