JPH0211404Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape feeding device suitable for application to a feeding device for recording paper of a recorder, a magnetic recording device, a feeding device for perforated tape, and the like.

Conventionally, the driving source for this type of tape feeding device is a variety of motors that apply magnetism, but since they basically utilize the action of the magnetic field generated by magnetism, Joule heat , energy losses such as hysteresis loss and eddy current loss are common drawbacks.

In addition, in a slow-speed travel drive unit such as a tape travel mechanism for seismic recorders, the rotational speed of the drive motor is slowed down using a large number of gears.
There is a tendency for such devices to become more complex and larger, creating a path toward miniaturization.

In view of these points, the present invention utilizes the bending vibration of a bimorph element using a piezoelectric inverse effect as a driving source, and is a tape feeding device of this type that has low energy loss, does not generate electromagnetic noise, and can be made smaller and lighter. The main purpose is to propose.

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic perspective view showing an example of the present invention. 1, 2, 3, 4 are two rectangular piezoelectric ceramic plates made of elastic plates (shims) 1a, 2a, 3a,
4a is shown, bimorph elements 1 and 3 are made into a first comprehensive vibrating body 10, and bimorph elements 2 and 4 are made into a second comprehensive vibrating body 20. 5 is the lower bimorph element 1,
2, a U-shaped metal fitting attached to the shim plates 1a and 2a; 6, a jig for fixing the four bimorph elements 1, 2, 3, and 4; 7, a transfer tape;
This is placed on the upper bimorph elements 3 and 4, and is sandwiched between U-shaped metal fittings 5 at both ends of each. Bimorph elements 1, 2, 3, and 4 have the same resonant frequency Wo, and when an alternating current voltage of this frequency is applied, each end vibrates greatly. Note that the phase of vibration can be controlled by adjusting the phase of the applied voltage.

Next, the operation of the present invention will be explained with reference to FIG. For convenience, the operation of the device of the present invention will be explained in each step of →→→→ in the figure.

First, at →, the second integrated vibrating body 20, that is, the bimorph elements 2 and 4, undergoes a process from a state where a voltage is applied so as to bend inward until they become parallel. In other words, no tightening force is applied to the tape 7 at all. On the other hand, the first general vibrating body 10, that is, the bimorph elements 1 and 3, are both bent in the same downward direction, and the tape 7 (not shown) is held between the U-shaped metal fittings 5 at the end of the bimorph element 3. The bimorph element 3 is bent together with the bimorph element 3, and is eventually pulled from left to right by the transfer amount Δl. The transfer amount Δl is
When the length of the bimorph element 3 is l, the thickness is t, and the radius of curvature when it is bent is R, it is expressed as Δl=tl/2R.

At →, the second integrated vibrating body 20, that is, the bimorph elements 2 and 4, is applied with a voltage so as to open outward from each other, so that a tightening force is applied to the tape 7, thereby preventing the tape 7 from moving in the lateral direction. It becomes like this. Note that the U-shaped metal fitting 5 on the left side does not extend as shown in the figure, and in reality, it is impossible for the bimorph elements 2 and 4 to open outward, but in order to clarify the phase relationship, the expression as shown in the figure is used. are doing. On the other hand, the first general vibrating body 10, that is, the bimorph elements 1 and 3, returns upward in the same way,
As a result, the tape 7 is pushed out to the right by the amount Δl of the tape 7.

→, the second integrated vibrating body 20, that is, the bimorph elements 2, 4, shifts from the maximum tightening state to the zero tightening state. That is, the first general vibrating body 10, that is, the bimorph elements 1 and 3, both bend upward due to the application of a reverse voltage, but in this process, no tightening force is applied, and therefore the tape 7 does not move.

→, the second integrated vibrating body 20, that is, the bimorph elements 2, 4, is further bent inward, and there is no tightening action of the tape 7 during this period. The first general vibrating body 10, that is, the bimorph elements 1 and 3, is in the process of returning its upper deflection to parallel, and there is no tightening action on the tape 7 on this side as well, and it becomes ready for the next process.

During the above one cycle, the tape 7 is fed rightward by a transfer amount Δl. Therefore, the tape 7 is sequentially fed to the right by the vibrations of the four bimorph elements 1, 2, 3, and 4. In this case, as shown in FIG. 3, four bimorph elements 1, 2, 3, 4
The phase relationship in the vibrations is such that bimorph element 2 lags behind bimorph elements 1 and 3 by π/2, and bimorph element 4 lags behind bimorph element 2 by π/2.
The applied voltage is supplied so that the polarity is opposite to π or the polarity is opposite to π. Furthermore, V ₁ , V ₂ ,
V ₃ and V ₄ each indicate the amount of change in drive of the bimorph element over time.

FIG. 4 shows another example of the applied voltage, that is, another method of driving the bimorph element. In this example, the bimorph elements 1 and 3 are vibrated in opposite directions, and the bimorph elements 2 and 4 are configured to vibrate in the same phase and shifted by π/2 with respect to the bimorph element 1. In this case, the tape 7 will move in the opposite direction to the left. This change is shown in →→→→ in FIG.
A detailed explanation will be omitted since it will be clear with reference to the example in FIG.

As described above, according to the present invention, the first and second
A first and a second comprehensive vibrating body, which are integrated with bimorph oscillators, are arranged in parallel at a certain interval, and a tape running against the first comprehensive bimorph vibrating body is connected to the second comprehensive bimorph vibrating body. An alternating current that applies to the first and second comprehensive bimorph vibrating bodies the action of tightening or releasing the U-shaped metal fittings attached to both ends of the body, and the action of pulling the tape in one direction by the bending of the bimorph element. Since the tape is transferred to the left or right by controlling the phase of the voltage, various energy losses are extremely small.Moreover, during slow-speed transfer, the rotational speed of the drive source is controlled by mechanical gears, etc. Therefore, it is possible to provide a tape feeding device with less mechanical loss than the conventional tape feeding device that converts mechanically.

Therefore, in the field of various recorders and information equipment, it is low power consumption, lightweight, does not generate noise, and can efficiently eliminate various losses that occur when electromagnetic drive sources are used, reducing power consumption. You can save money. Furthermore, since the driving force transmission means is extremely simplified, the entire device can be downsized.

Therefore, it is possible to provide this type of feeding device with low power consumption and light weight in the fields of various recorders and information equipment, and a wide range of applications can be expected.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of the present invention, FIG. 2 is an explanatory diagram for explaining the operation of the present invention, and FIG. 3 is a waveform diagram showing an example of the driving voltage of the bimorph diaphragm. FIG. 4 is a waveform diagram showing another example of the driving voltage of the bimorph diaphragm, and FIG. 5 is a diagram for explaining another driving method of the present invention. 1, 2, 3, 4... Bimorph element, 5... U-shaped metal fitting, 7... Transfer tape, 10... First comprehensive vibrating body, 20... Second comprehensive vibrating body.

Claims (1)

[Scope of utility model registration request] First and second integrated vibrators, which are integrated with first and second bimorph vibrators and third and fourth bimorph vibrators whose free ends extend to the left and right with the fixed part as the center, are arranged in parallel at a constant interval. Then, the tape running against the first comprehensive bimorph vibrator is connected to the second integrated bimorph vibrator.
The first and second integrated bimorph vibrations include the action of tightening or releasing the U-shaped metal fittings attached to both ends of the integrated bimorph vibrating body, and the action of pulling the tape in one direction by the deflection of the bimorph element. A tape feeding device, characterized in that the tape is controlled by the phase of an alternating current voltage applied to the body to transfer the tape to the left or right.