JP3799458B2 - Industrial sewing machine drive - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive device for an industrial sewing machine, and more specifically, a sewing machine driving motor is arranged above a sewing machine table on which a sewing machine body is installed, and an output shaft of the sewing machine driving motor and a sewing machine main shaft on the sewing machine body side. The present invention relates to a drive device for an industrial sewing machine such as a flat stitch sewing machine that is interlocked and connected via a toothed pulley and a toothed belt.
[0002]
[Prior art]
In this type of industrial sewing machine, the motor for driving the sewing machine is arranged above the sewing machine table, so that the motor is driven with a simplified structure compared to the case where the motor is arranged in a narrow space below the sewing machine table. This system has excellent features such as easy maintenance and maintenance of the system in a large work space and the ability to increase the power transmission efficiency of the belt drive system.
[0003]
On the other hand, in the configuration in which the sewing machine driving motor, the pulley with tooth for rotation transmission, and the toothed belt are arranged above the sewing machine table as described above, dust such as lint that is generated at the time of sewing and scattered around is generated. It is easy to get on and adhere to the pulley peripheral surface and belt, and as the dust is compressed and accumulated on the pulley peripheral surface, it causes abnormal tension on the belt, resulting in unexpected load on the machine spindle and motor. Therefore, there is a problem that abnormal heat generation is caused or the belt is finally broken.
[0004]
Therefore, in order to ensure the safety of the sewing manufacturer against the rotation transmission location by the toothed pulley and the toothed belt, it is conceivable to cover the rotation transmission location with a simple protective cover. For example, as disclosed in Japanese Patent Application Laid-Open No. 8-196769, for example, a cooling fan is fixed to the motor output shaft concentrically with the toothed pulley, and a ventilation hole is provided near the toothed pulley. Covers the entire toothed pulley and toothed belt with a protective cover, and transmits the motor drive rotational force to the machine spindle through the toothed pulley and toothed belt, while passing the protective cover through rotation of the cooling fan. A configuration has been proposed in which outside air is sucked from the pores, and the outside air flows through the protective cover to the motor side to cool the motor.
[0005]
[Problems to be solved by the invention]
However, in the technology of the configuration as described in the above publication, although it is possible to suppress the heat generation of the motor by the external airflow generated on the outer periphery of the motor due to the rotation of the cooling fan during the rotation transmission operation, The above protective cover is only to ensure the safety of the sewing manufacturer, and does not fulfill the function of preventing the entry of dust.Therefore, it is caused by the negative pressure generated during the rotation transmission operation by the toothed pulley and the toothed belt. Most of the lint and other dust scattered around the sewing machine body is sucked into the protective cover, and it falls on and adheres to the pulley peripheral surface and belt, and accumulates on the pulley peripheral surface and accumulates on the belt. As a result, abnormal tension is caused, and although a cooling fan for suppressing heat generation is provided, an unexpectedly large load is applied due to abnormal tension of the belt. Or accelerate the generation of heat, inviting breakage of the belt, there is a problem that interfere with the rotary heat transfer operation from the motor in a short period of time than the trouble caused by the heat generation of the motor occurs to the sewing machine main shaft. Of course, in a configuration in which only the protective cover is provided and the motor output shaft is not equipped with a cooling fan, the motor abnormally heats up earlier due to abnormal tension of the belt due to the intrusion of dust into the protective cover. Therefore, the rotation transmission operation from the sewing machine to the sewing machine spindle will be troubled in a very short time.
[0006]
The present invention has been made in view of the above circumstances, and dust such as lint is scattered around while achieving simplification of the structure, ease of maintenance of the drive system and improvement of power transmission efficiency. Main object of the present invention is to provide a drive device for an industrial sewing machine capable of stably maintaining a rotation transmission operation by a toothed pulley and a toothed belt over a long period of time even under sewing conditions It is said.
[0007]
Another object of the present invention is to improve the lubrication performance by exerting a cooling function for the sewing machine lubricating oil without impairing the above object.
[0008]
[Means for Solving the Problems]
In order to achieve the above main object, the industrial sewing machine driving device according to the invention of claim 1 is supported by a sewing machine driving motor via a bracket at the rear part of the sewing machine body above the mounting surface on the sewing machine table. The output shaft of the motor for driving the sewing machine and the main spindle of the sewing machine which is inserted into the bracket and protrudes from the side of the sewing machine main body are fixed to both shafts, and the teeth suspended between the toothed pulleys. A drive device for an industrial sewing machine that is interlocked and connected by a belt with a belt, and a dust-proof cover that covers the entire pulley with both teeth and the toothed belt is attached to the bracket and penetrated through the bracket. A dustproof airtight seal that closes a gap between the outer peripheral surface of the sewing machine main shaft is provided at an inner peripheral edge of the insertion hole of the sewing machine main shaft.
[0009]
According to the first aspect of the present invention having the above-described configuration, since the sewing machine drive motor, the toothed pulley for rotational transmission, and the toothed belt are arranged above the sewing machine table, maintenance of the drive system is performed. It can be easily managed in a large work space, and the power transmission efficiency of the belt drive system can be increased. Of course, the entire toothed pulley and toothed belt are covered with a dust-proof cover. At the same time, the gap between the inner peripheral edge of the machine spindle insertion hole penetrating the bracket for attaching the dust cover and the outer peripheral surface of the machine spindle is closed with a dust-proof airtight seal to seal the interior of the dust cover. Therefore, it is possible to prevent dust, such as lint that is generated during sewing and scattered around, from entering the cover and adhering to and accumulating on the peripheral surface of the pulley and the belt. By, a long period even in use, the abnormal tension and motor overheating due to its belt, more without rupture of the belt can be kept good always stably a predetermined rotation transmitting action.
[0010]
Further, the invention according to claim 2 is the industrial mining drive device according to the invention according to claim 1, wherein the sewing machine main shaft is located closer to the base end of the sewing machine arm than the dustproof airtight seal. A cooling fan that feeds a cooling air flow to the lubricating oil storage part located below the base of the sewing machine bed is fixed so as to be able to rotate integrally, and the outside air inlet by the cooling fan is attached to the dustproof cover. The bracket is formed on the bracket portion excluding the portion. According to such a configuration, the function of preventing dust and other dust from entering the dust cover is provided in the same manner as in the first aspect of the invention. The outside air taken in by the cooling fan that rotates integrally with the sewing machine main shaft while generating the air flow for cooling the lubricating oil storage part disposed below the base part of the sewing machine bed part, Prevents temperature, it is possible to maintain the lubricating effect by the lubricating oil satisfactorily.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a partially cutaway front view of a flat stitch sewing machine to which an industrial sewing machine drive device according to the present invention is applied, FIG. 2 is a right side view, and FIG. 3 is an enlarged partially cutaway plan view of an essential part. 1 to 3, reference numeral 1 denotes a sewing machine arm portion. A needle bar 3 is supported at a tip end portion 1 </ b> A via a bearing 2 so as to be reciprocally movable in the vertical direction, and a lower end portion of the needle bar 3. Are attached with three needles 5, 5... Inside the horizontal portion 1B of the sewing machine arm portion 1 is an upper shaft 7 for driving for reciprocating the needle bar 3 up and down via a known needle bar drive mechanism 6 provided in the tip 1A. The handwheel 8 is fixed to the projecting end portion of the upper shaft 7 for driving to the right side.
[0012]
Reference numeral 9 denotes a sewing bed portion, which is integrally and continuously connected to a distal end of a base portion 10 extending to the left side in parallel with the sewing machine arm portion 1 from a lower portion of the base end portion 1C of the sewing machine arm portion 1. A needle plate 11 is fixed to the upper surface portion of the sewing machine bed portion 9, and components for configuring stitches such as a looper and a cloth feeding mechanism are included inside (it is well known, and detailed description and illustration are omitted) Is stored. The sewing machine bed 12 and the sewing machine arm 1 constitute a sewing machine body 12 of a flat stitch sewing machine.
[0013]
Reference numeral 13 denotes a lubricating oil storage portion (generally referred to as an oil pan, hereinafter referred to as an oil pan) that is disposed and fixed on the lower surface side of the base portion 10, and indirectly exchanges heat with a cooling airflow described later. Is configured to cool the stored lubricating oil. A sewing machine main shaft 14 is rotatably supported in the base 10 of the sewing machine bed portion 9 via a bearing 15. The sewing machine main shaft 14 and the driving upper shaft 7 are coupled to each other through a timing belt 16. ing.
[0014]
17 is fixed to the right end surface of the base end portion 1C of the sewing machine arm 2 in the sewing machine main body 2 via a bolt 18 above the mounting surface 1D on the sewing machine table (not shown) of the sewing machine main body 12. A sewing machine driving motor 20 is supported by a rear end portion of the bracket 17 via a motor mount 19. As clearly shown in FIG. 4, each of the output shaft 20 a of the sewing machine driving motor 20 and the bracket 17 is inserted into the protruding shaft portion 14 a of the sewing machine main shaft 14 so as to protrude rightward. (Hereinafter referred to as “timing pulley”) 21 and 22, and a toothed belt (hereinafter referred to as “timing belt”) 23 is stretched between these timing pulleys 21 and 22. The sewing machine driving motor 20 and the sewing machine main shaft 14 are interlockedly connected to each other by the control pulley 23 and the timing pulleys 21 and 22.
[0015]
A dustproof cover 24 covers the timing belt 23 and the timing pulleys 21 and 22 as a whole. The entire periphery of the opening edge of the timing belt 23 and the timing pulleys 21 and 22 is in close contact with the outer surface of the bracket 17 and the motor mount 19 via the bolt 25. It is fixed to the bracket 17 and the motor mount 19. As shown most clearly in FIG. 4, the inner peripheral edge of the insertion hole 26 of the sewing machine main shaft 14 extending through the bracket 17 is in close contact with the outer peripheral surface of the sewing machine main shaft 14. A dust-proof airtight seal 27 that closes a gap between the inner peripheral edge of the insertion hole 26 and the outer peripheral surface of the sewing machine main shaft 14 is fitted and held.
[0016]
Further, the bracket 17 is formed with a recessed portion 17a that opens toward the base end 1C side of the sewing machine arm portion 1 in the sewing machine body 2, and the sewing machine arm is located in the recessed portion 17a more than the dustproof airtight seal 27. A cooling fan 28 that can rotate integrally with the sewing machine main shaft 14 is fixed to the sewing machine main shaft 14 at a position near the base end of the portion 1.
An outside air intake port 29 by the cooling fan 28 is formed in a semicircular groove shape in the bracket 17 portion excluding the attachment position of the dustproof cover 24, and the outside air intake port 29 is rotated along with the rotation of the cooling fan 28. The cooling air flow that has been taken in is supplied to the oil pan 13 through a cooling air flow passage 31 formed by the fan casing 30 to cool the lubricating oil by indirect heat exchange.
[0017]
In the flat stitch sewing machine configured as described above, the driving rotational force of the output shaft 20a of the sewing machine driving motor 20 is transmitted to the sewing machine main shaft 14 via the timing pulley 21, the timing belt 23, and the timing pulley 22, and The rotational force of the sewing machine main shaft 14 is transmitted to the driving upper shaft 7 through the timing belt 16, whereby the needle bar 3 is reciprocated up and down through the needle bar driving mechanism 6, and the needle 5 is moved up and down. At the same time as reciprocating in the direction, parts for constituting the sewing such as a looper and a cloth feed mechanism housed in the sewing machine bed portion 9 are operated and predetermined sewing is performed. At the time of sewing, the cooling air flow generated when the outside air is taken in from the outside air inlet 29 by the rotation of the cooling fan 28 that rotates integrally with the timing pulley 22 as the sewing machine main shaft 14 is driven is a fan casing 30. Is supplied to the oil pan 13 through the cooling air flow passage 31 formed by the above, and the lubricating oil and the bearing 15 in the base portion 10 of the sewing machine head portion 9 are cooled by indirect heat exchange.
[0018]
At the time of sewing as described above, the timing pulleys 21 and 22 and the timing belt 23 for interlockingly connecting the motor 20 and the sewing machine main shaft 14 are covered with a dustproof cover 24 and the dustproof cover 24 is attached. A gap between the inner peripheral edge of the insertion hole 26 of the sewing machine main shaft 14 penetrating the bracket 17 and the outer peripheral surface of the sewing machine main shaft 14 is closed by a dustproof airtight seal 27, and the cooling Since the outside air for generating a cooling air flow for cooling the lubricating oil in the oil pan 13 with the rotation of the fan 28 is also taken in from the outside air inlet 29 at a location away from the dust cover 24, the dust cover 24 Therefore, dust such as lint generated at the time of sewing and scattered in the surroundings enters the cover 24. It is not to adhere to the peripheral surface and the timing belt 23 of the timing pulleys 21 and 22 deposited. Thus, even when used for a long period of time, the timing belt 23 does not become abnormally tensioned or broken, and it is possible to always keep a predetermined rotational transmission operation stably. Further, since the inside of the dust-proof cover 24 is almost sealed, the metal-specific noise generated during the rotation transmission by the timing pulleys 21 and 22 and the timing belt 23 is very little leaked to the outside. It is possible to suppress discomfort given to the person.
[0019]
In the above-described embodiment, the description has been given of the one applied to the flat stitch sewing machine. However, the same effect can be obtained even when applied to other sewing machines such as a double chain stitch sewing machine and an overlock sewing machine. .
[0020]
【The invention's effect】
As described above, according to the first aspect of the present invention, the sewing machine driving motor, the toothed pulley for rotation transmission from the motor to the sewing machine main shaft, and the toothed belt are arranged above the mounting surface on the sewing machine table. By adopting the arranged configuration, the drive motor can be easily maintained and managed in a wide work space as well as the structure is simplified compared to the case where the drive motor is arranged below the sewing machine table. In addition to improving the power transmission efficiency of the belt drive system, the whole toothed pulley and toothed belt are covered with a dustproof cover, and the main shaft of the sewing machine penetrating the bracket for attaching this dustproof cover is used. The gap between the inner periphery of the hole and the outer peripheral surface of the sewing machine main shaft is closed with a dust-proof airtight seal, and the interior of the dust-proof cover is kept tight so that sewing is possible. Can dust lint etc. are scattered around occurs above the machine table intrudes into the cover to reliably prevent the deposit adhering to the peripheral surface and belt pulley. Therefore, even when sewing is used for a long time under conditions where dust such as lint is scattered around the belt, abnormal belt tension, abnormal heat generation from the motor, and even belt breakage There is no occurrence of the situation, the predetermined rotation transmission operation can always be kept stable, and in addition, the unpleasant noise peculiar to metal caused by rubbing between the pulley and the belt is prevented from leaking outside the dust cover. There is an effect that the working environment for the sewing manufacturer can be improved.
[0021]
According to the second aspect of the present invention, as in the first aspect of the present invention, the main body rotates integrally with the sewing machine main shaft while ensuring the function of preventing dust and other dust from entering the dust cover. The effect of being able to keep the lubricating action by the lubricating oil good by forcibly cooling the lubricating oil storage part arranged below the base part of the sewing machine bed part by the outside air taken in by the cooling fan to prevent the temperature of the lubricating oil from rising. Also play.
[Brief description of the drawings]
FIG. 1 is a partially cutaway front view of a flat stitch sewing machine to which an industrial sewing machine drive device according to the present invention is applied.
FIG. 2 is a right side view of the above-described sewing machine.
FIG. 3 is an enlarged partially cutaway plan view of the main part of the sewing machine.
FIG. 4 is a right side view of an enlarged part of the main part of the sewing machine.
[Explanation of symbols]
9 Sewing machine bed part 9A Inside of sewing machine bed part 10 Base part 12 Sewing machine body 13 Oil pan (lubricating oil storage part)
14 Sewing machine main shaft 17 Bracket 20 Sewing machine driving motor 20a Output shafts 21, 22 Timing pulley (toothed pulley)
23 Timing belt (toothed belt)
24 Dust-proof cover 26 Sewing machine spindle insertion hole 27 Dust-proof airtight seal 28 Cooling fan 29 Outside air intake

Claims (2)

A sewing machine driving motor is supported via a bracket on the back of the sewing machine body above the mounting surface on the sewing machine table.
The output shaft of this sewing machine driving motor and the main shaft of the sewing machine which protrudes from the side of the sewing machine body through the bracket are fixed to both shafts, and the toothed belt suspended between the toothed pulleys. An industrial sewing machine drive unit linked by
A dustproof cover that covers the entire pulley with both teeth and the toothed belt is attached to the bracket,
An industrial sewing machine drive device characterized in that a dustproof airtight seal is provided at the inner peripheral edge of the insertion hole of the sewing machine main shaft penetrating the bracket to close the gap between the outer peripheral surface of the sewing machine main shaft. . A cooling fan that feeds a cooling air flow to the lubricating oil storage portion disposed below the base of the sewing machine bed is integrated with the sewing machine main shaft closer to the base end of the sewing machine arm than the dustproof airtight seal. 2. The industrial sewing machine drive device according to claim 1, wherein the cooling machine is fixed so as to be rotatable, and an outside air intake port formed by the cooling fan is formed in the bracket portion excluding the attachment portion of the dustproof cover.

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