JPH07125822A - Bobbin individualizing device - Google Patents

Abstract

PURPOSE:To provide a bobbin individualizing device by which vibration can be always easily maintained in the vicinity of a resonance frequency when inside bobbins are individualized by vibration of a vessel. CONSTITUTION:In a bobbin individualizing device which has a vessel 1 to which bobbins are inputted and vibrating devices 10 to vibrate the vessel and individualizes the inputted bobbins by vibrating the vessel 1, inverters are provided as driving devices 20 and 21 of the vibrating devices 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bobbin individualizing device for inserting a large number of bobbins into a container and vibrating the containers to individualize the bobbins and convey the spiral path.

[0002]

2. Description of the Related Art A large number of various parts are put in a bowl-shaped container having a spiral passage therein, and by vibrating the bowl-shaped container, the parts are aligned when they are conveyed up the spiral passage. A device for supplying parts and the like one by one is generally called a parts feeder and is widely used.
This parts feeder is used, for example, in a factory that handles yarns, for example, a bobbin wound with a spun yarn is loaded in a packaged state, wound around a bobbin in a predetermined package, or a processing device for performing various treatments on the yarn is provided one by one. Such a parts feeder is used for transportation.

In this parts feeder, the bowl-shaped container is supported by a leaf spring, and an electromagnetic magnet is arranged at a distance of several mm as a core gap from an iron plate fixed to the lower surface of the container. The electromagnetic magnet is close to the resonance frequency of the apparatus. The bowl-shaped container is vibrated by applying the current of the frequency.

[0004]

In the above parts feeder, the leaf springs for supporting the bowl-shaped container are supported at equal intervals between the supporting substrate and the lower surface of the container at about eight positions. Has one end fixed to the support base, linearly extending obliquely upward and the other end fixed to a fixing portion on the bottom surface of the container, and therefore this plate spring is a linear plate spring.

On the other hand, in order to give a large vibration to the bowl-shaped container with as little electric power as possible, when the frequency of the electromagnetic magnet is brought close to the natural frequency of the container and its supporting device, the container and its supporting device resonate. , Large vibration can be obtained with less electric power. However, since the electromagnetic magnet uses a commercially available power source, the energization frequency to the magnet is set to 50 Hz or 60 Hz depending on the area of use.

Therefore, in order to resonate the parts feeder, it is necessary to adjust the weight of the entire parts feeder, or to adjust the overlapping number of plate springs supporting the bowl-shaped container, adjusting the plate thickness, or adjusting the spring material. However, it is extremely difficult to set the resonance frequency to an appropriate value.

Moreover, since the resonance frequency changes depending on the weight of the entire parts feeder, the total weight is reduced by the number of bobbins supplied to the parts feeder, and by sequentially sending the parts from the parts feeder, the bobbins in the parts feeder are reduced. Therefore, even if the resonance frequency is set by various means so as to be adapted in a predetermined state, it sometimes changes during use, so that it is not possible to always give proper vibration.

Therefore, it is an object of the present invention to provide a bobbin individualizing device which can easily and constantly maintain the vibration near the resonance frequency when individualizing the bobbin inside by vibrating the container.

[0009]

In order to solve the above-mentioned problems, the present invention comprises a container for loading a bobbin and a vibrating device for vibrating the container. By vibrating the container, the loaded bobbin is removed. In the bobbin individualizing device to be individualized, an inverter is provided as a driving device of the vibration device.

[0010]

Since the present invention is configured as described above, the bobbin thrown into the container vibrates in the vicinity of its natural frequency while being supported by the spring by passing a current of a predetermined frequency to the electromagnetic magnet. , The internal bobbin also vibrates. As a result, the bobbins are raised along the spiral path, the bobbins being individualized and fed one by one to the outside. The frequency of the current supplied to the electromagnetic magnet is changed by the inverter in response to the change in the natural frequency based on the change in the total weight that changes according to the bobbin amount, by the signal from the bobbin amount detecting means in the container. , Always vibrate the container at a frequency near the natural frequency.

[0011]

Embodiments of the present invention will be described with reference to the drawings. A parts feeder 5 having a spiral passage 4 extending from a central bottom portion 2 in a bowl-shaped container 1 to an outlet 3 at an outer peripheral upper edge is a bobbin 6 conveyed to the central bottom portion 2 from above by a conveyor.
Is thrown in. A support plate 8 is fixed to the bottom rear surface 7 of the bowl-shaped container 1, and the outer peripheral lower surface thereof is supported by a support base 11 by eight leaf springs 10 in the figure.

The leaf spring 10 is formed by laminating a plurality of leaf spring materials, both ends thereof are bent in opposite directions, and the tip of the upper horizontal portion 12 is fixed to the support plate 8 by a bolt 13, The tip of the horizontal portion 14 is fixed to the base 11 with a bolt 15. The leaf spring 10 has a linear intermediate portion 18 between the bent portion 16 of the upper horizontal portion 12 and the bent portion 17 of the lower horizontal portion 14.

A magnetic material 20 is provided at the center of the lower surface of the support plate 8.
Is fixed, and the electromagnetic magnet 21 is supported and fixed on the base 11 through a slight gap from the lower surface of the magnetic body 20. As shown in FIG. 3, this electromagnetic magnet 21 is energized to an AC power source 22 via an inverter 23.

A bobbin transfer conveyor 24 is provided at the outlet 3 of the spiral passage 4 in the upper part of the parts feeder 5.
With this bobbin transfer conveyer, the bobbins sequentially aligned and conveyed by the parts feeder 5 are transferred to the next bobbin conveyer. A bobbin transfer amount detector 25 is provided at the outlet 3, and the detector 25 detects the bobbin transferred from the parts feeder 5 to the bobbin transfer conveyor 24 and outputs it to the controller 26. The bobbin loading amount to the parts feeder 5 is input to the controller 26 from a bobbin loading amount detector 27 (not shown), and the amount of bobbins present in the parts feeder 5 is detected based on the data from both detectors. To do.

The control device 26 integrates the weight per bobbin to calculate the total weight of the bobbin, and adds up the weights of the parts feeders which have been weighed in advance.
Calculate the total weight supported by 0. Next, the resonance frequency is calculated by a known resonance frequency calculation formula of the vibration system of the spring based on the spring constant of the entire leaf spring 10 and the characteristic for vibration, and the frequency slightly deviated from the resonance frequency is set. , The inverter 23 is controlled to have that frequency. The reason that the frequency of the inverter 23 is slightly shifted from the resonance frequency is that this vibration, which is the resonance frequency itself, is diverged and the parts feeder is damaged.

Since the vibration of the parts feeder 5 is controlled by the control device 26 as described above, from the time when the bobbins are put into the parts feeder, the bobbins come out one by one by the operation of the parts feeder. According to the above, the weight of the vibration system supported by the spring can be accurately measured, the resonance frequency can be accurately calculated, and the parts feeder can always be maintained in a vibration state within the optimum range.

Although a substantially Z-shaped leaf spring is used in the above apparatus, such a leaf spring is different in characteristics as shown in FIG. 4 as compared with a normally used flat leaf spring. That is,
FIG. 4 (a) shows the characteristics of a flat plate-shaped leaf spring, and the spring deformation amount and the load amount are in a proportional relationship, but when a substantially Z-shaped leaf spring is used, as shown in FIG. 4 (b). Various non-linear characteristics can be obtained by selecting the various shapes. As a result, when this substantially Z-shaped leaf spring is used in the above-described vibration system, its vibration characteristic is as shown in FIG.
As shown in (a), the specific frequency range, that is, the resonance frequency f
_{While a} large amplitude is shown in a narrow range of ₁ region, the substantially Z-shaped leaf spring has a resonance frequency f as shown in FIG.
_{Even in the 2} region itself, there is no peculiar large amplitude,
Moreover, the same amplitude is shown in a wide range before and after the frequency range.

As is clear from the above-mentioned spring characteristics, the ideal vibration characteristics of the parts feeder are such that the resonance characteristics are maintained to some extent so that a large vibration can be obtained with a small amount of electric power, while the vibration is too large in the resonance frequency range. It is necessary to prevent the equipment from being damaged due to the amplitude, and when performing frequency control corresponding to the weight change of the parts feeder,
Although a large amplitude change is not caused by a slight control deviation, and a characteristic that an amplitude change with respect to a frequency change is relatively small in the resonance frequency region is required, all of the present invention can be applied.

In the above embodiment, the control device 26
Shows an example in which the bobbin weight is calculated based on the amount of bobbins input into and discharged from the parts feeder, and further various calculations are performed.However, simply detecting the change in the number of bobbins on the parts feeder,
The control may be simplified so that the frequency change corresponding to the change is performed. In addition, the vibration frequency may be controlled by detecting the amplitude of the parts feeder by utilizing the fact that the amplitude of the parts feeder changes due to the change in the number of bobbins. The vibration frequency may be controlled by changing the weight. It is also possible to detect the vibration frequency during operation of the parts feeder and perform feedback control of the vibration frequency based on the deviation from the predetermined vibration frequency.

In the above embodiment, a leaf spring is used as a spring for supporting the parts feeder, and a substantially Z-shaped leaf spring is used. However, in addition to the substantially Z-shaped leaf spring, it is well known. Leaf springs with various non-linear characteristics can be used.
In addition to the leaf springs, well-known leaf springs having various non-linear characteristics can be used.

[0021]

Since the present invention is constructed as described above,
It can be easily adjusted to the optimum frequency, and in addition, it can keep the vibration near the resonance frequency at all times in response to the change in the total weight due to the change in the bobbin in the container. Since it is only controlled, it can be controlled inexpensively, easily and accurately.

[Brief description of drawings]

FIG. 1 is a plan view of a parts feeder to which the present invention is applied.

FIG. 2 is a side view of the same.

FIG. 3 is a bottom view schematically showing a control unit with the same portion deleted.

FIG. 4 is a comparative diagram of spring displacement amount characteristics.

FIG. 5 is a comparative view of spring vibration characteristics.

[Explanation of symbols]

 1 bowl-shaped container 2 center bottom 3 outlet 4 spiral passage 5 parts feeder 6 bobbin 8 support plate 10 leaf spring 11 base 20 magnetic material 21 electromagnetic magnet 22 AC power supply 23 inverter 24 transfer conveyor 25 transfer amount detector 26 controller 27 Input amount detector

Claims (1)

[Claims] 1. A bobbin individualizing device, which comprises a container for loading a bobbin and a vibrating device for vibrating the container, wherein the bobbin individualizing device vibrates the container to individualize the loaded bobbin. A bobbin individualizing device, characterized in that it is provided with an inverter.