JPH0242658Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a parts feeder that drives a leaf spring using an electrostrictive element to transport mainly small articles to the next process.

"Prior art" A parts feeder using this type of electrostrictive element as a driving source is operated by a commercial voltage of 100 to 200 VAC.
It is known for its low power consumption and miniaturization of devices, but conventionally the electrostrictive element and the leaf spring to which the electrostrictive element is attached are insulated by a thin film made of insulating paint. However, after long-term use, the thin film of insulating paint, which has poor durability, could deteriorate and crack, and in extreme cases, it could peel off and become unusable. .

In order to improve this, the present applicant first applied for the
-155186 (refer to Utility Model Application Publication No. 61-72509), in place of the above-mentioned insulating paint, "a plate spring with an electrostrictive element attached thereto is coated with a heat-shrinkable tube around the electrostrictive element. We proposed a "parts feeder with an insulating layer."

"Problems that the invention attempts to solve"
Although the parts feeder proposed in the above publication (refer to the above publication) achieved almost the intended purpose, the electrostrictive element and the surrounding leaf spring were insulated and protected by a heat-shrinkable tube that covered the entire surface of the leaf spring. The lead wire, which is connected by soldering etc. to the electrode surface exposed to the outside on the opposite side to the pasted surface of the electrostrictive element, is connected along the side surface of the laminated body of the leaf spring and the electrostrictive element. Since the lead wires must be covered with a heat shrink tube at the same time, there is a risk that a gap may be created between the lead wire and the coating layer during long-term use, reducing the moisture-proofing effect of the heat shrink tube. .

``Means for solving the problem'' Heat shrink the electrostrictive element with a small hole to expose the part of the electrode surface opposite to the electrode surface where the lead wire should be connected. After pasting the above two together with a tube, covering the laminate and connecting the lead wires in the small hole by soldering, etc., the small hole of the heat shrink tube is sealed with an insulating filler. do.

"Example" FIG. 1 shows the basic aspect of a linear type parts feeder using an inclined leaf spring as an example of a parts feeder. A number of articles P are placed on the vibration frame 2.
The excitation frame 2 has a lower horizontal frame plate 21a fixed on the base 1, and an upper horizontal frame plate 21a fixed to the upper surface of the trough 8. The horizontal frame plate 21b is connected to the front and rear inclined leaf springs 22a and 22b, and each of these inclined leaf springs 22a and 22b is coated with lead zirconate titanate on either the inner or outer surface, or on both surfaces (in the figure, the outer surface). It is made of a compound, etc., and metallized electrode surfaces (not shown) are formed on both main surfaces by baking silver, etc.
Produced by the usual method of polarization with DC voltage,
The vibrating parts 2',
2'', and the upper and lower horizontal frame plates 21a, 2
An insulating paint (not shown) is applied to the exposed surfaces of the plate-shaped electrostrictive elements 23a and 23b before or after they are connected to the electrostrictive elements 1b, respectively, but in the present invention, as shown in FIG. The above-mentioned inclined leaf springs 22a and 22b and the plate-shaped electrostrictive element 23
In the vibrating portions 2', 2'' consisting of the electrostrictive elements 23a, 23a' and 23b, 23b', the surrounding inclined leaf springs 22a, 23
a, the inclined leaf springs 22a, 22, respectively.
Electrode surfaces 231a, 232a and 2 attached to b
31b, 232b and the opposite electrode surface 231a', 2
A heat-shrinkable tube 5 made of silicone rubber, fluorine rubber, etc., with small holes 5a, 5a' and 5b, 5b' that expose parts of 32a', 231b', and 232b'.
The small holes 5a, 5a' and 5
Lead wires 4a, 4a connect in parallel the electrostrictive elements affixed to both main surfaces of each of these inclined leaf springs to the electrode surfaces 231a', 232a' and 231b', 232b' exposed on the electrode surfaces 231a', 232a', 231b', 232b' exposed on the electrode surfaces 231a', 5b'. ' and 4b, 4b' are soldered by soldering 41a, 41a', 41b, 41b', etc., and then these lead wires 4a, 4a', and 4
Small holes 5a, 5a' and 5b, 5 where b, 4b' were planted
b' is sealed with insulating fillers 6a, 6a' and 6b, 6b' such as epoxy resin.

In FIG. 2, electrostrictive elements 23a, 23a' and 23b, 2 are provided on the main surfaces of inclined plate springs 22a, 22b forming vibrating portions 2' and 2'', respectively.
3b' and connected these electrostrictive elements in parallel to increase the mechanical output, but as described with reference to Fig. It may be attached only to the main surface.

In addition to alternating current, the power source for driving the electrostrictive element can also be direct current by providing a switching mechanism.Furthermore, it is not limited to the straight type shown in the example, but can also be a curved type that conveys objects in a spiral direction. It can also be applied to parts feeders, etc.

``Effects of the invention'' The parts feeder of the invention, which has the above-described structure, connects and fixes the electrostrictive element to the inclined plate spring extremely firmly using the heat-shrinkable tube, and the lead wire is inserted through the small hole of the heat-shrinkable tube. Since it is drawn out perpendicularly to the main surface of the electrostrictive element and sealed with an insulating filler filled around it, there is no risk of affecting the heat shrink tube and it greatly improves durability. It has a positive effect.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a linear parts feeder shown as an example of a parts feeder, Fig. 2 shows a vibrating part used in the parts feeder of the present invention, Fig. A is a longitudinal side view, and Fig. B is a plan view. 22a, 22b...plate spring, 23a, 23a',
23b, 23b'...electrostrictive element, 231a, 231
a', 231b, 231b'232a, 232a', 2
32b, 232b'...electrode surface, 3...carrier, 4
a, 4a', 4b, 4b'...Lead wire, 5...Heat shrink tube, 5a, 5a', 5b', 5b'...Small hole,
6a, 6a', 6b, 6b'...Heat shrink tube.

Claims (1)

[Scope of utility model registration request] In a device in which a conveyor is driven by a plate spring that also serves as one electrode plate, with an electrostrictive element attached to at least one main surface, the electrostrictive element is attached to the opposite side of the attached surface along with the surrounding plate springs. After insulating and covering the electrode surface with a heat-shrinkable tube having a small hole exposing a part of the electrode surface, and connecting the lead wire of the other polarity corresponding to the leaf spring side to the electrode surface exposed from the small hole, A parts feeder in which the gap formed between the inner wall of a small hole in a heat-shrinkable tube is sealed with an insulating filler.