JP2007135874A - Hook shaft cooling mechanism of sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a bed part from becoming hot by efficiently cooling heat generated in a hook shaft by a simple structure without adversely affecting stitch formation. <P>SOLUTION: A bottom raising part 10b is formed at a part below the hook shaft 16 for rotationally driving a rotating hook 20 of an oil pan 10 provided on the lower side of the bed part 2, a rectangular opening 10c is formed at the bottom raising part 10b, and a motor-driven fan 31 is provided on the outer surface of the bottom wall 10c of the oil pan 10 so as to close the opening 10c. When the motor-driven fan 31 is driven, air is blown directly to a metal plate 28 disposed on the lower side of the hook shaft 16 by the motor-driven fan 31, and the hook shaft 16 is efficiently cooled as a result. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a hook shaft cooling mechanism for a sewing machine, and more particularly, an electric fan for cooling is provided in an oil pan provided on the lower side of a bed, and the hook shaft is cooled by blowing air from the electric fan. .

  Conventionally, in various types of sewing machines such as a staggered sewing machine, a needle bar vertical drive mechanism is provided at the tip of the arm part, and a rotary hook and a hook shaft that rotationally drives the rotary hook are provided in the bed part. A rotary hook mechanism is provided, and an upper thread extending from the needle hole of the sewing needle attached to the lower end of the needle bar is hooked with the sword tip of the rotary hook to form an upper thread loop, and the upper thread and the lower thread are entangled, A seam is formed.

  By the way, in a sewing machine having a rotary hook mechanism such as a staggered sewing machine, the rotary hook has an inner hook that houses a bobbin case and an outer hook that rotatably supports the inner hook via a race surface. A hook oil supply mechanism for supplying oil to the race surface is provided so as to prevent seizure even when the motor rotates at high speed. In this case, in the hook oil supply mechanism, the lubricating oil supplied from the oil tank provided in the arm portion is supplied to the race surface through the oil passage formed inside the hook shaft and the oil passage formed in the outer hook. The

For example, a rotary hook drive device for a sewing machine described in Patent Document 1 includes a rotary hook, a hook shaft connected to the rotary hook, and a hook shaft connected to the rotary hook in each of three cylindrical bed portions extending forward from the base frame of the sewing machine. A drive motor that rotates the shuttle shaft and a cooling fan are provided on the drive shaft of the drive motor, and the cooling motor cools the drive motor and the shuttle shaft.
JP-A-11-221389 (4th page, FIG. 3)

  In the rotary hook drive device of the sewing machine described in Patent Document 1 described above, the drive motor and the shuttle shaft are cooled by the cooling fan provided on the drive shaft of the drive motor. Since the blower is strong and is a cylindrical bed, the blower from the cooling fan reaches the rotary hook over the drive motor and hook shaft, so that the upper thread and lower thread at the time of stitch formation may be shaken by the air blow. Therefore, there is a problem in that the seam formation is adversely affected, for example, the seam is not formed or so-called stitch skipping occurs.

  The present invention has been made to solve the above-described problems, does not adversely affect the formation of stitches, and cools the heat generated from the hook shaft with an efficient and simple structure. The object is to prevent the bed portion from becoming hot.

  According to a first aspect of the sewing machine shaft cooling mechanism, an oil pan is provided on the lower side of the bed portion, and a sewing machine shaft provided with a rotary hook and a hook shaft for rotationally driving the rotary hook inside the bed portion is provided. In the cooling mechanism, an opening formed in the wall of the oil pan below the hook shaft and an air blowing means mounted on the outer surface of the oil pan so as to close the opening are provided, and the air blowing means faces the bed portion. It is configured to blow air.

  When the air blowing means provided in the opening of the oil pan wall is driven, the air is blown to the bed by the air blowing means, so even if the hook shaft rotates at high speed and heat is generated by sliding with the oil seal etc. The hook shaft is cooled by the air blown by the blowing means, and the heat of the hook shaft is not transmitted to the bed portion or the oil pan.

  Therefore, even if the operator turns his hand from the lower side of the oil pan and touches the bed portion or the oil pan when removing the bobbin case from the rotary hook, it does not feel hot.

  The shuttle shaft cooling mechanism of the sewing machine according to claim 2 is the sewing machine shaft cooling mechanism according to claim 1, wherein the opening is formed in the bottom wall of the oil pan and is directly blown toward the bed by the blowing means.

  A hook shaft cooling mechanism for a sewing machine according to claim 3 is formed integrally with the oil pan in claim 2 so that a partition vertical wall surrounding the outside of the opening portion rises from the bottom wall of the oil pan to the lower portion of the bed portion, The partition vertical wall is configured to have a shielding wall portion positioned at a connection portion between the rotary hook and the hook shaft.

  A shuttle shaft cooling mechanism for a sewing machine according to a fourth aspect is the one according to the second or third aspect, wherein an air vent hole for discharging the air inside the bed portion and the oil pan is formed in the side wall of the oil pan.

  A shuttle shaft cooling mechanism for a sewing machine according to a fifth aspect of the present invention is the sewing machine according to any one of the second to fourth aspects, wherein the opening is formed in a raised bottom portion formed so as to be higher than the bottom wall portion of the oil pan.

  A shuttle shaft cooling mechanism for a sewing machine according to a sixth aspect is the one according to the first or second aspect, wherein the blowing means is constituted by an electric fan.

  According to the first aspect of the present invention, the mechanism for cooling the shuttle shaft of the sewing machine having the oil pan provided on the lower side of the bed portion and provided with a rotary hook and a hook shaft for rotationally driving the rotary hook inside the bed portion. , An opening formed in the wall of the oil pan below the hook shaft and a blowing means mounted on the outer surface of the bottom wall of the oil pan so as to close the opening are provided to blow air toward the bed portion by the blowing means. Even if the hook shaft generates heat due to sliding with an oil seal or the like due to high-speed rotation of the hook shaft, it receives air blown to the bed by the blowing means. Can be cooled.

  Moreover, since the heat of the hook shaft is not transmitted to the bed or oil pan, when the operator removes the bobbin case from the rotary hook by turning his hand from the bottom of the oil pan, Even when the oil pan is touched, it does not feel hot and workability can be improved.

  According to the invention of claim 2, since the opening is formed in the bottom wall of the oil pan and is directly blown toward the bed by the blowing means, even when the hook shaft generates heat, Since the hook shaft receives air efficiently and directly from the bottom wall side of the oil pan, the cooling efficiency of the hook shaft can be further enhanced. Other effects similar to those of the first aspect can be achieved.

  According to the invention of claim 3, the partition vertical wall surrounding the outside of the opening is formed integrally with the oil pan so as to rise from the bottom wall of the oil pan to the lower part of the bed portion, and the partition vertical wall is Since it is configured to have a shielding wall portion located at the connecting portion with the hook shaft, even if the lubricating oil splatters from the rotary hook that rotates at high speed by sewing, the scattered lubricating oil is blocked by the shielding wall portion. Therefore, it is possible to reliably prevent the lubricating oil from entering the blowing means.

  On the contrary, since the air from the air blowing means is blocked by the shielding wall and does not flow into the rotary hook side, the upper thread and lower thread at the time of seam formation are stabilized, and the adverse effect on seam formation is surely avoided. Can do. Other effects similar to those of the second aspect can be achieved.

  According to invention of Claim 4, since the air vent hole which discharges the air inside a bed part and an oil pan was formed in the side wall of the said oil pan, the hot air after cooling with the ventilation by a ventilation means is in an oil pan. The cooling effect can be further enhanced because the air can be quickly discharged from the air vent hole without stagnation. Other effects similar to those of the second or third aspect can be achieved.

  According to the invention of claim 5, since the opening is formed in the bottom raised portion formed so as to be higher than the bottom wall portion of the oil pan, the waste oil used for oil supply to the sliding portion is recovered and oil is recovered. Even when the oil is stored in the bottom wall of the bread, the waste oil does not flow into the air blowing means that is one step higher, and it is possible to take measures against the lubricating oil for the air blowing means. Other effects similar to those of any one of claims 2 to 4 are achieved.

  According to the sixth aspect of the present invention, since the air blowing means is constituted by an electric fan, the air blowing means can be reduced in size and the cooling effect on the hook shaft can be enhanced.

  The hook shaft cooling mechanism of the sewing machine of the present embodiment directly cools the hook shaft for rotating the rotary hook by blowing with an electric fan to suppress heat generation from the hook shaft and prevent the bed portion from becoming hot. It is.

  As shown in FIG. 1, the staggered sewing machine 1 is configured to face a bed portion 2, a pedestal portion 3 erected from the right end portion of the bed portion 2, and the bed portion 2 from the upper end of the pedestal portion 3. The arm portion 4 extends leftward and is supported by the work table 9.

  The arm portion 4 includes a sewing machine main shaft (not shown) that is rotated in the left-right direction by a sewing motor (not shown), and a needle bar vertical drive mechanism that moves the needle bar 6 with the sewing needle 7 attached to the lower end portion thereof. In addition, a rotary balance mechanism (not shown) that rotates the rotary balance 5 while adjusting the vertical movement of the needle bar 6 is provided.

  A needle plate 8 is slidably provided on the left end of the upper surface of the bed portion 2. A rotary hook 20 disposed below the needle plate 8 and a rotary hook 20 are driven to rotate inside the bed portion 2. A rotary hook mechanism 15 including a hook shaft 16 and the like is provided. Furthermore, an oil pan 10 is provided below the bed portion 2 in which the lubricating oil supplied to the plurality of sliding portions is stored as waste oil.

  First, the rotary hook mechanism 15 will be described with reference to FIG.

  On the lower side of the frame F of the bed portion 2, a shuttle shaft 16 disposed in the front-rear direction is rotatably supported via bearings 17 and 18. An outer hook 21 of the rotary hook 20 is fixed to the rear end portion of the hook shaft 16 via a connecting portion. An annular race surface is formed on the outer peripheral side of the outer hook 21, and the inner hook 22 is rotatably supported through the race surface. Here, although the bobbin case holding a bobbin is accommodated in the inner hook 22, illustration is omitted.

  A pulley 23 with gear teeth is fixed to the shuttle shaft 16, and a timing belt 24 is stretched over the pulley 23 and a pulley fixed to the lower shaft. Therefore, when the sewing machine motor is driven, the main shaft and the lower shaft of the sewing machine are rotated, so that the hook shaft 16 is simultaneously rotated via the timing belt 24 and the rotary hook 20 is synchronized with the vertical movement of the needle bar 6. As a result, the stitches are formed on the work cloth.

  Next, the hook oil supply mechanism 26 that supplies lubricating oil to the rotary hook 20 will be briefly described.

  As shown in FIG. 3, an in-shaft oil supply passage 16 a having a circular cross section is formed inside the rear end portion of the shuttle shaft 16. The outer hook 21 is formed with a hook inner passage 21 a communicating with a race surface (not shown). However, metal oil seals 27 are provided at the end of the hook shaft 16 on the rotary hook 20 side and immediately behind the pulley 24, respectively.

  On the other hand, the front end portion of the in-shaft oil supply passage 16a communicates with an external oil passage Fa that is supplied from an oil tank (not shown). Therefore, the lubricating oil from the oil tank is supplied to the in-shaft oil supply passage 16a through the external oil passage Fa, and the lubricating oil supplied to the in-shaft oil supply passage 16a is supplied to the inner passage 21a of the rotary hook 20, and finally The race surface is refueled. However, on the lower side of the hook shaft 16, as shown in FIG. 3, a metal plate 28 is provided for covering the circulation path used for hook oil supply.

  Next, the hook shaft cooling mechanism 30 that cools the hook shaft 10 from below will be described.

  The bottom wall 10a at the left end of the oil pan 10 is formed with a rectangular raised portion 10b that is one step higher, and a rectangular opening 10c is formed in the raised portion 10b. Therefore, the cooling electric fan 31 as the air blowing means is mounted on the outside of the bottom surface of the oil pan 10 with a plurality of screws 32 so as to close the opening 10c from below. The electric fan 31 is provided with a fine mesh net member 33 and a plate member 34 on the lower side.

  3 and 4, the left end portion and the front end portion of the oil pan 10 described above have a partition wall 10d that is substantially L-shaped in plan view and surrounds the outside of the opening 10c. It is formed integrally with the oil pan 10 so as to rise from 10 a to the lower part of the bed portion 2. However, a part of the partition vertical wall 10d facing in the left-right direction on the rear side is located at a connecting portion with the hook shaft 16 of the rotary hook 20 and is formed as a shielding wall part 10e.

  As shown in FIGS. 2 and 4, the left wall 10 f of the oil pan 10 is formed with a plurality of circular air vent holes 10 g for discharging the air inside the bed portion 2 and the oil pan 10.

  Next, the operation and effect of the hook cooling mechanism 30 configured as described above will be described.

  When the sewing work is started, as described above, the hook shaft 16 and the rotary hook 20 are rotated at a high speed, so that the hook shaft 16 generates heat due to the sliding resistance between the pair of oil seals 27. The generated heat is transmitted to the frame F and the metal plate 28 through the bearings 17 and 18.

  However, since the electric fan 31 is driven at the same time as the power is turned on, the electric fan 31 directly blows air toward the bed 2 and is discharged to the outside through the air vent hole 10g of the oil pan 10. The metal plate 28 provided on the lower side is cooled by air blowing, and the heat of the metal plate 28 is efficiently taken away.

  That is, when the heat of the metal plate 28 is efficiently taken, the temperature of the hook shaft 16 that is a heat generation source is remarkably lowered. Therefore, the heat generated in the hook shaft 16 is not transmitted to the frame F of the bed portion 2 or the oil pan 10, and the operator removes the bobbin case from the rotary hook 20 by turning his / her hand from below the oil pan 10. Even when the bed 2 or the oil pan 10 is touched, it does not feel hot.

  As described above, the oil pan 10 is provided on the lower side of the bed portion 2, and the shuttle shaft of the staggered sewing machine 1 including the rotary hook 20 and the hook shaft 16 that rotationally drives the rotary hook 20 inside the bed portion 2. In the mechanism 30 for cooling 16, an opening 10 c formed in the bottom wall 10 a of the oil pan 10 below the hook shaft 16 and an electric fan 31 mounted on the outer surface of the bottom wall of the oil pan 10 so as to close the opening 10 c. Since the fan is directly blown toward the bed portion 2 by the electric fan 31, even when the hook shaft 16 generates heat due to sliding with the oil seal 27 or the like due to the high speed rotation of the hook shaft 16. Since the lower metal plate 28 directly receives the air blown from the electric fan 31, the heat of the metal plate 28 is taken away, and as a result, the hook shaft 16 can be efficiently cooled.

  In addition, since the heat of the hook shaft 16 is not transmitted to the bed 2 or the oil pan 10, the operator turns his hand from the lower side of the oil pan 10 to remove the bobbin case from the rotary hook 20. Even when the bed part 2 or the oil pan 10 is touched at the same time, it does not feel hot and workability can be improved.

  Further, the partition vertical wall 10d surrounding the outside of the opening 10c is formed integrally with the oil pan 10 so as to rise from the bottom wall 10a of the oil pan 10 to the lower part of the bed portion 2, and the partition vertical wall 10d is Since the shielding wall portion 10e is located at the connecting portion with the hook shaft 16, even if the lubricating oil splatters from the rotary hook 20 that rotates at a high speed by sewing, the scattered lubricating oil is prevented by the shielding wall portion 10e. Therefore, it is possible to reliably prevent the lubricating oil from entering the electric fan 31.

  On the contrary, since the air blown from the electric fan 31 is blocked by the shielding wall 10e and does not enter the rotary hook 20, the upper thread and the lower thread at the time of stitch formation are stabilized and the adverse effect on the stitch formation is ensured. It can be avoided. Further, since the air from the electric fan 31 is shielded by the shielding wall portion 10d so as not to go to the right in FIG. 4, the shuttle shaft 16 can be cooled more effectively.

  Further, since the plurality of air vent holes 10g for discharging the air inside the bed portion 2 and the oil pan 10 are formed in the left side wall 10f of the oil pan 10, the hot air after being cooled by the blowing by the electric fan 31 is the oil pan. Since the air can be quickly discharged from the air vent hole 10g without stagnation within the cooling hole 10, the cooling effect can be further enhanced.

  Further, since the opening 10c is formed in the bottom raised portion 10b formed partially higher than the bottom wall 10a of the oil pan 10, the waste oil used for refueling the sliding portion is recovered and the oil pan 10 is recovered. Even when the oil is stored in the bottom wall 10a, the waste oil does not flow into the electric fan 31 that is one step higher, and it is possible to take measures against the lubricating oil for the electric fan 31.

Next, a modified embodiment in which the above embodiment is partially modified will be described.
1] Although the opening 10c is provided in the bottom wall 10a of the oil pan 10 in the above-described embodiment, the electric fan 29 for cooling is provided on the bottom wall 10a formed on the left side wall 10f of the oil pan 10, and the oil pan 10 An air vent hole 10g may be formed in the bottom wall portion 10a. Also in this case, the same effect as the above-described embodiment can be obtained.
2] The air blow from the electric fan 29 may be supplied to the outlet through the air duct, and the air from the outlet may be supplied directly to the shuttle shaft 16. In this case, the shuttle shaft 16 can be cooled more effectively.
3] In the present invention, the electric fan 29 is configured as the blowing means, but it may be configured such that compressed air is introduced from the compressor.
4) Although the case where the present invention is applied to the staggered sewing machine 1 has been described, the present invention can be applied to a hook shaft cooling mechanism of various sewing machines such as a lockstitch sewing machine.
5] The present invention is not limited to the embodiment described above, and those skilled in the art can implement the present invention by adding various modifications without departing from the spirit of the present invention. The present invention includes such modifications.

1 is a perspective view of a staggered sewing machine according to an embodiment of the present invention. It is a left view of the oil pan provided in the staggered sewing machine. It is a principal part longitudinal cross-sectional left view of a bed part and an oil pan. It is a principal part enlarged partial top view of an oil pan.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Staggered sewing machine 2 Bed part 10 Oil pan 10a Bottom wall 10b Bottom raising part 10c Opening part 10d Partition vertical wall 10e Shielding wall part 10g Air vent hole 16 Hook shaft 20 Rotary hook 30 Hook shaft cooling mechanism 31 Electric fan

Claims (6)

An oil pan is provided on the lower side of the bed portion, and a mechanism for cooling the shuttle shaft of the sewing machine provided with a rotary hook and a rotary shaft that rotationally drives the rotary hook inside the bed portion,
An opening formed in the wall of the oil pan below the hook shaft;
Blower means mounted on the outer surface of the oil pan so as to close the opening,
Provided,
A hook shaft cooling mechanism for a sewing machine, wherein the blower unit is configured to blow air toward the bed portion.   2. The sewing machine shaft cooling mechanism according to claim 1, wherein the opening is formed in a bottom wall of the oil pan and is directly blown toward the bed by the blowing unit.   A partition vertical wall surrounding the outside of the opening is formed integrally with the oil pan so as to rise from the bottom wall of the oil pan to the lower part of the bed portion, and the partition vertical wall is connected to the shuttle shaft of the rotary hook. 3. The hook shaft cooling mechanism for a sewing machine according to claim 2, wherein the hook shaft cooling mechanism is configured to have a shielding wall portion positioned at the portion.   4. The sewing machine shaft cooling mechanism according to claim 2, wherein an air vent hole for discharging air inside the bed portion and the oil pan is formed in a side wall of the oil pan. 5.   The sewing machine shuttle shaft cooling mechanism according to any one of claims 2 to 4, wherein the opening is formed in a raised bottom portion formed so as to be higher than a bottom wall portion of the oil pan.   The shuttle shaft cooling mechanism for a sewing machine according to claim 1 or 2, wherein the blower means comprises an electric fan.

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