Grease supply structure for sewing machine hook

Abstract

To achieve a grease supply structure for a sewing machine hook which can suitably supply grease.SOLUTION: In a grease supply structure 100 for a sewing machine hook, when a shuttle race 1 is rotated along with a hook shaft 10 by operation to actuate a sewing machine, grease G is fed out to a grease supply channel 12 from a grease storage part 11 by centrifugal force caused by the rotation of the shuttle race 1, and the grease G fed out to the grease supply channel 12 reaches a race groove 1a through a through-hole 5a of a core material 5, and the grease G is supplied to a sliding part (the race groove 1a, a race projection 2a) of the sewing machine hook 3. In particular, the through-hole 5a of the core material 5 disposed in the grease supply channel 12 has a branch shape in which a shaft vertical section shape is branched to a plurality of parts, therefore, the grease G passes through the narrow through-hole 5a bit by bit. Consequently, an adequate amount of the grease G can be supplied to the sliding part (the race groove 1a, the race projection 2a) of a sewing machine hook 3.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a grease supply structure for a sewing machine hook, which supplies grease to a sliding portion of the sewing machine hook.

Background Art

[0002] Conventionally, a grease supply structure for a sewing machine hook is known in which grease is supplied to a sliding portion where an outer hook and an inner hook constituting the sewing machine hook slide relative to each other, thereby suppressing heat generation, seizure, and wear of the sewing machine hook (see, for example, Patent Document 1). This grease supply structure for a sewing machine hook has a grease storage portion provided in the outer hook. The grease storage portion includes an inner storage portion filled with grease, an outer storage portion near the sliding portion, and a communication storage portion that communicates the inner storage portion and the outer storage portion. When the outer hook is rotated, grease is sent from the inner storage portion to the outer storage portion through the communication storage portion by centrifugal force, and grease is supplied to the sliding portion between the outer hook and the inner hook. In at least a part of the outer storage portion, an oil guiding member made of fiber such as felt is disposed to adjust the amount of grease supplied to the sliding portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the case of the technology of Patent Document 1 described above, the fiber density of the oil guiding member may vary due to the pushing pressure or the like when the fiber oil guiding member is disposed in the outer storage portion. For example, when the fiber density of the oil guiding member is high, the amount of grease supplied may decrease. Since grease is a semi-solid substance in which the base oil is dispersed by a thickener, if the oil guide member has too high a fiber density, it becomes difficult for the thickener component to pass through, resulting in a problem that the supply amount of grease becomes too small.

[0005] An object of the present invention is to provide a grease supply structure for a sewing machine bobbin case that can suitably supply grease.

Means for Solving the Problems

[0006] In order to solve the above problems, the invention according to claim 1 is A grease supply structure for a sewing machine bobbin case having an outer bobbin connected to one end of a bobbin shaft and rotated in a predetermined direction, and an inner bobbin rotatably installed in the outer bobbin, the grease being supplied to a sliding portion where the outer bobbin and the inner bobbin slide relative to each other, The outer bobbin is provided with a grease storage portion filled with the grease and a grease supply path for guiding the grease from the grease storage portion to the sliding portion, At least a part of the grease supply path is provided with a core material along the grease supply path, The core material is characterized in that at least one narrow through hole is provided along the axial direction of the core material.

[0007] The invention according to claim 2 is the grease supply structure for a sewing machine bobbin case according to claim 1, The axial vertical cross-sectional shape of the through hole is characterized by presenting a branched shape in a state of being branched into a plurality.

[0008] The invention according to claim 3 is the grease supply structure for a sewing machine bobbin case according to claim 1, A plurality of the through holes are provided in the core material, The axial vertical cross-sectional shape of the through hole is characterized by presenting a substantially circular shape.

[0009] The invention according to claim 4 is the grease supply structure for a sewing machine bobbin case according to any one of claims 1 to 3, The grease storage portion is provided at a position outside the rotation center of the pot axis in the outer pot, and is configured such that the grease is sent out from the grease storage portion and supplied to the sliding portion by the centrifugal force accompanying the rotation of the outer pot.

[0010] The invention according to claim 5 is the grease supply structure of the sewing machine pot according to any one of claims 1 to 3, wherein the core material is a member made of plastic.

Effect of the Invention

[0011] According to the present invention, grease can be suitably supplied to the sewing machine pot.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiment for Carrying Out the Invention

[0013] Hereinafter, embodiments of the present invention will be described in detail. The grease supply structure of the sewing machine pot is for suppressing heat generation and seizure of the sewing machine pot disposed inside the sewing machine bed portion and below the needle plate, and for supplying grease to the sliding portion where the outer pot and the inner pot constituting the sewing machine pot slide relative to each other.

[0014] The grease supply structure 100 of the sewing machine bobbin case according to the present embodiment is, for example, as shown in FIG. 1, in a sewing machine bobbin case 3 having an outer bobbin 1 connected to one end of a bobbin shaft 10 and rotated in a predetermined direction, and an inner bobbin 2 rotatably installed inside the outer bobbin 1. Grease G is supplied to a sliding portion of the sewing machine bobbin case 3 where the outer bobbin 1 and the inner bobbin 2 slide relative to each other.

[0015] As will be described later, a race groove 1a is provided on the inner peripheral surface of the outer bobbin 1, and a race projection 2a is provided on the outer peripheral surface of the inner bobbin 2. A portion where the race projection 2a of the inner bobbin 2 is in sliding contact with and rotatably fitted into the race groove 1a of the outer bobbin 1 is the sliding portion of the sewing machine bobbin case 3. That is, the race groove 1a of the outer bobbin 1 and the race projection 2a of the inner bobbin 2 are the sliding portion of the sewing machine bobbin case 3, and grease G is supplied to a portion where the race groove 1a and the race projection 2a are rotatably fitted.

[0016] The bobbin shaft 10 is a drive shaft that is rotated by a sewing machine motor (not shown) and rotates the outer bobbin 1 connected to one end portion 10a thereof. The bobbin shaft 10 is rotatably supported by a shaft metal portion 20 via a bearing 20a.

[0017] The outer bobbin 1 is a part that houses the inner bobbin 2, and a race groove 1a is provided on its inner peripheral surface. The inner bobbin 2 is a part that houses a bobbin and a bobbin case (not shown), and a race projection 2a is provided on its outer peripheral surface. The race projection 2a of the inner bobbin 2 is in sliding contact with and rotatably fitted into the race groove 1a of the outer bobbin 1, and the sewing machine bobbin case 3 is assembled.

[0018] The outer bobbin 1 is provided with a grease storage portion 11 filled with grease G, and a grease supply path 12 that guides grease G from the grease storage portion 11 to the sliding portion of the sewing machine bobbin case 3. The grease supply path 12 is provided outside the grease storage portion 11 in the outer bobbin 1.

[0019] As shown in FIGS. 1 and 2, the grease storage portion 11 is provided at a position outside the rotation center of the kettle shaft 10 in the outer kettle 1. Here, the grease storage portion 11 is provided at the base portion where the outer kettle 1 is connected to the kettle shaft 10. This grease storage portion 11 has a cylindrical space with an inner diameter of 5 mm. Since this grease storage portion 11 is outside the rotation center of the kettle shaft 10 in the outer kettle 1, the grease G is sent out from the grease storage portion 11 to the grease supply path 12 by the centrifugal force accompanying the rotation of the outer kettle 1.

[0020] In addition, the grease storage portion 11 is provided with a replenishment port 11a for replenishing the grease G, and a lid screw 11b that functions as a lid for the grease storage portion 11 is screwed to the replenishment port 11a. When replenishing the grease G into the grease storage portion 11, the lid screw 11b is temporarily removed from the replenishment port 11a. The replenishment port 11a of this grease storage portion 11 is provided on the outer peripheral surface side of the base portion of the outer kettle 1. By doing so, the grease G can be replenished into the grease storage portion 11 without removing the outer kettle 1 from the kettle shaft 10.

[0021] As shown in FIGS. 1 and 3(a), the grease supply path 12 is an elongated flow path that communicates with the race groove 1a from the grease storage portion 11. The grease supply path 12 of the present embodiment is a flow path that is bent in a substantially Z shape when viewed from the side. At least a part of this grease supply path 12 is provided with a core material 5 having a through hole 5a along the grease supply path 12. Here, the core material 5 is provided at a position closer to the race groove 1a in the grease supply path 12. The inner diameter of the grease supply path 12 of the present embodiment is 1.0 mm, and a core material 5 with a diameter of 0.8 mm to 1.0 mm and a length of 4.0 mm is arranged in the grease supply path 12 by adhesion or press-fitting.

[0022] The core material 5 is a plastic member, and at least one narrow through-hole 5a is provided in the core material 5 along the axial direction of the core material 5. In the core material 5 of the present embodiment, one through-hole 5a is provided, and the axial perpendicular cross-sectional shape of the through-hole 5a exhibits a branched shape in a mode of being branched into a plurality of branches as shown in FIGS. 3(b) and 3(c). Here, the branched shape is a mode of being branched into a plurality of branches so as to exhibit a substantially F shape as shown in FIGS. 3(b) and 3(c), and six substantially F-shaped portions are arranged radially. For such a narrow through-hole 5a having such a branched shape, the grease G can pass through little by little, and it becomes possible to supply an appropriate amount of the grease G to the sliding portions (race groove 1a, race projection 2a) of the sewing machine bobbin 3. For example, if the width of this narrow through-hole 5a is about 0.1 mm (about 100 μm), the thickener component of the grease G will not be clogged, and the grease G will pass through little by little. The width of the through-hole 5a here corresponds to the width of each branch whose axial perpendicular cross-sectional shape exhibits a substantially F shape.

[0023] In addition, the plastic core material 5 will not be crushed like the oil-conducting member made of fiber in the prior art, and the shape of the through-hole 5a of the core material 5 will not be narrowed. Therefore, the supply amount of the grease G to the sliding portions (race groove 1a, race projection 2a) of the sewing machine bobbin 3 will not vary, and the supply of the grease G can be stably performed. Note that the branched shape of the through-hole 5a of the core material 5 is not limited to the illustrated shape, and any other shape may be used as long as it can allow the grease G to pass through little by little.

[0024] In the grease supply structure 100 of the sewing machine bobbin of the present embodiment having such a configuration, when the outer bobbin 1 is rotated together with the bobbin shaft 10 by an operation of operating the sewing machine, the grease G is sent from the grease storage portion 11 to the grease supply passage 12 by the centrifugal force accompanying the rotation of the outer bobbin 1, and the grease G sent to the grease supply passage 12 reaches the race groove 1a through the through hole 5a of the core material 5, and the grease G is supplied to the sliding portion (race groove 1a, race protrusion 2a) of the sewing machine bobbin 3.

[0025] And since the through hole 5a of the core material 5 disposed in the grease supply passage 12 has a branched shape in which the shape of its axial vertical cross section is branched into a plurality of parts, the grease G passes through the narrow through hole 5a little by little, and an appropriate amount of grease G can be supplied to the sliding portion (race groove 1a, race protrusion 2a) of the sewing machine bobbin 3. In particular, by using the plastic core material 5, it is easier to maintain the shape of the axial vertical cross section of the through hole 5a of the core material 5, so that the supply amount of the grease G to the sliding portion (race groove 1a, race protrusion 2a) of the sewing machine bobbin 3 does not vary, and the supply of the grease G can be stably performed.

[0026] In addition, if the axial vertical cross section shape of the grease supply passage 12 is formed to have a branched shape in which it is branched into a plurality of parts, or a plurality of fine holes are formed as the grease supply passage 12 so that the inner diameter of the fine holes is about 0.1 mm (about 100 μm), the core material 5 disposed in the grease supply passage 12 becomes unnecessary, but it is difficult to form the grease supply passage 12 in such a manner, so the plastic core material 5 as described above is used.

[0027] As described above, in the grease supply structure 100 of the sewing machine bobbin of the present embodiment, the grease G can be suitably supplied to the sliding portion (race groove 1a, race protrusion 2a) of the sewing machine bobbin 3. And if it is a grease supply structure 100 of a sewing machine bobbin that can suitably supply grease G to the sliding parts (race groove 1a, race projection 2a) of the sewing machine bobbin 3, heat generation and seizure of the sewing machine bobbin 3 can be suppressed, and the occurrence of defects in the sewing machine bobbin 3 can be reduced.

[0028] Note that the present invention is not limited to the above-described embodiment. For example, as shown in FIGS. 4(a) and 4(b), the core material 5 disposed in the grease supply passage 12 may be provided with a plurality (16 in this embodiment) of through holes 5a, and the core material 5 may be such that the axial vertical cross-sectional shape of each through hole 5 is substantially circular. If the axial vertical cross-sectional shape of each through hole a provided in plurality in the core material 5 is substantially circular and the inner diameter of the through hole 5a is about 0.1 mm (about 100 μm), the thickener component of the grease G will not be clogged, and the grease G will pass through little by little. Even with such a grease supply structure 100 of a sewing machine bobbin having the core material 5, grease G can be suitably supplied to the sliding parts (race groove 1a, race projection 2a) of the sewing machine bobbin 3.

[0029] In the above embodiments, the sewing machine bobbin 3, which is a so-called vertical bobbin, is illustrated, and the grease supply structure 100 for supplying grease G to the sewing machine bobbin 3 is described as an example. However, the present invention is not limited to this, and it may be a grease supply structure for a sewing machine bobbin that supplies grease G to a so-called horizontal bobbin.

[0030] Also, the core material 5 of the grease supply passage 12 is not limited to being made of plastic, and may be made of a material such as iron or glass, as long as a plurality of pores are formed and the inner diameter of the pores is about 0.1 mm (about 100 μm).

[0031] Also, of course, other specific detailed structures and the like can be appropriately changed.

Explanation of Reference Numerals

[0032] 1 Outer bobbin case 1a Race groove (sliding part) 2 Inner pot 2a Race protrusion (sliding part) 3 Sewing machine pot 5 Core material 5a Through hole 11 Grease storage part 11a Refill port 11b Cover screw 12 Grease supply path 100 Grease supply structure of sewing machine pot G Grease

Claims

1. A grease supply structure for a sewing machine pan having an outer pan connected to one end of a pan shaft and rotated in a predetermined direction, and an inner pan rotatably installed inside the outer pan, the structure being for supplying grease to a sliding portion where the outer pan and the inner pan slide relative to each other, wherein the outer pan is provided with a grease storage portion filled with the grease and a grease supply passage for guiding the grease from the grease storage portion to the sliding portion, at least a part of the grease supply passage is provided with a core material along the grease supply passage, and the core material is provided with at least one narrow through-hole along the axial direction of the core material. The grease supply structure for a sewing machine pan is characterized by this.

2. The grease supply structure for a sewing machine pan according to Claim 1, wherein the axial vertical cross-sectional shape of the through-hole presents a branched shape in a mode branched into a plurality.

3. The core material is provided with a plurality of the through-holes, and the grease supply structure for a sewing machine pan according to Claim 1, wherein the axial vertical cross-sectional shape of the through-hole presents a substantially circular shape.

4. The grease storage portion is provided at a position outside the rotation center of the pan shaft in the outer pan, and the grease supply structure for a sewing machine pan according to any one of Claims 1 to 3, wherein the grease is configured to be sent out from the grease storage portion and supplied to the sliding portion by centrifugal force accompanying the rotation of the outer pan.

5. The grease supply structure for a sewing machine pan according to any one of Claims 1 to 3, wherein the core material is a member made of plastic.

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