JP4315947B2 - Needle clasp in needle punch machine - Google Patents

Description

  The present invention relates to a needle clamp of a needle punch machine for fixing a nonwoven material such as felt or wool on a base material made of fabric.

  In general, a needle punch machine has a needle holder attached to the lower end of a needle bar that is moved up and down, and a base material made of a cloth on which a plurality of punch needles implanted in the needle holder are placed on a needle plate, The non-woven material such as felt placed on top is pierced, and the non-woven material is entangled with the base material on the barb (thorn) formed on each punch needle to fix the non-woven material. Yes.

  Here, the punch needle, like a generally known felt needle, has a configuration in which a blade portion is provided at the tip of the shank portion, and a plurality of barbs are formed at intervals in the length direction of the blade portion. Has been.

  The punch needle is usually detachably attached to the base so that when the punch needle is broken, the broken punch needle can be replaced with a new punch needle.

  As a needle clamp with a punch needle detachably attached thereto, one described in Patent Document 1 has been known. The needle holder described in Patent Document 1 forms a plurality of vertical holes arranged at equal intervals in the width direction of the pedestal at intervals in the length direction of the pedestal, and is arranged from the side surface of the pedestal in the width direction of the pedestal. Punch needles that are provided with screw holes having closed ends so as to penetrate through the plurality of vertical holes, screw the same number of set screws as the plurality of vertical holes, and are inserted into the vertical holes by tightening the set screws. And the punch needle can be replaced by loosening the set screw.

  By the way, in the above-mentioned needle clamp, since a plurality of punch needles are individually fixed by tightening a set screw, it is necessary to attach and remove the set screw when replacing the punch needle. There is a disadvantage that it takes time and effort. In particular, when replacing the punch needle fixed to the vertical hole on the closed end side of the screw hole, it is necessary to remove the set screw and punch needle in front of the punch needle.

  In order to eliminate such an inconvenience, the applicant of the present application has proposed a needle holder in which a punch needle can be easily replaced in Patent Document 2. In the needle holder described in Patent Document 2, a plurality of needle insertion holes opened on the lower surface of the pedestal attached to the lower end of the needle bar and lateral holes crossing each needle insertion hole are formed. An elastic body is attached inside, a shank insertion hole communicating with each needle insertion hole is formed in the elastic body, and the shank portion of the punch needle is press-fitted into the shank insertion hole from the needle insertion hole, and the shank portion is elastically formed. The body is elastically held.

In the needle holder, the punch needle can be pulled out by pulling it down, so that the punch needle can be easily inserted into and removed from the shank insertion hole, and the punch needle can be easily replaced due to breakage or the like. It has the feature that it can.
Japanese Patent Laid-Open No. 11-350328 JP 2004-308058 A

  By the way, in the needle clamp described in Patent Document 2, since the shank portion of the punch needle is elastically held by an elastic body, the base material and the non-woven material when the friction resistance of the base material against the punch needle is large. There is a possibility that the punch needle may fall out of the shank insertion hole when the punch needle is raised after piercing into the pierce, and there are still points to be improved.

  An object of the present invention is to provide a needle holder for a needle punch machine that can easily replace punch needles and reliably prevent the punch needles from falling off.

  In order to solve the above problems, in the present invention, a needle holder having a head fitting hole on the upper side and a plurality of shank insertion holes penetrating from the lower surface to the head fitting hole, and the needle holder A punch head having a holder head that is detachably fitted in the head fitting hole and a large-diameter head that is inserted into the shank insertion hole from the head fitting hole and supported by the bottom surface of the head fitting hole. And a coupling means for detachably coupling the holder head and the needle holder while the holder head fitted in the head fitting hole presses the head of the punch needle.

  Here, as the coupling means, a screw hole penetrating from the upper outer periphery of the needle holder to the head fitting hole is formed, and the holder head and the needle holder are coupled by tightening the coupling screw screw-engaged with the screw hole. It is possible to adopt what has been made.

  In this case, a conical portion is provided at the tip of the coupling screw, and the conical portion can be inserted into the outer periphery of the holder head, and a conical recess that presses the holder head toward the bottom surface of the head fitting hole during the insertion. If it is provided, the holder head is pushed down by tightening the coupling screw, and the head of the punch needle can be securely clamped from above and below by the holder head and the needle holder. For this reason, the stable attachment state in which a punch needle does not move up and down can be obtained.

  In the use of attaching the needle holder according to the present invention to the lower end of the needle bar that is moved up and down, if the head fitting hole is provided at a position eccentric from the center of the holder head to the presser bar provided behind the needle bar When attaching the needle clamp to the lower end of the needle bar, the needle holder interferes with the presser bar by attaching the thin wall portion of the peripheral wall of the head fitting hole to the presser bar provided behind the needle bar. Therefore, it is possible to form a head fitting hole having a large diameter with respect to the needle holder. As a result, a large number of shank insertion holes can be formed in the needle holder, and a large number of punch needles can be held.

  In the needle holder having the above configuration, the punch needle can be pulled out above the needle holder by releasing the coupling between the holder head and the needle holder and pushing up the punch needle. The punch needle can be easily attached and detached, and the broken punch needle can be easily replaced with a new punch needle.

  In addition, after inserting the punch needle into the shank insertion hole from above the needle holder, the holder head is fitted into the head fitting hole, and the holder head and the needle holder are coupled to each other so that the bottom wall of the head fitting hole is obtained. Since the head of the punch needle can be clamped from above and below by the holder head, the punch needle can be securely fixed.

  For this reason, even when a large frictional resistance is applied to the punch needle when the punch needle is pulled through the base material and the nonwoven material, there is no inconvenience that the punch needle falls off.

  Furthermore, since the punch needle is attached by sandwiching the head of the punch needle from above and below between the bottom wall of the head fitting hole and the holder head, and no screws are used, the punch needles can be provided with high density.

  Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a needle plate 2 is attached to a bed 1 in a needle punching machine, and a separator 4 is attached to the lower end of a presser bar 3 provided on the needle plate 2 so as to be movable in the axial direction. .

  The presser bar 3 is moved up and down by a knob operation (not shown). By the vertical movement, the height of the separator 4 is adjusted according to the thickness of the base material A placed on the needle plate 2 and the non-woven material a superimposed on the base material A. The separator 4 is provided with an insertion hole 4a for a punch needle N described later.

  A needle bar 5 that can be moved up and down is provided on the needle plate 2, and a needle holder 10 is attached to the lower end of the needle bar 5. The needle holder 10 moves up and down together with the needle bar 5, and when lowered, the plurality of punch needles N held by the needle holder 10 pierce the base material A and the non-woven material a held by the separator 4. Yes. For this reason, the separator 4 is formed with holes 4a through which the punch needles N are inserted.

Here, the punch needle N, as shown in FIG. 2 (I) and (II), of smaller diameter at the distal end of the shank portion n ₁ the blade portion n ₂ is provided, and the large diameter at the rear end of the shank portion n ₁ forming a head n _3, has a configuration in which a plurality of barbs (not shown) in the blade portion n _2.

In forming the head n ₃ , here, as shown in FIG. 4 (I), a collar is fitted to the shank portion n ₁ and integrated by means such as adhesion, and the collar is used as the head n ₃ . as shown in 4 (II), fitted cap on the shank portion n _1, integrated by bonding or press fitting may be the cap as head n _3. Further, the rear end of the shank portion n ₁ may be by press molding provided with a large diameter head.

  2 (I) and (II), the needle holder 10 includes a columnar holder head 11 attached to the lower end of the needle bar 5, and a needle holder 12 coupled to the holder head 11. The holder head 11 is formed with an insertion hole 13 into which the lower end portion of the needle bar 5 is inserted, and a screw hole 14 that penetrates the insertion hole 13 from the upper part of the outer peripheral surface. A conical recess 15 is provided on the outer peripheral surface of the holder head 11 below the screw hole 14.

  The holder head 11 is fitted to the lower end portion of the needle bar 5 and is detachably attached to the lower end portion of the needle bar 5 by tightening a set screw 16 screwed into the screw hole 14. In this case, the holder head 11 is attached to the lower end portion of the needle bar 5 so that the set screw 16 is positioned in front.

  The needle holder 12 has a cylindrical shape, and a head fitting hole 17 is formed on the upper surface of the needle holder 12 at an eccentric position with respect to the center. The needle holder 12 is formed with a plurality of shank insertion holes 18 penetrating from the lower surface to the head fitting hole 17.

Shank insertion hole 18, a shank portion n ₁ of the punch needle N is sized to be inserted with a slight margin. As shown in FIG. 3, the plurality of shank insertion holes 18 are formed at equal intervals on the center of the bottom surface of the head fitting hole 17 and two virtual circles having different diameters centered on the center of the bottom surface. A space slightly larger than the outer diameter of the head n ₃ of the punch needle N is provided between the shank insertion holes 18 adjacent in the radial direction and the circumferential direction of the fitting hole 17.

  A screw hole 19 is formed in the thick wall portion of the peripheral wall of the head fitting hole 17 so as to correspond to the recess 15 formed in the holder head 11, and a coupling screw 20 that is screw-engaged with the screw hole 19. A conical portion 21 that can be fitted to the concave portion 15 is provided at the tip of each of the two.

Here, the screw hole 19 and the recess 15 are in a state in which the holder head 11 is fitted into the head fitting hole 17 and the holder head 11 presses the head n ₃ of the punch needle N inserted into the shank insertion hole 18. The height of the recess 15 is set slightly higher than the screw hole 19.

  Positioning means 22 is provided between the holder head 11 and the needle holder 12 for positioning the screw hole 19 and the recess 15 in the circumferential direction when the holder head 11 is fitted into the head fitting hole 17.

  As shown in FIGS. 2 and 3, the positioning means 22 forms a notch 23 that opens on the upper surface of the needle holder 12 in the peripheral wall of the head fitting hole 17, and a pin 24 that penetrates the holder head 11 in the radial direction. The both ends of the pin 24 are fitted into the notch 23 to position the screw hole 19 and the recess 15 in the circumferential direction.

The needle holder shown in the embodiment has the above-described configuration. When the punch needle N is attached, the punch needle N is inserted into the shank insertion hole 18 from above the needle holder 12. At this time, the punch needle N bar blade portion n ₂ is inserted into the shank insertion hole 18 first, and the punch needle N is inserted to a position where the head n ₃ of the punch needle N is supported by the bottom surface of the head fitting hole 17. After that, the holder head 11 is fitted into the head fitting hole 17 so that the pin 24 fits into the notch 23, and the coupling screw 20 is screwed into the screw hole 19 and tightened.

Here, when the holder head 11 is fitted into the head fitting hole 17 and the head n ₃ of the punch needle N is pressed by the holder head 11, the recess 15 formed in the holder head 11 is slightly higher than the screw hole 19. Therefore, when the coupling screw 20 is tightened, the conical portion 21 at the tip of the coupling screw 20 presses the inner surface of the recess 15 downward.

Thus, the holder head 11 will be pressed against the head n ₃ of the punch needle N is pushed down to the bottom surface of the head fitting hole 17, the head n ₃ of the punch needle N is the holder head 11 and the head fitting hole 17 It is possible to obtain an extremely stable attachment state that is sandwiched from above and below and does not move in the vertical direction.

  The number of punch needles N is determined according to the size and design of the non-woven material a placed on the base material A.

  After the punch needle N is attached, the holder head 11 is fitted to the lower end portion of the needle bar 5 shown in FIG. 1, the needle holder 10 is fixed by tightening the set screw 16, and then the needle bar 5 is moved up and down. When descending, a plurality of punch needles N are pierced into the base material A and the non-woven material a pressed by the separator 4, and at the time of the piercing, the fibers of the non-woven material a are engaged with the barbs and pushed into the base material A. The nonwoven material a is fixed to the base material A by the entanglement of the fibers with respect to the base material A.

When the punch needle N is raised after the piercing of the base material A and the non-woven material a, the base material A and the non-woven material a are prevented from being pulled up by the separator 4. Further, when the punch needle N is raised, a frictional resistance is applied to the punch needle N, but the head n ₃ of the punch needle N is attached by being sandwiched from above and below by the holder head 11 and the bottom surface of the head fitting hole 17. Therefore, there is no inconvenience of falling off from the shank insertion hole 18.

Here, the blade portion n ₂ of the punch needle N is extremely thin, since the thickness of the formation position of the barbs formed in the blade portion n ₂ are thin-walled, the blade unit n to the base material A and the nonwoven material a _The punch needle N may break due to repeated piercing of ₂ . In this case, it is necessary to replace the broken punch needle N with a new punch needle N.

  When replacing the punch needle N, the coupling screw 20 is loosened, the coupling of the needle holder 12 to the holder head 11 is released, the broken punch needle N is pushed up and taken out onto the needle holder 12, and a new punch needle N is removed. Insert into the shank insertion hole 18 from above the holder 12. After the replacement of the punch needle N, the needle holder 12 is fitted into the holder head 11 and the coupling screw 20 is tightened to fix the needle holder 12.

  Thus, by releasing the coupling of the needle holder 12 to the holder head 11, the punch needle N can be inserted into and removed from the shank insertion hole 18, so that the punch needle N can be replaced very easily.

  In the embodiment, a needle clamp is attached to the lower end portion of the needle bar 5 and the punch needle N is pierced through the base material and the non-woven material by moving the needle bar 5 up and down. A needle holder may be attached and the punch needle N may be manually fed to the base material and the nonwoven material.

Side view of a needle punching machine to which a needle clamp according to the present invention is attached (I) Longitudinal front view of needle holder, (II) Cross-sectional view along line II in FIG. 2 (I) Sectional view along the roll line in FIG. (I) Cross-sectional view showing the head of the punch needle, (II) Cross-sectional view showing another example of the head Exploded perspective view of needle holder

Explanation of symbols

11 Holder head 12 Needle holder 15 Recess 17 Head fitting hole 18 Shank insertion hole 19 Screw hole 20 Coupling screw 21 Conical part N Punch needle n ₃ head

Claims (4)

A needle holder having a head fitting hole on the upper side and a plurality of shank insertion holes penetrating from the lower surface to the head fitting hole;
A holder head detachably fitted in a head fitting hole of the needle holder;
A punch needle having a large-diameter head at the top, which is inserted into the shank insertion hole from the head fitting hole and supported by the bottom surface of the head fitting hole;
Coupling means for detachably coupling the holder head and the needle holder in a state where the holder head fitted in the head fitting hole presses the head of the punch needle;
Needle clasp in a needle punch machine consisting of   The needle clamp according to claim 1, wherein the coupling means includes a screw hole penetrating from the upper outer periphery of the needle holder to the head fitting hole, and a coupling screw engaged with the screw hole.   A conical portion is provided at the tip of the coupling screw, and the conical portion can be inserted into the outer periphery of the holder head, and a conical recess is provided to press the holder head toward the bottom surface of the head fitting hole when the holder is inserted. A needle clamp in the needle punching machine according to claim 2.   The needle clamp in the needle punch machine according to any one of claims 1 to 3, wherein the head fitting hole is provided at a position eccentric from a center of the holder head toward a presser bar provided on the rear side of the needle bar.

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