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(11) | EP 0 990 613 B9 |
| (12) | CORRECTED EUROPEAN PATENT SPECIFICATION |
| Note: Bibliography reflects the latest situation |
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| (54) |
Bobbin transfer tray Spulenübergabecaddy Palette pour le transfert de bobines |
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| Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention). |
[0001] The present invention relates to a bobbin transfer tray according to the preamble of claim 1.
[0002] Such a tray is known from DE-A-4110284. The spring means of this tray is a tube having a longitudinal slit and being helically bent. One of the side edges of the tube has a bent portion engaging into a slit of the peg.
[0003] The problem underlying the present invention is to provide a bobbin transfer tray having a structure that allows the spring means to be installed on the peg by one action and the tray to be assembled easily.
[0004] This problem is a accomplished by the features defined in the characterizing portion of claim 1.
[0005] The proposed structure allows both side edges of the spring plate to be fully inserted into the slits, so that sharp spring plate edges do not damage the lower end and inner circumferential surface of a core tube.
[0006] The middle area between the bent portions of the spring plates be curved along the outer circumferential surface of the peg, wherein the curvature at the top of the middle area of the spring plates is equal to that of the outer circumferential surface of the peg, and the curvature of the inner circumferential surface of the lower part differs from that of the outer circumferential surface of the peg.
[0007] Such a structure allows the lower part of the middle of spring plates to be tilted and fanned out in the length direction of the peg, and the lower part to be closed radially inward when the bobbin is fit, so that reactive force due to longitudinal deformation presses the bobbin. Because the lower part of the spring plates radially collapses from outside, thus deforming the plates in the circumferential direction when the bobbin is installed, the resulting reactive force also presses the bobbin.
Brief Description of the Drawing
[0008]
Figure 1 is a perspective view showing an embodiment of a bobbin transfer tray according to the present invention.
Figure 2 is a longitudinal section of a tray.
Figure 3 is the cross section of the tray, taken along line III-III in Figure 2.
Figure 4 is the cross section of the tray, taken along line IV-IV in Figure 2.
Figure 5 is a cross section of a tray with a bobbin installed, which is equivalent to the cross section taken along line IV-IV in Figure 2.
Figure 6 shows an unfinished spring plate.
Detailed Description of the Preferred Embodiments
[0009] Referring to the drawings, a preferred embodiment of the present invention is described below.
[0010] As shown in Figures 1 and 2, a bobbin transfer tray T, with a cylindrical peg 2 integrally provided in an upright position in the center of a discoid base 1, is adapted so that a core tube 3 of a bobbin B is fit over the peg 2 to support the bobbin B in an upright position. The base 1 and the peg 2 are formed integrally from plastic. At the lower end of the peg 2, a step 4 having a larger diameter than the peg 2 is provided, on top of which is positioned the lower end 5 of the core tube 3.
[0011] The top of the peg 2 is formed into a cone shape. A center hole 6 is drilled from below in the base 1 and peg 2. The hole provides a suction path to find a yarn end. A suction port 7 is provided to communicate through the top of the peg 2 with the center hole 6. When suction is provided through the center hole 6, with the bobbin fit over the peg 2, negative pressure propagates through the suction port 7 and core tube 3 to the top of the core tube 3, so that a yarn end at the top is sucked.
[0012] Pressing members in the form of spring plates 9 are provided to press the core tube 3 from inside on the outer circumferential surface 8 of the peg 2. The three spring plates 9 are installed along the circumferential direction of the peg 2 and curved in the circumferential direction so that the spring plates 9 almost entirely cover the lower part of the outer circumferential surface 8, with the upper part of the surface left partially uncovered.
[0013] The spring plates 9 are formed by curving rectangular stainless steel plates as shown in Figure 6. In particular, both of their side edges are bent at the chain lines over their entire length in the height direction, toward the side of the peg 2, to form bent portions 10 having a predetermined bend length L. The intermediate part 12 between the bent portions 10 is curved along the outer circumferential surface 8 of the peg 2, as described later.
[0014] As shown in Figures 3 and 4, slits 13 are formed in the peg 2 along its circumferential direction at intervals of 120 degrees. The slits 13 are intended for insertion of the bent portions 10 of the spring plates 9. The slits 13, which are formed from the bottom of the tray T to the top of the peg 2 along the axis of the tray T, extend into the center hole 6 of the peg. The slits 13 receive both side edges or the bent portions 10 of the spring plates 9, which extend over the entire length in the height direction of the spring plates 9. However, the slits 13 do into the center hole 6 of the peg 2 at the step 4, so that a predetermined wall thickness remains on the side of the outer circumference of the step 4. Because the radial thickness H of the peg 2 is greater than the bend length L of the bent portions 10, the slits 13 have a depth H from the outer circumference 8 that is greater than the bend length L.
[0015] As shown Figure 3, at the intermediate part 12 at the top 14 of the spring plates 9, the curvature R1 of the inner circumferential surface 20 of the spring plates 9 is equal to the curvature Ro of the outer circumferential surface 8 of the peg 2. Thus, the top 14 of the intermediate parts 12 of the spring plates 9 is in close contact at their top with the outer circumferential surface 8 of the peg 2. The bent portions 10 at the top 14 of the spring plates 9 are inserted into the slits 13, thus elastically holding the internal surfaces of the slits 13. The bent portions 10 at the top 14 therefore provide fixed portions 16 to be secured to the peg 2.
[0016] The spring plates 9 are so thin that the difference in level between the outer circumferential surface 8 of the peg 2 and the outer circumferential surface 17 of the spring plates 9 is virtually negligible. Because the depth H of the slits 13 is greater than the bend length L of the bent portions 10, the bent portions 10 do not enter the center hole 6 completely. Thus, there are no obstructions in the center hole 6 on which yarn may be caught.
[0017] As shown in Figure 4, the curvature R2 of the inner circumferential surface 20 of the spring plates 9 is smaller than the curvature Ro of the outer circumferential surface 8 of the peg 2 at the lower part 18 from the top 14 of the intermediate part 12 of the spring plates 12. Thus, the lower part 18 of the intermediate part 12 of the spring plates 9 is separated from the outer circumferential surface 8 of the peg 2, and both sides in the circumferential direction are in contact with the outer circumferential surface 8 of the peg 2. As described above, the bent portions 10 of the lower part 18 of the spring plates 9 is inserted into the slit 13. However, the bent portions 10 do not actually abut the inner surface 15 of the slit 13, and only the edge of the bent portions 10 is in contact with the inner surface 15. In this way, the lower part 18 is able to freely move radially and elastically deform to come in close contact with the peg 2.
[0018] Strictly speaking, the spring plates 9 are curved so that the curvature of their inner circumferential surface is exactly equal at the top to that of the outer circumferential surface 8 of the peg 2, and becomes progressively smaller in the downward direction. However, due to machining errors, the tops of the spring plates 9 are almost entirely secured in close contact with the outer circumferential surface 8 of the peg 2, and their lower parts are projected away from the outer circumferential surface 8 of the peg 2, so that the lower part can freely and elastically deform. As shown in Figures 1 and 2, after the spring plates 9 are installed, the spring plates 9 tilt and are farther from the peg 2 at their lower parts, so that the three spring plates 9 fan out along the length of the peg 2, thus forming a virtually tapered surface.
[0020] To assemble the tray T, it is only necessary to install the three spring plates 9 on the outer circumferential surface 8 of the peg 2. Holding the spring plates 9 against the outer circumferential surface 8 of the peg 2 and pressing the intermediate part 12 of the spring plates 9 causes the spring plates 9 to elastically deform, so that their curvature increases and both their bent portions 10 are inserted into the slits 13, thus bringing the spring plates 9 into close contact with the outer circumferential surface 8 of the peg 2. In this way, the spring plates, which can be inserted into the slots by one action, facilitate tray assembly and eliminate the difficult operations.
[0021] When the bobbin B is fit over the peg 2 from above to use the tray T, the inner circumferential surface 19 of the core tube 3 comes in contact with the outer circumferential surface 17 of the spring plates 9. Because there is little difference in level between the inner circumferential surface 8 of the peg 2 and the outer circumferential surface 17 of the spring plates 9, the bobbin B is not caught on its downward way.
[0022] As fitting of the bobbin B progresses, the lower parts 18 of the spring plates 9 are gradually pressed and deformed radially inwardly. The bobbin B finally rests against the step 4, thus completing the bobbin fitting.
[0023] Figure 5 shows the condition of the lower parts 18 of the spring plates 9 upon completion of fitting. Because the lower parts 18 of the spring plates 9, which are tilted and fanned out, close radially inwardly at their tops 14, the resulting reactive force presses the bobbin B from inside. The spring plates 9, when longitudinally deformed, provide pressure.
[0024] At the same time that the bobbin B is fit, the inner circumferential surface 19 of the core tube 3 radially collapses the spring plates 9 from outside at the outer circumferential surface 8 of the peg 2, so that they come in close contact with the peg 2. Because the curvature R2 of the inner circumferential surface of the spring plates 9 changes so that it equals the curvature Ro f the outer circumference of the peg 2, such deformation in the circumferential direction also provides a pressing force.
[0025] Because deformation in both the longitudinal and circumferential directions provides a pressing force, as described above, even a simple structure provides excellent bobbin supporting performance. The outer circumferential surface 17 of the spring plates 9 ensures stable support and prevents bobbin B vibration, because the outer surface 17 of the spring plates 9 comes in surface contact with the inner circumferential surface 19 of the core tube 3. The spring plates 9 are provided around almost the entire circumference of the peg 2, thus providing a pressing force due to surface contact with the entire circumference.
[0026] In Figure 5, when the core tube 3 collapses the spring plates 9, the inner circumferential surface 20 of the spring plates 9 comes in surface contact with the outer circumferential surface 8 of the peg 2. However, the spring plates 9 may be slightly away from the outer circumferential surface 8 of the peg 2. That is, the spring plates 9 serve their purpose if they can be deformed from their normal shape. In Figure 5, the inner circumferential surface 19 of the core tube 3 is also in close contact with the entire outer circumferential surface 17 of the spring plates 9. However, the inner circumferential surface 19 may be slightly away from the outer circumferential surface 17.
[0027] The curvature R2 of the inner circumferential surface of the spring plates 9 may normally be greater than the curvature Ro of the outer circumferential surface 8 of the peg 2. The curvature R2 therefore poses no problem if it differs from the curvature Ro. As shown in Figure 4, for the embodiment, the curvature R2 is smaller than the curvature Ro. Thus, the center of the spring plates 9 in the circumferential direction is the farthest point from the peg 2. However, if the curvature R2 is greater than the curvature Ro , both sides of the spring plates 9 are the farthest points from the peg 2. When the bobbin B is fit over the peg 2, the structure is as shown in Figure 5. In such a case, a pressing force is applied to the core tube 3 from both sides of the spring plates 9.
[0028] The sharp edges of the spring plates 9 do not damage the bottom 15 or the inner circumferential surface 19 of the core tube 3, because both side edges of the spring plates 9 and both their bent portions 10 completely enter the slits 13. In combination with this, the round comers of the spring plates 9 enable safer assembly and easy handling.
[0029] Because the bent portions 10 do not protrude into the center hole 6, there are no obstructions in the center hole 6, thus ensuring a stable suction. In addition, a yarn end can be smoothly removed from the center hole 6 if it has entered the hole. In such a case, if the yarn end penetrates the center hole 6 relatively deeply, the yarn end is easy to remove because it does not escape through the slits 13.
1. A bobbin transfer tray (T) having a peg (2) in an upright position in the centre of
a disk shaped base (1) to receive a core tube (3) of a bobbin (B) fit over the peg
(2) comprising a spring means received on the peg and engaging rotationally fixed
in the circumferential direction but removably into the peg (2) characterized by at least one curved spring plate (9) both side edges of which form bent portions
(10) engaging resiliently into longitudinal slits (13) of the peg (2), and characterized in that the curvature (R2) of the inner circumferential surface of the spring plate (9) is
smaller than the curvature (R0) of the outer circumferential surface (8) of the peg
(2) at the lower part (18) of the spring plate (9).
2. A bobbin transfer tray according to claim 1, wherein the bent portions (10) and slits
(13) are formed over the entire length of the spring plate (9) in the height direction,
and both side edges of the spring plate are fully insertable into the slits.
3. A bobbin transfer tray according to claim 1 or 2, wherein the spring plate (9) is
curved so that the curvature of its inner circumferential surface is equal at the
top to that of the outer circumferencial surface (8) of the peg (2), and becomes progressively
smaller in the downward direction.
4. A bobbin transfer tray according to on of the claims 1 to 3, wherein the depth of
the slits (13) from the outer circumferencial surface of the peg is greater than the
length of the bent portions (10) of the spring plate (9).
1. Spulentransportteller (T) mit einem Zapfen (2) in aufrechter Position in der Mitte
einer scheibenförmigen Basis (1) zur Aufnahme eines Kernrohrs (3) einer Spule (B),
die auf den Zapfen (2) aufgesetzt ist, bestehend aus einer Federeinrichtung, die im
Zapfen aufgenommen und drehfest in Umfangsrichtung, jedoch abnehmbar in den Zapfen
(2) eingreift,
gekennzeichnet durch
wenigstens eine gebogene Federplatte (9), deren beide Seitenkanten abgebogene Abschnitte (10) bilden, die federnd in Längsschlitze (13) des Zapfens (2) eingreifen, und dadurch, dass
die Krümmung (R2) der Innenumfangsfläche der Federplatte (9) kleiner als die Krümmung (R0) der Außenumfangsfläche (8) des Zapfens (2) am unteren Teil (18) der Federplatte (9) ist.
gekennzeichnet durch
wenigstens eine gebogene Federplatte (9), deren beide Seitenkanten abgebogene Abschnitte (10) bilden, die federnd in Längsschlitze (13) des Zapfens (2) eingreifen, und dadurch, dass
die Krümmung (R2) der Innenumfangsfläche der Federplatte (9) kleiner als die Krümmung (R0) der Außenumfangsfläche (8) des Zapfens (2) am unteren Teil (18) der Federplatte (9) ist.
2. Spulentransportteller nach Anspruch 1, bei dem die abgebogenen Abschnitte (10) und
die Schlitze (13) über die gesamte Länge der Federplatte (9) in Höhenrichtung gebildet
sind, und beide Seitenkanten der Federplatte vollständig in die Schlitze einsetzbar
sind.
3. Spulentransportteller nach Anspruch 1 oder 2, bei dem die Federplatte (9) derart gebogen
ist, dass die Krümmung ihrer Innenumfangsfläche am oberen Ende gleich der Außenumfangsfläche
(8) des Zapfens (2) ist und nach unten fortschreitend kleiner wird.
4. Spulentransportteller nach einem der Ansprüche 1 bis 3, bei dem die Tiefe der Schlitze
(13) von der Außenumfangsfläche des Zapfens aus größer als die Länge der abgebogenen
Abschnitte (10) der Federplatte (9) ist.
1. Palette (T) pour le transfert de bobine ayant une broche (2) dans une position verticale
au centre de la base en forme de disque (1) pour recevoir un tube central (3) d'une
bobine (B) fixée sur la broche (2) comprenant un moyen de ressort logé sur la broche
et s'engageant en rotation et fixé dans la direction circonférentielle mais de manière
amovible dans la broche (2) caractérisée par au moins une plaque ressort incurvée (9) dont les deux bords latéraux forment des
portions pliées (10) s'engageant de manière élastique dans des fentes longitudinales
(13) de la broche (2) et caractérisée en ce que la courbure (R2) de la surface circonférentielle de la plaque ressort (9) est plus
petite que la courbure (RO) de la surface circonférentielle externe (8) de la broche
(2) sur la partie inférieure (18) de la plaque de ressort (9).
2. Palette pour le transfert de bobine selon la revendication 1, dans laquelle les parties
pliées (10) et les fentes (13) sont formées sur toute la longueur de la plaque ressort
(9) dans la direction de la hauteur et les deux bords latéraux de la plaque ressort
sont complètement insérables dans les fentes.
3. Palette pour le transfert de bobine selon la revendication 1 ou 2, dans lequel la
plaque ressort (9) est incurvée de sorte que la courbure de sa surface circonférentielle
interne est égale en haut à celle de la surface circonférentielle externe (8) de la
broche (2) et devient progressivement plus petite dans la direction descendante.
4. Palette pour le transfert de bobine selon l'une des revendications 1 à 3, dans laquelle
la profondeur des fentes (13) á partir de la surface circonférentielle externe de
la broche est supérieure à la longueur des parties pliées (10) de la plaque ressort
(9).