JP2009100901A - Shuttle mechanism for sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shuttle mechanism for sewing machine by which a grease is prevented from sticking to the adjusting screw of a hook shaft gear despite the employment of a grease lubrication for the lower shaft gear and the hook shaft gear. <P>SOLUTION: The hook shaft gear 14 has a hook shaft gear body 14a, an upper boss section 14b and a lower boss section 14c. In this case, the hook shaft gear body 14a is housed in the housing section 12 of a shuttle base 11. The upper boss section 14b extends from the upper end of the hook shaft gear body 14a to the upper end of the shuttle base 11. The lower boss section 14c extends downward from the lower end of the hook shaft gear body 14a, and protrudes by a predetermined length from the lower end of the shuttle base 11. That is, the lower boss section 14c extends from the housing section 12 to the outside of the shuttle base 11. The adjusting screw 17 is arranged on the end section of the lower boss section 14c, and the hook shaft gear 14 is fixed to the hook shaft 13 by the adjusting screw 17. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a shuttle mechanism of a sewing machine, and more particularly to a structure in which a shuttle shaft gear and a lower shaft gear are configured to be grease lubricated.

  On the bed of the sewing machine, a hook made up of an outer hook having a sword that catches the loop of the upper thread formed in the stitch hole of the sewing needle and an inner hook that houses the lower thread bobbin, and the outer hook are rotatably supported. A hook shaft, a hook shaft gear fixed to the hook shaft by an adjusting screw, a lower shaft gear that meshes with the hook shaft gear and transmits rotation, and a housing portion that houses the hook shaft gear and the lower shaft gear. A hook mechanism having a pot base is provided. Then, the rotation of the lower shaft is transmitted from the lower shaft gear to the hook shaft gear, and the outer hook is driven to rotate through the hook shaft.

  In this hook mechanism, it is necessary to lubricate the lower shaft gear, the hook shaft gear, and the sliding portion between the outer hook and the inner hook, and usually oil lubrication with lubricating oil is employed. For example, in the case of a horizontal hook, one lamp core branched from a lamp core extending from an external lubricating oil tank is introduced into the inside of the hook shaft, and lubricating oil is supplied to the sliding portion between the outer hook and the inner hook, Lubricating oil is supplied to the lower shaft gear and the shuttle shaft gear by another lamp core branched from the lamp core.

  Further, in the structure of the shuttle drive unit described in Patent Document 1, a main shaft (corresponding to the lower shaft) is used for oil lubrication of the drive gear (corresponding to the lower shaft gear) and the driven gear (corresponding to the shuttle shaft gear). A housing space for housing the drive gear, driven gear and lubricating oil is formed in the penetrating housing, a seal material is attached to the bearing portion of the housing, and the driving gear and the driven gear are lubricated with the lubricating oil stored in the housing space. To do.

  Here, when the blade tip of the outer hook is worn due to long-term use, the hook will be replaced.In this case, after loosening the adjustment screw that fixes the hook shaft gear, Adjust the encounter phase of the outer hook sword to the sewing needle, and tighten the adjustment screw to fix it.

A two-needle sewing machine for sewing a belt loop of a trouser includes a pair of hook mechanisms having two sewing needles and a hook corresponding to the sewing needle. And when changing the space | interval of two sewing needles according to the change of the size of a workpiece | work, it is also necessary to adjust the space | interval of a pair of shuttle mechanism. For example, when the hook is a horizontal hook, when adjusting the distance between the pair of hook mechanisms, the adjustment screw for fixing the lower shaft gear to the lower shaft is loosened and the adjustment screw for the hook shaft gear is loosened. Next, loosen the bolt that secures the hook base to the bed, adjust the position of the hook base so that the gap between the sewing needle and the sword tip of the outer hook matches the specified distance, and then tighten the bolt to place the pot base in the bed. Secure to the part. Next, after adjusting the position of the lower shaft gear according to the position of the pot base, the adjustment screw is tightened to fix the lower shaft gear to the lower shaft. After that, the encounter phase of the outer hook sword with respect to the sewing needle is adjusted, and the hook shaft gear adjusting screw is tightened and fixed.
JP-A-6-304375

  A structure that branches into two systems from the light core extending from the lubricating oil tank and supplies lubricating oil to both the lower shaft gear and the hook shaft gear, and the sliding portion of the outer hook and the inner hook as in the conventional hook mechanism However, the distribution of the lubricating oil to these two systems may not be stable, and depending on the sewing state, the supply amount of the lubricating oil to the sliding portion of the outer hook and the inner hook may be insufficient, and the hook may be seized. There is.

  Therefore, if the lower shaft gear and the hook shaft gear are lubricated with grease, the supply of lubricating oil to the sliding portions of the outer hook and the inner hook can be stabilized. When adopting such grease lubrication, as in the structure of the shuttle drive part described in Patent Document 1, a storage part for storing the lower shaft gear and the shuttle shaft gear is provided, and the interior of the storage part is filled with grease. Will do. However, in this case, since the adjustment screw of the hook shaft gear is also arranged inside the housing portion, grease is always attached to the adjustment screw, but when replacing the hook due to wear of the sword tip of the outer hook, Alternatively, when changing the interval between the sewing needles in a two-needle sewing machine, grease also adheres to the tool that operates the adjustment screw of the hook shaft gear, resulting in reduced work efficiency and wasteful work such as wiping off the grease. There are problems such as an increase in the amount of grease and waste of grease.

  An object of the present invention is to provide a shuttle mechanism for a sewing machine in which grease lubrication is adopted for a lower shaft gear and a shuttle shaft gear, but grease is not attached to an adjustment screw of the shuttle shaft gear.

  The hook mechanism of the sewing machine according to claim 1 is provided with a hook that is disposed in a bed portion of the sewing machine and catches a thread, a hook shaft that rotatably supports the hook, and a hook shaft gear that is fixed to the hook shaft by an adjusting screw. A hook mechanism of a sewing machine comprising: a lower shaft gear that meshes with the hook shaft gear to transmit rotation; and a hook base having a receiving portion that receives the hook shaft gear and the lower shaft gear. It is characterized in that the adjusting screw is disposed outside the pot base without causing grease applied to the shaft gear and the lower shaft gear to leak outside from the housing portion.

  Since the grease applied to the hook shaft gear and the lower shaft gear is arranged so as to be located outside the hook base without leaking the grease from the housing portion to the outside, the grease is applied to the adjustment screw of the hook shaft gear. Does not adhere. Therefore, grease does not adhere to the tool that operates the adjusting screw when the hook is replaced.

  According to a second aspect of the sewing machine hook mechanism of the present invention, in the first aspect of the invention, the hook shaft gear extends from the inside of the housing portion to the outside of the hook base and the adjustment portion is engaged with the lower shaft gear. And a boss portion into which a screw is screwed, and the adjustment screw is disposed at an end portion of the boss portion protruding to the outside of the pot base.

  According to a third aspect of the invention, the hook mechanism of the sewing machine is characterized in that, in the second aspect of the invention, the boss portion is rotatably supported by a bearing metal fixed to the hook base.

  According to the first aspect of the present invention, since the grease applied to the hook shaft gear and the lower shaft gear is arranged so as to be located outside the pot base without leaking the grease from the housing portion to the outside. , Grease does not adhere to the adjustment screw of the hook shaft gear. Therefore, when the adjustment screw for fixing the hook shaft gear is operated from the outside of the housing part with a tool for exchanging the hook or adjusting the phase of the outer hook sword with respect to the sewing needle, the tool does not adhere to the grease. . Therefore, the work efficiency is increased, no wasteful work such as wiping off the grease occurs, and the grease is not wasted.

  According to the invention of claim 2, in addition to the effect of the invention of claim 1, the shuttle shaft gear includes a gear portion that meshes with the lower shaft gear, and the inside of the housing portion to the outside of the shuttle base. And the adjustment screw is disposed at an end of the boss portion that protrudes to the outside of the pot base. The adjusting screw can be positioned outside the pot base without leaking from the housing portion to the outside.

  According to the invention of claim 3, in addition to the effect of the invention of claim 2, since the boss portion is rotatably supported by the bearing metal fixed to the hook base, the hook shaft gear is smooth. It can be supported on the kettle base so that it can rotate.

  Hereinafter, the best mode for carrying out the present invention will be described in detail based on examples and drawings.

  FIG. 1 is a perspective view of a two-needle sewing machine M used for sewing a belt loop. As shown in FIG. 1, the two-needle sewing machine M includes a bed 1 and a pedestal 2 that rises from the bed 1. And an arm portion 3 extending horizontally from the pedestal portion 2 to the left.

  The head 3a of the arm 3 is provided with a needle bar 4 that is driven up and down via a needle bar crank mechanism (not shown) by a driving force of a sewing machine spindle (not shown), and a balance crank (not shown) with the main shaft. A balance 5 that is swingably driven in the vertical direction is provided. Two sewing needles 6 are attached to a needle bar holder 4 a fixed to the lower end of the needle bar 4. A pair of hook mechanisms 10 corresponding to the two sewing needles 6 and a cloth feed mechanism (not shown) are provided inside the bed portion 1, and the pair of hook mechanisms 10 are interlocked and connected to the main shaft. The cloth feed mechanism is also driven by the lower shaft 7.

Next, the pair of shuttle mechanisms 10 will be described. However, since the pair of hook mechanisms 10 have basically the same structure, only one of them will be described.
As shown in FIGS. 2 to 4, the hook mechanism 10 is interlocked with a hook base 11, a receiving portion 12, a hook shaft 13, a hook shaft gear 14, a horizontal hook 15 for catching a thread, and a main shaft. The lower shaft gear 16 is fixed to the lower shaft 7 and the cover member 30 closes the left end surface and the front end surface of the housing portion 12.

  The pot base 11 is a block-like integrated product, and is fixed to a machine frame (not shown) of the bed portion 1 by a plurality of bolts (not shown) so that the position thereof can be adjusted in a direction parallel to the axis of the lower shaft 7. Yes. The accommodating portion 12 includes a front accommodating portion 12a that accommodates the shuttle shaft gear 14, and a rear accommodating portion 12b that is connected to the rear end of the front accommodating portion 12a and accommodates the lower shaft gear 16.

  The hook shaft 13 and the hook shaft gear 14 fitted on the hook shaft 13 are disposed so as to penetrate the front portion of the pot base 11 in the vertical direction, and are rotatably supported by the pot base 11. . An outer hook 15a of the horizontal hook 15 is integrally formed at the upper end of the hook shaft 13, and an inner hook 15b is rotatably accommodated in the outer hook 15a. A lower thread bobbin (not shown) is placed in the inner hook 15b. ) Is installed.

  A sleeve member 18 is fitted and fixed to the vicinity of the upper end of the shuttle shaft 13, and the lower end of the sleeve member 18 is supported by being in contact with a bearing member 19 for thrust. The hook shaft gear 14 extends downward from the lower end of the hook shaft gear body 14a, the upper boss portion 14b extending upward from the upper end of the hook shaft gear body 14a to the upper end of the hook base 11, and the hook shaft gear body 14a. A lower boss portion 14c protruding a predetermined length from the lower end of the pot base 11; That is, the lower boss portion 14 c extends from the accommodating portion 12 to the outside of the pot base 11. In addition, a through hole 13a into which a wick (not shown) extending from a lubricating oil tank (not shown) is introduced is formed in the center of the hook shaft 13 so as to penetrate vertically, and an outer hook 15a and an inner hook 15b are formed from this wick. Lubricating oil is supplied to the sliding part.

  The upper boss portion 14 b of the hook shaft gear 14 is rotatably supported by a bearing metal 20 fixed to the pot base 11, and the lower boss portion 14 c is rotatably supported by a bearing metal 21 fixed to the pot base 11. Has been. An adjustment screw 17 is disposed at the end of the lower boss portion 14 c that protrudes outside the hook base 11, and the hook shaft gear 14 is fixed to the hook shaft 13 by the adjustment screw 17.

  As shown in FIG. 2, the cover member 30 is a plate member made of a thin steel plate, and is a member for closing the left end surface and the front end surface of the housing portion 12. The cover member 30 includes a rear plate portion 30a that covers the left end surface of the rear housing portion 12b, a step plate portion 30b formed at the front end of the rear plate portion 30a, and a left plate that blocks the left end surface of the front housing portion 12a. It has the part 30c and the front board part 30d which plugs up the front-end surface of the front part accommodating part 12a. A circular hole 31 that can pass through the boss portion 16b of the lower shaft gear 16 and three holes 32 are formed in the rear plate portion 30a. Two holes 33 are formed in the left plate portion 30c. Two holes 34 are formed in the front plate portion 30d.

  In the cover member 30, the rear plate portion 30a closes the rear housing portion 12b so that the boss portion 16b of the lower shaft gear 16 penetrates the circular hole 31, and the step plate portion 30b, the left plate portion 30c, and the front plate portion 30d. Then, it is fixed to the pot base 11 with screws 35, 37, and 39 through holes 32, 33, and 34 so as to close the front housing portion 12a.

  Further, grease for lubrication is applied to the tooth surface of the gear portion 14a of the hook shaft gear 14 and the tooth surface of the gear portion 16a of the lower shaft gear 16, and this grease is applied by the cover member 30 as described above. There is no leakage from the closed housing part 12 to the outside.

The operation and effect of the sewing machine shuttle mechanism 10 described above will be described.
Since the adjusting screw 17 is arranged so as to be located outside the hook base 11 without leaking the grease applied to the hook shaft gear 14 and the lower shaft gear 16 from the housing portion 12, the adjusting screw 17 of the hook shaft gear 14 is arranged. Grease does not adhere to the surface. Therefore, when replacing the hook 15 or adjusting the phase of the sword tip (not shown) of the outer hook 15a with respect to the sewing needle 6, when operating the adjustment screw 17 for fixing the hook shaft gear 14 from the outside of the housing portion 12 with a tool. , Grease does not adhere to the tool. Therefore, the work efficiency is increased, no wasteful work such as wiping off the grease occurs, and the grease is not wasted.

  The hook shaft gear 14 includes a gear portion 14 a that meshes with the lower shaft gear 16, and a boss portion 14 b that extends from the inside of the housing portion 12 to the outside of the hook base 11 and is screwed with an adjustment screw 17. 17 is arranged at the end of the boss portion 14c protruding to the outside of the pot base 11, so that the adjustment screw 17 can be moved to the outside of the pot base 11 without leaking the grease from the accommodating portion 12 to the outside by a simple configuration. Can be positioned. Moreover, since the boss | hub part 14c is rotatably supported by the bearing metals 20 and 21 fixed to the pot base 11, it can be supported by the pot base 11 so that the hook shaft gear 14 may rotate smoothly.

  Similarly to the above, the lower shaft gear 16 is configured such that the adjustment screw 22 for fixing the boss portion 16b of the lower shaft gear 16 is located outside the cover member 30. Does not adhere. Therefore, when adjusting the position of the shuttle mechanism 10, since the grease does not adhere to the tool that operates the adjusting screw 22, the work efficiency is improved, and unnecessary work such as wiping off the grease does not occur. Grease is not wasted.

Next, a modification in which the above embodiment is partially changed will be described.
(1) The hook shaft gear 14 is configured such that the hook shaft gear main body 14a, the upper boss portion 14b, and the lower boss portion 14c are not integral members but are separate members, and these are non-rotatably coupled. Also good.

(2) Although the above embodiment has been described with the hook mechanism 10 having the horizontal hook 15 as an example, the present invention can be similarly applied to a hook mechanism having a vertical hook. Further, the present invention can be similarly applied to a single needle sewing machine as well as a two needle sewing machine.

(3) In addition, those skilled in the art can implement the present invention with some modifications without departing from the spirit of the present invention, and the present invention includes such modifications.

1 is a perspective view of a two-needle sewing machine according to an embodiment of the present invention. It is a disassembled perspective view of a shuttle mechanism and a cover member. It is a side view of a shuttle mechanism (state before cover member attachment). It is sectional drawing of a shuttle mechanism.

Explanation of symbols

M 2-needle sewing machine 7 Lower shaft 10 Hook mechanism 11 Hook base 12 Housing portion 13 Hook shaft 14 Hook shaft gear 14a Gear portions 14b, 14c Boss portion 15 Hook 16 Lower shaft gear 17 Adjustment screw 20, 21 Bearing metal

Claims (3)

A hook that is disposed in the bed of the sewing machine and catches the thread, a hook shaft that rotatably supports the hook, a hook shaft gear that is fixed to the hook shaft by an adjusting screw, and a hook shaft gear that meshes with the hook shaft gear. In a shuttle mechanism of a sewing machine including a lower shaft gear that transmits rotation, and a shuttle base having a storage portion that stores the shuttle shaft gear and the lower shaft gear,
A hook mechanism of a sewing machine, wherein the adjusting screw is disposed outside the hook base without causing grease applied to the hook shaft gear and the lower shaft gear to leak outside from the housing portion. . The hook shaft gear includes a gear portion that meshes with the lower shaft gear, and a boss portion that extends from the inside of the housing portion to the outside of the hook base and is screwed with the adjustment screw.
The sewing machine hook mechanism according to claim 1, wherein the adjustment screw is disposed at an end of the boss part protruding to the outside of the pot base.   The sewing machine hook mechanism according to claim 2, wherein the boss portion is rotatably supported by a bearing metal fixed to the hook base.