JPH0488244A - Revolution transmission mechanism - Google Patents

Abstract

PURPOSE:To enable the speed of one member to follow easily the speed of the other member by installing a nonequal speed revolution transmission mechanism for transmitting the revolution on a prime mover body side to a driven body side, speed change mechanism for the number of revolution on a drive body side, and a phase adjusting mechanism on the driven body side. CONSTITUTION:A speed change mechanism 17 is incorporated in a variable speed servomotor as driving source 3. In a phase adjusting mechanism 18, an AC servomotor 19 is installed on a casing 6, and a turn adjusting shaft 20 is journaled in rotatable manner on the casing 6, and the main shaft 21 of the AC servomotor 19 and the turn adjusting shaft 20 are connected by a coupling 22, and a gear part 23 is formed on the outer periphery of a holding body 11, and a gear part 24 is formed on the turn adjusting shaft 20. In the state where the AC servomotor 19 is in stop and the turn adjusting shaft 20 of the phase adjusting mechanism 18 is fixed in a position a prime mover body 1 is revolved by a driving source 3, and then an input shaft 7 revolves, and a transmission shaft 10 revolves through elliptical gears 5 and 5, and three gears 13 are revolved by a gear part 15, and a gear 14 is revolved through a rotary shaft 12, and an output shaft 9 is revolved by the meshing between the gear 14 and a gear part 16, and a driven body 2 is revolved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a rotational transmission mechanism that converts uniform rotation of a driving body into inconstant rotation and transmits the same to a driven body.

[Prior Art] Generally, in rotary transmission mechanisms used in various mechanical devices such as article conveyance devices and film supply devices, drive transmission is performed using pulse motors, stepping motors, etc. as one of the drive transmission means. I try to do that.

For example, in a pillow type film packaging machine, as shown in Fig. 6.7, the sealing position IS of the heater H with respect to the film F changes as the length size and content of the packaged product W changes, that is, the seal pitch P changes, the transfer speed V of the film F changes accordingly, and the circumferential speed V of the heater H during heat sealing follows this transfer speed V.
, it is necessary to change.

Changing one speed V8 to follow the other speed (V7) in this manner is a problem that frequently occurs not only in the heat sealing work in the film packaging machine but also in other works.

[Problem to be solved by the invention] However, in the case of the above conventional structure, for example, the above-mentioned
The peripheral speed V of the heater H is changed by a variable speed motor, such as a pulse motor or a stepping motor, so that the peripheral speed 3 of the heater H follows the film transport speed V#, but due to the characteristics of the motor, the rotation speed There is a limit to the improvement, and as a result, the transfer speed V8 of the film F is restricted, which has the disadvantage that it may not be suitable for increasing the speed of packaging operations.

[Means for Solving the Problems] The present invention aims to solve these disadvantages, and its gist is to transmit the rotation of the driving body to the driven body with periodic changes in angular velocity. a rotational transmission mechanism;
The rotary transmission mechanism is characterized in that it includes a transmission mechanism that can vary the rotational speed of the driving body, and a phase adjustment mechanism that can vary the rotational phase of the driven body.

[Function] The rotation on the driving body side is transmitted to the driven body side with periodic changes in angular velocity by the inconstant rotation transmission mechanism, and the rotation speed and period on the driving body side are changed by the transmission mechanism and transmitted to the driven body side. , the rotational phase of the driven body is changed by the phase adjustment mechanism.

[Embodiment] Figures 1 to 5 show an embodiment of the present invention, in which violet is a driving body, 2 is a driven body, and driving body 1 is rotated by a drive source 3, in this case an AC variable speed servo motor. The driven body 2 is transmitted and rotated.

Reference numeral 4 denotes an inconstant rotational transmission mechanism, in this case consisting of a set of elliptical gears 5.5, and an AC drive source 3 in a casing 6.
Install the variable speed servo motor and connect the input shaft 7 to the casing 6.
The input shaft 7 and the driving body 1, which is the main shaft of the AC variable speed servo motor, are connected by a joint 8, one oval gear 5 is fixed to the input shaft 7, and the output shaft 9 is supported by the casing 6. A transmission shaft ship is supported between the output shaft 9 and the casing 6, the other elliptical gear 5 is fixed to this transmission shaft joint, and a holder 11 is fixed to the end of the transmission shaft and its rotational position can be adjusted. three rotating shafts are supported on the holder 11, a gear B is fixed to one end of the rotating shaft, and a gear μ is formed at the other end of the rotating shaft; The transmission shaft 10 is formed with a gear portion that can mesh with three gears B, and the output shaft 9 is formed with a meshing portion that can mesh with three gears μ.

`` is a transmission mechanism, which in this case is incorporated in a variable speed servo motor, which is the drive source S.

The song is a phase adjustment mechanism, and in this case, the casing 6 has a
C servo motor 4 is installed, the rotation adjustment shaft is rotatably supported on the casing 6, and the main shaft of AC servo motor 4 is attached.
and the rotationally adjustable lees powder are connected through a joint, a gear portion is formed on the outer periphery of the holding body U, and a gear portion U is formed on the rotationally adjustable axis.

Since this embodiment has the above-mentioned configuration, when the drive source 3 rotates the weight of the driving force with the AC servo motor 4 stopped and the rotation adjustment of the phase adjuster 3 with the lees powder fixed in position, the input shaft 7 rotates. Then, the transmission shaft node rotates via the elliptical gears 5, 5, the three gear sections rotate by the gear section, the gear μ rotates via the rotating shaft, and the relationship between the gear μ and the gear section rotates. Due to the meshing, the output shaft 9 rotates and the driven body 2 rotates.

In this case, even if the driving body I rotates at a constant angular velocity, the driven body 2 due to the elliptical gears 5, 5 rotates while the angular velocity changes with the angular velocity ratio diagram shown in FIG. 4, which is a single chord curve for illustration purposes. become.

Also, the transmission mechanism U, in this case a variable speed AC as the drive source 3
When the rotational speed of the driving body weight is changed by the servo motor, the point of the driven body 2 rotates with various periodic circumferential velocities and periods T as shown in FIG. b is 600r on the driving body l side
pm and c are when the driving force side rotates at 300 rpm,
The point where the driven body 2 is formed rotates with a circumferential speed as shown in this diagram.

At this time, when the rotation adjustment of the phase adjuster is rotated by a predetermined amount, the transmission shaft stirrup is held by the gear part because the variable speed AC servo motor serving as the drive source 3 is stopped and the position is fixed. The body 11 rotates, which causes a shift in the phase lead/lag of the lines a, b, and c in FIG. 5, for example.

For this reason, as shown in Fig. 5.6, for example, in a film packaging machine, as the size and content of the packaged product W change, the seal position S of the printer H with respect to the film F, that is, the pitch dimension P between the seals changes. In order to do this, if the transfer speed Vs of the film F is changed and the peripheral speed V of the heater H at the time of heat sealing is changed in accordance with this transfer speed V8, for example, as shown in Fig. 5, at the time of heat sealing, Assuming that the number of revolutions M is required as the number of revolutions corresponding to the circumferential speed 1 of the heater H, first, the number of revolutions on the driving body 1 side is varied by transmission ellipse, and the number of revolutions M is required on the side of the driven body 2. Set a rotation speed range in which rotation speed M can be obtained, select a rotation speed with a period T that matches the above-mentioned pitch between seals P from among these rotation speeds, and then shift the phase by using a phase adjuster ellipse. All you have to do is synchronize it with the seal timing.

This is done not only in the heat sealing operation in the film packaging machine, but also in cases where the speed of one member is made to follow the speed of the other member.

Therefore, the rotation of the driving body 1 is transmitted to the driven body 2 with periodic changes in angular velocity by the inconstant rotation transmission mechanism 4,
The speed change mechanism changes the rotational speed of the driving body s and transmits it to the driven body 2, and the phase adjustment mechanism changes the rotational phase of the driven body 2. It is possible to easily make the speed of one member follow the speed of the other member.

Note that the present invention is not limited to the above embodiment, and in the above embodiment, the elliptical gears 5 and 5 are used as the inconstant rotation transmission mechanism 4.
However, other non-circular gears or other transmission mechanisms that transmit transmission with changes in angular velocity may be used, or a transmission mechanism "
may be configured separately from the drive source 3, or may be a phase adjuster of another manual structure, and may be designed with appropriate changes.

[Effects of the Invention] As described above, the present invention is capable of transmitting the rotation of the driving body to the driven body with periodic changes in angular velocity using an inconstant rotation transmission mechanism, and that the rotation speed of the driving body can be changed by the transmission mechanism. The rotational phase of the driven body can be changed by a phase adjustment mechanism, so that the speed of one member can be easily made to follow the speed of the other member. I can do it.

As described above, the intended purpose can be fully achieved.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is an overall sectional view, FIG. 2 is a partial sectional view, FIG. 3 is a partial sectional view, FIG. 4 is an angular velocity ratio diagram, and FIG. The figure is a circumferential speed-time diagram, FIG. 6 is an explanatory diagram of heat sealing, and FIG. 7 is an explanatory sectional view thereof. Fig. 4 1... Driving body, 2... Driven body 54... Inconstant speed rotation transmission mechanism, ``... Transmission mechanism, Phase adjustment mechanism. Fig. 5 July 1990 Filed on the 31st Person Nippon Seiki Co., Ltd.

Claims (1)

[Claims] An inconstant rotation transmission mechanism that transmits the rotation of the driving body to the driven body through periodic changes in angular velocity, a transmission mechanism that can vary the rotational speed of the driving body, and a phase that can vary the rotational phase of the driven body. A rotation transmission mechanism comprising: an adjustment mechanism.