JPS59113612A - Method and device for winding wound-type ceramic electronic component - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Field of the Invention The present invention is applied to a process for manufacturing rolled-up ceramic electronic components such as capacitors obtained by firing rolled-up ceramic green sheets. The present invention relates to a method and apparatus for wrapping ceramic green sheets around the circumferential surface of a core.

Description of Prior Art Capacitors, coils, etc., for example, have been proposed as wound-type ceramic electronic components and are in practical use.

FIG. 1 is a perspective view showing a completed state of winding of a winding type ceramic capacitor as an example of a winding type ceramic electronic component. FIG. 2 is a sectional view taken along the line "G" in FIG. 1.

In general, wound-type ceramic electronic components, including the wound-type ceramic capacitor shown here, have a configuration in which a ceramic green sheet 2 is wound around the outer peripheral surface of a rod-shaped core 1, and sheet stores constituting each station are laminated. Take. At this time,
Various electronic components can be obtained depending on the conductive pattern formed on the ceramic green sheet 2.

As shown in FIG. 2, when obtaining a capacitor, the conductive portion formed on the ceramic green sheet (2) constitutes the first and second internal TIF poles 3, 4, respectively. A capacitance is formed between the first internal electrode 3 and the second internal electrode 4. Although not shown, external electrodes are formed on both end surfaces of the structure shown in FIG. 2, one of which is electrically connected to the first internal electrode 3, and the other external electrode is connected to the second internal electrode. 4 and is brought into electrical continuity. First and second internal electrodes 3 as shown in FIG.
．． In order to obtain 4, two methods are typically considered.

FIGS. 3 and 4 are plan views of ceramic green sheets for explaining a first example of the internal electrode forming method. In this elbow, two ceramic green sheets 2a,
2b is used. A first internal electrode tI3 is formed on one surface of one ceramic green sheet 2a, and a second internal electrode 4 is formed on one surface of the other ceramic green sheet 2b. The first internal electrode 3 formed on one ceramic green sheet 2a is formed on one surface of the ceramic green sheet 2a, leaving margins at the starting end 5, the right side line part 6, and the terminal end 7, respectively. The other ceramic green sheet 2b
The second internal electrode 4 is formed on one surface of the ceramic green sheet 2b, leaving margins at the starting end 8, left edge 9, and terminal end 10, respectively. And both ceramic green sea) -2a, 2b
When they are stacked and rolled up in the direction shown in the drawing, an internal electrode formation state as shown in FIG. 2 is obtained.

FIG. 5 is a plan view of a ceramic green sheet illustrating a second example of the internal electrode forming method. In this second example, only one ceramic green sheet 2 is used. A first internal voltage 1f'3 and a second internal voltage are provided on one surface of the ceramic green sheet 2 via an insulating gap 11.
A plurality of internal electrodes 4 are arranged alternately in the length direction of the ceramic green sheet 2. Each first internal electrode 3 is formed such that its left side edge extends to the left side edge of the ceramic green sheet 2, and its right side edge leaves a predetermined margin 12 at the right side edge of the ceramic green sheet 2. Each second internal electrode 4 is formed such that its left edge leaves a predetermined margin 13 at the left edge of the ceramic green sheet 2 and its right edge extends to the right edge of the ceramic green sheet 2. When one such ceramic green sheet 2 is used and rolled up to form a capacitance with the first internal electrode 3 and the second internal electrode 4 as shown in Fig. j112, as shown in Fig. 6. As shown, the first internal electrode 3 and the second internal electrode 4 are
In order to efficiently obtain a large capacity, it is preferable to sandwich the ceramic green sheets 2 and make them face each other over approximately one circumference. To this end, the longitudinal force dimension L1.12 of each internal electrode 3.4 is required. ....

As shown in FIG. 5, it is preferable to gradually increase ln from the inner circumferential side to the outer circumferential side.

FIG. 7 is a plan view illustrating a state in which the S-position portion of a ceramic green sheet is formed for use in manufacturing a wound ceramic coil as another example of a wound ceramic electronic component. On the left and right side trunks of the ceramic green sheet 2 shown here, lead-out terminals [14, 15] are formed, respectively, for achieving electrical connection with external electrodes (not shown). When the ceramic green seam [2] is rolled up, the conductive part 16, which becomes a spiral conductive path, extends in the diagonal direction and is electrically connected to both the extraction electrodes 14 and 15. Ru. The ceramic green sheet 2 shown in FIG. 7 is also put into a spring state as shown in FIG. 1, thereby forming a coil.

Figure m8 is a diagram illustrating a conventional winding method. Conventionally, a ceramic green sheet 2 was placed on the circumferential surface of the core 1.
When winding up the two-handed plate 17.18, move the two upper and lower flat plates 17.18 relatively in the direction shown by the arrow 19.
While applying appropriate pressure, the core 1 and the rolled portion of the ceramic green sheet 2 in contact with the core 1 are rolled. In addition, when using the two ceramic green sheets 2a and 2b shown in FIG. 3 J3 and FIG. 4, the two ceramic green sheets 2
With a and 2b superimposed, the core 1 is wound onto the circumferential surface. However, according to this 0-inclusive method, the rolled portion never becomes a perfect circle.

This is because the ceramic green sheets 2 used in such rolled-up ceramic electronic components are required to be flexible in the bending direction, and the upper and lower flat plates 1
7.18, this flexibility results in an ellipse that extends horizontally. In other words, it takes the form of an ellipse as shown by the broken line in FIG. This creates a gap between the ceramic green sheets 2 located on both sides of the core 1. Therefore, this gap will remain in the bag in the subsequent firing process.

When an electronic component is manufactured using a ceramic body with remaining gaps as described above, structural defects such as delamination occur, and moisture resistance properties are deteriorated. Further, particularly in the case of capacitors, the presence of gaps leads to a decrease in capacitance, which leads to variations in capacitance between products.

Further, in the winding method shown in FIG. 8, it is expected that it is difficult to maintain the orthogonality between the direction of the arrow 19 and the axial direction of the core 1. Therefore, the ceramic green sheet 2 wound around the circumferential surface of the core 10 may gradually shift in the axial direction of the core 1, and the end surface of the wound ceramic green sheet 2 may often become a conical surface instead of a flat surface. . If this kind of entanglement occurs, it may cause unevenness between the products of the jqed ceramic electronic components, or it may interfere with the formation of the external electrodes, and especially in the case of condensers, the opposing internal electrodes may You will encounter problems such as the state being incorrect) and correct.

OBJECTS OF THE INVENTION Therefore, it is an object of the present invention to provide a winding method and a mounting method that can roll in ceramic green sheets without any gaps.

Another object of the present invention is to provide a winding method and [1] that can wind the ceramic green seam 1- with both sides thereof properly aligned.

Summary of the Invention The method of the present invention is characterized in that bells 1 to 1 are used for winding up ceramic green sheets. This belt, with a portion thereof bent, is passed between a pair of guide surfaces, and a loop-shaped portion is formed that projects from between the pair of guide surfaces. The pair of guide surfaces are opposed to each other and extend in parallel with a predetermined interval. One end of the ceramic green sheet is inserted into the inner space of the ring-shaped portion. A core is arranged on one side of one end of the ceramic green sheet. This core arrangement? The conditions are selected such that the axial direction of the core coincides with the width direction of the belt.

In this state, when the belt moves relative to the pair of guide surfaces, the ceramic green sheet can be rolled up on the circumferential surface of the core within the looped portion. That is, the outer circumferential surface of the annular portion is in contact with both of the pair of guide surfaces, and the inner circumferential surface of the annular portion is in contact with a part of the outer circumferential surface of the core and the other surface of one end of the ceramic green sheet. It is considered to be in contact. The distance between the pair of guide surfaces is set so that even if tension is applied to the belt, the core passes between the pair of guide surfaces and the looped portion does not unwind.
Set. Under such conditions, when relative movement of the belt occurs, the ceramic green sheet is moved around the annular part by rotating the bar about its axis within the annular part as the belt moves. Inner drawing, the ceramic green sheet is rolled onto the outer circumferential surface of the core while bringing the other surface of the ceramic green sheet 1 into contact with the inner circumferential surface of the annular portion. Finally, the ceramic green sheet rolled on the core is taken out from the ring-shaped part, and there is one ceramic green sheet in the desired rolled shape! You will be beaten.

The device of the invention advantageously implements the winding method as described above, in which the belt is driven in its longitudinal direction. The guide rods constituting the pair of guide surfaces described above are located on one side of the belt, extend in the width direction of the belt, and are spaced apart from each other. This pair of guide rods is configured so that the distance between them can be changed.

The means for forming the annular portion described above may include, for example,
It is composed of a rotatably provided arm and a protruding member attached to the end of the arm, and a loop-shaped portion is formed when the protruding member pushes the other side of the belt. In order to insert the ceramic green sheet into such an annular portion, a stand that holds the ceramic green sheet with its end protruding;
Means are provided for moving the platform towards the annulus. A means for supplying the core to one side of the ceramic green sheet within the inner space of the loop-shaped portion is provided, and a winding device is achieved.

DESCRIPTION OF EMBODIMENTS The objects and features of the present invention will become more apparent from the following description of embodiments with reference to the drawings.

The following examples relate - by way of example - to the manufacture of wound ceramic capacitors.

FIG. 9 is a plan view showing a more practical state of forming internal electrodes on a ceramic green sheet used in manufacturing a wound type ceramic capacitor.

FIG. 10 shows a state in which the ceramic green sheet of FIG. 9 is wound around the circumferential surface of the core. The ceramic green sheet 2o shown in FIG. 9 has substantially the same internal electrode pattern as the ceramic green sheet 2 shown in FIG. 5 when cut along the dashed line 21. That is, some of the conductive parts 22 formed on the ceramic green sheet 2o are connected to the first internal conductor 4ff1 in FIG.
3, and something becomes the second internal voltage l1i4,
Furthermore, in some cases, each side of the half portion cut along the cutting line 21 has the first or second internal electrode 3 or 4.
becomes. If an electrode formation pattern as shown in FIG. 9 is adopted, winding for a plurality of condensers can be performed simultaneously by winding the ceramic green sheet 2° once. That is, as shown in FIG.
After the ceramic green sheet 2o is wound around the circumferential surface of the ceramic green sheet 3, cutting along the cutting line 21 is performed.

The ceramic green sheet 20 is formed into a sheet shape by adding a thermoplastic resin such as polyvinyl butyral or vinyl acetate as a binder to a ceramic powder material.

Below, the ceramic green sheet 20 shown in FIG.
A method and device for winding as shown in FIG. 10 will be explained.

FIGS. 11 to 17 show an embodiment of the method of the present invention in the order of steps.

Referring to FIG. 11, a belt 24 is prepared, and a pair of upper and lower guide rods 25.contact one side of the belt 24.
26 are spaced apart from each other. Guide Azusa 25.
26 both extend in the width direction of the belt and are therefore parallel to each other. Note that the guides 825.26 may be arranged at a position slightly apart from one side of the belt 24.

Referring to FIG. 12, there is a shaft 2 on the use side of the belt 24.
An arm 28 is provided to be rotatable about 7. A curved protrusion member 29 is attached to the fIJ portion of the arm 28. The arm 28 rotates and the protruding member 29
However, when the other side of the belt 24 is pushed, the pair of guide rods 25
．． At 261 m, the belt 24 is bent and passes between a pair of guides 8125, 26 to form a protruding ring-shaped portion 3.
0 is formed. After the formation of the annular portion 30, the arm 28 is rotated in the opposite direction and the protruding member 29 is withdrawn from the annular portion 30.

Referring to FIG. 113, a ceramic green sheet 20 is held on a holding table 31, and the end thereof is formed into a ring-shaped portion 30.
inserted within. It is preferable that the ceramic green sheet 20 is held on the holding stand 31 with its end portion protruding.

Referring to FIG. 14, the core 23 is supplied onto the ceramic green sheet 20 as shown by the dotted line, and then carried along the upper surface of the ceramic green sheet 20 to the position shown by the solid line. At least at the stage shown in FIG. 14, the pair of guide rods 2b and 26FM are spaced apart to allow the movement of the core 23 as described above. Fig. 14 - (The core 23 is the ring-like part 30
W1 is disposed on one side of the ceramic green sheet 20 in the inner space of the belt 24, and its axial direction is aligned with the belt 24.
The state coincides with the 0 width direction.

Referring to FIG. 15, the distance between the pair of guide rods 25, 26 is narrowed. Accordingly, the core 23 passes through the pair of guide rods 25 and 26 from the annular portion 30 and is prevented from coming out.

When tension is applied to the belt 24 in the state shown in FIG.
26, and the inner circumferential surface of the annular portion 30 is in reliable contact with a part of the outer circumferential surface of the core 23 and the lower surface of one end of the ceramic green sheet 20. In this state, the tension applied to the belt 24 is maintained and the bell! - 24 is moved in the direction of arrow 32 as shown in FIG. , thereby ceramic green sheet 2
0 is drawn into the annulus 30. Accordingly,
Ceramic green sheet 2 is placed on the inner peripheral surface of the ring-shaped portion 30.
The ceramic green sheet 20 is rolled onto the outer circumferential surface of the core 23 while the outward facing surfaces of the ceramic green sheet 20 are in contact with each other. In such a winding process, it is preferable that the distance between the pair of guide rods 25 and 26 be as narrow as possible. This is because the core 23 and the ceramic green sheet 20 are
This is because the force applied from outside is distributed over a range closer to the entire circumference, thereby making it possible to obtain a more tightly wrapped state.

In addition, in the explanation of FIG. 16, the belt 24 is indicated by the arrow 32.
As mentioned above, this movement is performed using the guide rod 25.
．． It only needs to be relative to belt 24.
The pair of guide rods 25 and 26 may be moved while keeping them fixed.

Referring to FIG. 16, preferably, in the final stage of rolling up the ceramic green sheet 20, the heater 33 is brought into contact with the outer circumferential surface of the annular portion 30. The heater 33 is heated to, for example, 140 to 150° C., and acts on the binder contained in the ceramic green sheet 20, and uses this binder to bond at least the end of the rolled ceramic green sheet 20, thereby unwinding the ceramic green sheet 20. The ceramic green sheets 20 are prevented from undesirably unraveling due to the packed bales.

Referring to FIG. 17, the distance between the pair of guide rods 25, 26 is widened, and in this state tension is applied to the belt 24. Accordingly, the ring-shaped portion 3 shown by the dotted line in FIG.
0 passes between the pair of guide rods 25 and 26 and finally disappears. According to this movement of the annular portion 30, the ceramic green sheet 20 and the core 23 pass between the pair of guide rods 25 and 26, and are finally brought to the position shown by the solid line in the 17th factor. From here, it falls downward. In this way, the ceramic green sheet 20 that has been completely rolled up is taken out.

Thereafter, the steps sequentially shown in FIGS. 11 to 17 are repeated.

FIG. 18 is a perspective view showing the arrangement of elements included in one embodiment of the device of the present invention. In FIG. 18, the ceramic green sheet 20 shown in FIGS. 11 to 17 is
．． Core 23, belt 24, guide rod 25, 26, shaft 27,
Arm 28, projection member 29, hoop 30, retainer 31, and heater 33 are shown with the same reference numerals.

The details of each part will be described below with reference to FIG. 18 and each of FIGS. 19 to 24.

FIG. 19 diagrammatically shows the belt 24 and belt drive structure of the apparatus of FIG. 18. In the embodiment now being described, belt 24 is at the right end. Each end of the belt 24 is wound around a rotatably supported main reel 34 and a lower reel 35, respectively. The upper reel 34 is rotationally driven by an upper motor 36 in a direction in which the belt 24 is wound. The lower reel 35 is rotationally driven by the lower motor 37 in the direction of winding the belt 24 .

FIG. 20 shows a cross-sectional view of the upper reel 34 on which the belt 24 is wound. The upper rule 34 has an outer sleeve 28 having a C-shaped cross section.
and an inner rod 39 that fits the inner peripheral surface of the outer sleeve 38. The inner rod 39 is formed with a radially projecting rib 40, which is located within the cutout of the outer sleeve 38.

A compression Gf spring 41 is provided between the rib 40 and the outer sleeve 38.
is arranged, and as a result, the outer sleeve 38 is connected to the inner rod 3.
9, it is always biased to rotate clockwise. A shaft (not shown) that rotatably supports the ascending rule 34 is fixedly provided on the inner rod 39. The belt 24 is inserted between the rib 40 and the outer sleeve 38 on the side opposite to the side on which the compression spring 41 is arranged. by this,
Under the action of the compression spring 41, the end of the belt 24 is fixed with respect to the uprail 34.

Although not particularly shown, a similar configuration is also adopted for the lower reel 35.

The upper reel 34 is preferably made of a metal material,
Utilizing the electrical conductivity of this material, stopping of the lower motor 37 that drives the lower rule 35 is controlled. That is, the switch contact 42 is placed in contact with the circumferential surface of the upper reel 34.
is provided. The belt 24 is usually made of glass fiber coated with, for example, tetrafluoroethylene resin in consideration of ease of peeling from the ceramic green sheet 20. That is, the belt 24 is insulating.

Therefore, the belt 24 wound on the upper reel 34
When the metal is removed, the switch contact 42
contact with the lower reel 34 and become electrically conductive, and in response, the winding operation of the lower reel 35 is stopped.
Controls stopping of the lower motor 37.

In addition to the control IIIM structure as described above, control units 43, 44 including limit switches, timers, etc. are provided to control rotation and stopping of the motors 36, 37, respectively.

FIG. 21 shows a mechanism for forming the loop portion 30 on the belt 24. As shown in FIG. The am for forming the annular portion 30 includes an arm 28 rotatably supported by the above-mentioned shaft 27 and a protruding member 29. A fluid cylinder 46 using air or oil as a driving source is used for the rotation. The cylinder 46 is rotatably supported on a suitable fixed surface, and its plunger 47 is rotatably connected to a connecting rod 48 fixedly provided to the arm 28 .

Therefore, by actuating the cylinder 46, via the plunger 47, the connecting rod 48 and the arm 28,
The protruding member 29 rotates about the shaft 27 in the direction of arrow 45.

FIG. 22 shows 1141 for changing the interval between the pair of guide rods 25, 26. Each guide bar 25.26 is preferably supported rotatably about an axis 4-9.50. In order to change the distance between the pair of guide bars 25, 26, it is sufficient to fix one guide bar and make only the other guide bar movable. Therefore, in this embodiment, the upper guide rod 25 is provided so as to be movable. That is, the shaft 49 for the upper guide rod 25 is provided at one end of an arm 52 that is rotatable about a fulcrum 51, and the plunger 54 of a cylinder 53 is connected to the other end of the arm 52. . Therefore, by actuating the cylinder 53, the arm 52 is swung, and the upper cover 25 can be moved between the position shown by the solid line and the position shown by the imaginary line.

As a result, the distance between the pair of guide cassettes 25 and 26 is changed.

FIG. 23 schematically shows the ceramic green sheet holding stand 31 and the core supply mechanism. This figure 23 and the above-mentioned figure 18
The holding table 31 and its related configuration will be described with reference to the drawings.

As shown in FIG. 18, the holding stand 31 has a stepped portion 55 for positioning the ceramic green sheet 2o.
Equipped with Therefore, the ceramic green sheet 20
is always properly positioned on the holding table 31 by bringing its negative side into contact with the stepped portion 55 . In this positioning state, one end of the ceramic green sheet 2o protrudes from the holding base 31.

A plurality of vacuum suction holes for vacuum suctioning the ceramic green sheet 2o are formed on the surface 56 of the holding table 31 that contacts the ceramic green sheet 2o. In addition, since this vacuum suction hole is a Ganari fR#III hole,
Not shown in the drawings.

Below such a holding stand 31, a tailstock plate 57 is provided.
is placed. On both sides of the tailstock plate 57, tailstock rods 58 extending beyond the upper surface of the holding base 31 are provided. This core push rod 58 is for transporting the core 23, as shown in FIG. 14 described above. The holding base 31 and the tailstock plate 57 are each independently moved in the direction indicated by the arrow 5 in FIG.
It is provided movably in 9 and 60 directions. Each movement is driven by a cylinder (not shown).

Referring to FIG. 23, a fixing bracket 62 is provided extending from the window wall 61. A first slide mechanism 63 is provided on this fixed bracket 62, and a tailstock plate 57 is attached thereon. The first slide machine @83 includes a lower stand 64 and an upper stand 65.
A plurality of rollers 66 are arranged between them. Therefore, the lower stand 64 and the upper stand 65 are relatively movable in a linear direction, and the tailstock plate 57 is accordingly movable in the direction of arrows 59 and 60 (FIG. 18) with respect to the fixed bracket 62. .

A second slide 1167 having the same configuration as the first slide mechanism 63 is also arranged on the tailstock plate 57, and the holding base 31 is placed on it.

FIG. 24 schematically shows a mechanism for dispensing the cores 23 one by one. This figure 24 is compared to figures 18 and 23.
The feeding mechanism for the core 23 will be described with reference to the drawings.

A plurality of leads 23 to be supplied are arranged in the vertical direction and stored in the lead storage container 68. The bottom of the lead storage container 68 forms an opening, and this opening is closed by a bushing plate 69 to prevent the lead 23 from falling out.

The button plate 69 is activated by the operation of the cylinder 70.
It is provided so as to be movable in the directions of arrows 71 and 72. Grooves 73 are formed on the upper surface of the button plate 69 to receive the cores 23 one by one. In this way, at the end of the movement of the bushing plate 69 in the direction of the arrow 72, one inch core 23 is received in the groove 73, and as it moves in the direction of the arrow 71, such a core 23 is brought to a predetermined position. Next, until the groove 73 is located directly below the lead storage device 68, the upper surface of the butcher plate 69 will hold the lead 23 from the lead storage device 68.
prevent falling.

The core 23 received in the groove 73 and carried to a predetermined position is attracted by a vacuum chuck 74.

The vacuum chuck 74 is II! Core 2 received within 73
3, lifts it from that position, moves it laterally and carries it above the ceramic green sheet 20 on the holding table 31, and here it is displaced downward and onto the ceramic green sheet 20. It is provided so as to be movable along the path along which the core 23 is dropped, and also along the opposite path to the path just described. More specifically, as shown in FIG. 23, for example, two rods 75 extend laterally from the vacuum chuck 74, and these rods 75 are slidably held through a block 76. For example, two rods 77 extend downward from the block 76, and these rods 77 are slidably held on appropriate fixing portions 78. Therefore, by applying a driving force to the rods 75 and 77, the vacuum chuck 74 performs the above-described movement. For the purpose of driving the rods 75 and 77, for example a cylinder (not shown) is used.

Next, the operations of the above-mentioned specific apparatus will be sequentially explained.

First, in the preparation stage, the lower motor 37 is turned on and the belt 24 is wound onto the lower reel 35 side.

Then, when the switch contact 42 comes into electrical contact with the upper reel 34, the lower motor 37 is stopped. During this time, the upper motor 36 is in an off state. Further, the holding base 31 and the tailstock plate 57 are at the end position of movement in the direction of the arrow 6°. The protruding member 29 is also kept at a distance from the belt 24. Furthermore, the vacuum chuck 74 has one core 23
While holding the button, the button is placed on standby at a position above the button plate 69.

After the preparation process as described above is completed, regular winding work of the ceramic green sheet 20 is started. First, the cylinder 46 is actuated to rotate the protrusion member 29, and the loop-shaped portion 30 is formed on the belt 24. After the annular portion 30 is formed, the protruding member 29 is again moved away by the actuation of the cylinder 46. Next, when the ceramic green sheet 20 is placed on the holding table 31, vacuum suction is started on the surface 56 of the holding table 31, and the ceramic green sheet 20 is firmly held on the holding table 31. At the same time, the holding base 31 moves in the direction of arrow 59,
Cut the tip of the ceramic green sheet 20 into a ring-shaped part 3"
Insert into the inner space of 0.

Next, the vacuum chuck 74 moves and drops the core 23 onto the ceramic green sheet 20. The vacuum chuck 74 that dropped the core 23 immediately returns to its original position, attracts the core 23 to be supplied next, and waits.

In response to ε when the vacuum chuck 74 drops the core 23 onto the ceramic green sheet 20, the core pushing plate 57 moves in the direction of the arrow 59. At this time, a pair of tail rods 5
8 carries the wick 23 into the looped portion 30 while contacting both ends of the wick 23. Even if it is carried inside the fa-shaped part 30,
The core 23 is placed on the top surface of the 20th ceramic green sheet.

Next, the upper guide rod 25 moves downward, and the pair of guide rods 2
Narrow the interval between 5 and 26. At the same time, the tailstock plate 5
7 leaves in the direction of arrow 60.

At the same time, the upper motor 36 is turned on and the up wheel 34 is rotated. In response to this rotation, belt 24 moves upward along its length. Accordingly, the ceramic green sheet 20 is rolled up on the core 23. When a predetermined period of time has elapsed since this rolling-in was started, the medical table 31 retreats in the direction of the arrow 60. While the upper motor 36 is rotating, the lower motor 37 is in an off state, and friction in the transmission mechanism from the lower motor 37 to the lower reel 35 provides advantageous tension to the bells 1 to 24. Upper motor 36
The upper motor 36 is stopped through the control section 43 after a certain period of time set by the timer has elapsed since the upper motor 36 started rotating. This time setting is determined depending on the length of the ceramic green sheet 20 to be rolled up. ``Also, at the final stage of rolling the ceramic green sheet 20,
τ, the heater 33 is driven, for example, by a cylinder, and moves so as to come into contact with the outer peripheral surface of the annular portion 30. Accordingly, adhesion at least at the end of the rolled ceramic green sheet 20 is achieved.

When winding is completed, the upper guide bar 25 moves upward and the distance between the pair of guide bars 25, 26 is widened.

Then, the down reel 35 rotates, and the belt 24 is wound onto the lower reel 35 side.

In response to this winding, the flag-shaped portion 30 passes between the pair of guide rods 25 and 26, causing the rolled ceramic green sheet 20 to fall. This fallen ceramic green sheet 20 is stored in a storage box (FIG. 18).

Thereafter, the process starting from driving the protruding member 29 described above is repeated, and one rolled ceramic green sheet 20 is produced each time one process cycle is completed.

As for the driving method of the belt 24, the following modification example can be considered. , the lower reel 35 was rotated to rewind the belt 24 onto the lower reel 35. In this case,
If the belt 24 is long enough, the lower reel 35
The unwinding of the belt 4 due to the rotation of the belt 4 is sufficient as long as the ring-shaped portion 30 is eliminated. Further, in order to eliminate the ring-shaped portion 30, the upper reel 34 may be rotated.

In this case, the winding cycle of a plurality of ceramic green sheets 20 is repeated only by the rotation of the upper reel 34, and when the belt 24 wound around the lower reel 35 is about to run out, the downward movement begins for the first time. 35 will be rotated. In all of the above-described driving methods for the belt 4, it is necessary to drive the bells 1 to 24 in the forward direction. However, if the belt 24 is endless, the bell 1 24 may be driven in only one direction. A schematic configuration using the endless belt 24 is shown in imaginary lines in FIG.

Referring to FIG. 19, when belt 24 is endless, upper reel 34 and lower reel 35 become mere rollers. Further, only the motor 36 for rotationally driving the upper roller 34 is required, and the motor 37 is not required. A tension roller 80 is used to apply the desired tension to the belt 24.
is added, and the belt 24 is numbered here. The tension roller 80 is biased by a spring 81 in a direction to give tension to the belt 24. However, this tension row 580 does not always act on the belt 24, but is applied to the cylinder 82, for example, so as to maintain the annular portion 30 when the ceramic green sheet is not being wound. By tension roller 8
It is configured to selectively realize a state in which 0 acts and a state in which it does not act.

FIGS. 25 and 26 each schematically show a mechanism for taking out the rolled ceramic green sheet 20 employed in another embodiment of the apparatus of the present invention. In each of the other embodiments shown here, consideration has been given to ensuring that the ring-shaped portion 30 once formed is not lost when the ceramic green sheet 20 is taken out.

Therefore, in subsequent steps, the step of forming the annular portion 30 is omitted.

In FIG. 25, the core 23 is as shown in FIG.
It has a length longer than the width of the ceramic green sheet 20, protrudes from the end face of the ceramic green sheet I-20, and is selected to have a length such that it protrudes from both sides of the belt 24. Therefore, the take-out arms 83 provided on both sides of the heald 24 can directly contact the core 23. The take-out arm 83 is rotatably supported around a shaft 84 . In order to drive this rotation, a cylinder 85 is provided, the cylinder 85 is rotatably held at a suitable fixed part, and the plunger 86 of the cylinder 85 is connected to the take-out arm 8.
3. In such a configuration, when the take-out arm 83 rotates counterclockwise due to the operation of the cylinder 85, the ceramic green sheet 2 is removed via the core 23.
0 is pushed out of the annulus 30 and the annulus 30 remains.

In FIG. 26, a case is shown in which the ceramic green sheet 20 within the ring-shaped portion 30 is extruded in the axial direction of the core 23 and taken out. A push rod 87 for this purpose is connected to a plunger 89 of a cylinder 88 . When the cylinder 88 is actuated, the pushing rod 87 comes into contact with the end surface of the core 23 and pushes the C1 ceramic green sheet 20 into the ring-shaped portion 30.
Exclude from Although the core 23 is shown by a dotted line in FIG. 26, this means that the length of the core 23 does not necessarily need to be longer than the width of the ceramic green sheet 20.

FIG. 27 shows the posture of the belt 24 and the method of inserting the ceramic green sheet 20 employed in yet another embodiment of the present invention. Here, the bells 1 to 24 are run horizontally, and a pair of guide rods 25.degree. 26 are arranged side by side. The annular portion 30 is formed to protrude downward.

When inserting the ceramic green sheet 20 into such an annular portion 30, the ceramic green sheet 20 is inserted from above, and in order to maintain the proper posture of the ceramic green sheet 20, the ceramic green sheet 20 is held by, for example, a vacuum suction device 90. be done. The core 23 is dropped on one side of such a ceramic green sheet 20. The principle of winding the ceramic green sheet 20 on the core 23 is the same as in the embodiment described above.

In connection with the embodiment of FIG. 27, the running direction of the belt 24 may be neither horizontal nor vertical, but may be in an inclined direction in between.

The rolled ceramic green sea 1- obtained as described above is, if necessary, rolled tightly by means such as pressurizing it in a liquid while having a core, and then fired.
Becomes an electronic component or an element for an electronic component. In addition to the capacitor, the target electronic component may be a coil, a ceramic heater, or other wound-type ceramic electronic component.

The core used for winding the ceramic green sheet becomes unnecessary once the winding is completed. Therefore, after winding up, it usually fails. Possible materials for the core include metal, plastic, and ceramic. If eyelid lamic is used as the material for the core, firing may be performed with the core remaining. In the case of this ceramic, it may be a fired ceramic (or a raw ceramic before firing).

Furthermore, the present invention also provides two
It is also applicable when two ceramic green sheets 2a, 2b are rolled up at the same time. In this case, two ceramic green sheets are laid together in advance,
Just load it into the device.

Effects of the Invention According to this invention, the ceramic green sheet can be rolled up using a belt while applying a pressing force toward the center over a range close to the entire circumference, so that an extremely tight and uniform rolled-up state can be achieved. can be obtained. Therefore,
After firing, selective defects such as delamination and deterioration of moisture resistance properties do not occur. Moreover, especially when applied to a capacitor, variations in capacitance are prevented.

In addition, according to the method of the present invention, the core is supplied after first positioning the ceramic green sheet with respect to the belt. Therefore, as long as the positioning of the ceramic green sheet with respect to the belt is performed accurately, a proper winding with uniform end surfaces can be achieved. It becomes possible to include In other words, it is easy to position the ceramic green sheet alone, and even if the core supplied later is misaligned in the width direction of the ceramic green sheet, the core can be easily positioned in the next process of applying tension to the belt. This is because they are forced into an aligned state.

Moreover, according to the apparatus of the present invention, automatic feeding of ceramic green sheets and cores becomes possible, which increases productivity.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a completed state of winding of a winding type ceramic capacitor as an example of a winding type ceramic electronic component. FIG. 2 is a sectional view taken along the line "G" in FIG. 1. 3 and 4 are plan views showing the internal electrode formation state applied to the first example of the ceramic green sheet used for manufacturing the capacitor shown in FIG. 1. FIG. FIG. 5 is a plan view showing the internal electrode formation state applied to the second example of the ceramic green sheet used for manufacturing the capacitor shown in FIG. 1. FIG. 6 is a sectional view taken along the line Vl--Vl in FIG. 1 in the example of FIG. 5. FIG. 7 is a plan view showing a state in which a conductive portion is formed in a ceramic green sheet used for manufacturing a wound-type ceramic coil as another example of a wound-type ceramic electronic component. FIG. 8 is a diagram illustrating a conventional winding method. FIG. 9 is a plan view showing a more practical state of forming internal electrodes on a ceramic green sheet used in manufacturing a wound type ceramic capacitor. FIG. 10 shows a state in which the ceramic green sheet of FIG. 9 is wound around the circumferential surface of the core. FIGS. 11 to 17 show an embodiment of the method of the present invention in the order of steps. 18th
The figure is a perspective view showing the arrangement of elements included in an embodiment of the device of the invention. FIG. 19 schematically shows the belt 24 and belt drive groove of the apparatus of FIG. 18. FIG. 20 shows the west side structure of the upper reel 34 for winding the belt 24. FIG. 21 shows a mechanism for forming the loop portion 30 on the belt 24. As shown in FIG. FIG. 22 shows a till for changing the distance between the pair of guide rods 25 and 26. FIG. 23 schematically shows the ceramic green sheet holding stand 31 and the core supply mechanism. FIG. 24 schematically shows a mechanism for dispensing the leads one by one. FIGS. 25 and 26 each schematically show a mechanism for taking out the rolled ceramic green sheet 20 employed in another embodiment of the apparatus of the present invention. Second
FIG. 7 shows the posture of the belt 24 and the method of inserting the ceramic green sheet 20 employed in yet another embodiment of the present invention. In the figure, 20 is a ceramic green sheet, 23 is a core, 24 is a belt, 25, 26 is a guide rod, 29 is a protruding member, 30 is a ring-shaped portion, 31 is a holding base, 34 is an upper reel, and 35 is a lower reel. , 36°37 is the motor, 46.5
3 is a cylinder, 52 is an arm, 57 is a tailstock plate,
Reference numeral 58 represents a tailstock, and reference numeral 74 represents a vacuum chuck. Patent applicant: Murata Manufacturing Co., Ltd. (and 2 others)

Claims (16)

[Claims] (1) In the method of winding ceramic green sheets onto the circumferential surface of a core, which is a process for manufacturing rolled-type ceramic electronic components, parts of the belt are bent, facing each other, and Passing between a pair of (a)-med surfaces extending in parallel with a predetermined interval, forming a ring-shaped portion projecting from between the pair of ()-med surfaces, and forming a ring-shaped portion in the inner space of the ring-shaped portion. L? Insert one end of the remic green sheet, place the core on one side of the ceramic green sheet within the inner space of the ring-shaped portion with its axial direction aligned with the width direction of the belt, and then The distance between the pair of kite surfaces is set so that the annular portion does not unravel when the core passes through the pair of kite surfaces even if tension is applied to the core, The belt is moved in the longitudinal direction relative to the pair of guide surfaces, and the core is rotated around its fill line (within the ring-like portion) of the belt. By this, the ceramic clean sheet is drawn into the annular part, and the ceramic clean sheet 1- is placed on the outer peripheral surface of the core while bringing the other direction of the ceramic green sheet into contact with the inner peripheral surface of the annular part. A method for winding a roll-type ceramic electronic component, the method comprising the steps of winding the core and taking out the ceramic green sheet rolled on the core from the ring-shaped portion. (2) The winding method according to claim 1, wherein the step of forming the Iyr ring-shaped portion is always carried out before starting the ponding step. (3) The step of taking out the wound ceramic green sheet includes the step of widening the distance between the pair of guide surfaces and applying tension to the belt to eliminate the loop-shaped portion. 'F The winding method according to claim 2. (4) The winding method according to claim 1, wherein the step of forming the ring-shaped portion is performed once, and then the other steps are repeated a plurality of times. (5) The winding method according to claim 4, wherein the step of taking out the rolled ceramic green sheet is performed while the ring-shaped portion is maintained. (6) A device for rolling a ceramic green sheet onto the circumferential surface of a core, which is used in one process for manufacturing rolled-type ceramic electronic components, comprising: a belt; a means for driving the belt in the longitudinal direction; a pair of guide bars located on one side of the belt, extending in the width direction of the belt 1- and spaced apart from each other; and means for changing the spacing between the pair of guide bars. and bending a part of the belt at a position corresponding to between the pair of guide bars, passing it between the pair of guide bars, and bending the belt so that the one side of the belt faces outward. means for forming an annular portion protruding from between the guide rods; a stand for holding the ceramic green sheet with its end protruding; means for moving the stand in order to insert the core into the annular portion from one side; and means for supplying the core to one side of the ceramic green sheet within the inner space of the annular portion. A winding device for winding-type ceramic electronic components. (7) Claim 6, wherein the belt is at the right end.
The winding device described in Section 1. (8) Claim 6, wherein the belt is endless.
The winding device described in Section 1. (9) The winding device according to claim 7, wherein each end of the belt is wound around a reel, and the means for driving the belt includes a motor that rotates the reel. (10) The winding device according to any one of claims 6 to 9, wherein each guide rod is rotatably held around its axis. (11) The device according to any one of claims 6 to 10, wherein the means for changing the distance between the pair of guide rods includes a fluid cylinder that displaces at least one of the guide rods. Winding device. (12) The means for forming the ring-like portion includes a rotatably provided arm and a protruding member attached to the end of the arm, and the means for forming the loop portion includes a protruding member having a mounting number attached to the end of the arm. The winding device according to any one of claims 6 to 11, wherein the ring-shaped portion is formed by pushing with a protruding member. (13) The winding device according to any one of claims 6 to 12, wherein the stand includes a stepped portion for positioning the ceramic green sheet. (14) The winding device according to any one of claims 6 to 13, wherein the stand is provided with a plurality of vacuum suction holes on a surface that contacts the ceramic green sheet. (15) The winding device according to any one of claims 6 to 14, wherein the means for moving the table includes a fluid cylinder. (16) The means for supplying the core includes means for dropping the core onto the ceramic green sheet, and means for transporting the dropped core along the ceramic green sheet from the inside to the side protrusion of the annular portion. A winding device according to any one of claims 6 to 15, comprising: