JP2002200385A - Sewing machine with dust collector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize a dust accumulation quantity in a tubular sewing machine bed section by invariably efficiently sucking and removing the dust most generated below a throat plate without deteriorating the work environment. SOLUTION: A suction pipe 40, which has a tip suction port 42 capable of sucking the air stream including the dust generated below the throat plate 11 and intermediate suction port 43 capable of sucking the air stream including the dust generated near a looper thread handling area, is inserted into the tubular sewing machine bed section 9 fitted with the throat plate 11 at the upper face section and storing sewing components inside. A forced air guide section 32, which can guide air under the suction pipe 40 in the tubular sewing machine bed section 9 and forcibly move the guided air toward the suction ports 42 and 43 of the suction pipe 40, is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine with a dust suction device, and more particularly, a needle plate is mounted on an upper surface portion of a cylindrical sewing machine bed portion protruding from a sewing machine bed base, and a looper or the like is provided inside. Due to the accumulation of dust such as lint and lint generated at the time of sewing such as flat stitching by a sewing machine in which parts for configuring sewing such as a cloth feed mechanism and a knife mechanism are stored in a tubular sewing machine bed. The present invention relates to a sewing machine with a dust suction device that prevents the occurrence of defective sewing, breakage of components, and the like, and further prevents the work environment from being deteriorated due to dust scattered around sewing locations during sewing.

[0002]

2. Description of the Related Art When sewing with a sewing machine, dust such as lint and cloth waste is generated most in the vicinity of a feed base of a cloth feed mechanism provided at a lower position of a needle plate. When scattered and accumulated inside the cylindrical sewing machine bed that contains the parts for sewing, such as the mechanism and the knife mechanism, the loop of the needle thread and looper thread is not formed as specified and sewing such as skipping Not only is a defect prone to occur, but also the accumulated dust interferes with movable parts such as a needle and a looper, and causes a failure such as deformation or damage of the movable parts. Conventionally, as a means for preventing the occurrence of such a sewing failure or a defective situation, dust accumulated by suspending the operation of the sewing machine during sewing and manually blowing air to the tubular sewing machine bed using an air gun is conventionally used. Cleaning means such as scattering and removing were adopted, but in this case, not only the troublesome and time-consuming cleaning work such as blowing air by holding an air gun in hand, but also sewing work was frequently interrupted. This tends to cause a decrease in sewing efficiency. Further, there is a problem that dust scattered due to the blowing of the air stands around the cylindrical sewing machine bed portion and deteriorates the working environment.

As an alternative to such a conventional manual cleaning operation, a suction device such as a vacuum pump or a suction blower is provided in a tubular sewing machine bed as disclosed in, for example, Japanese Utility Model Laid-Open Publication No. 6-72579. By opening and connecting one end of a suction port of a duct or a pipe connected to the sewing machine, forcibly sucking dust generated in the tubular sewing machine bed during sewing and removing the dust from the inside of the tubular sewing machine bed. And, for example, US Pat.
As disclosed in the specification of Japanese Patent No. 4,338, the sewing machine bed is configured such that air generated by a fan provided rotatably with a sewing machine pulley is forced to flow through a radiator of an oil cooler for cooling a lubricating oil, and then a sewing machine bed is formed. 2. Description of the Related Art There has been conventionally proposed a configuration in which the interior of a sewing machine bed is maintained at a positive pressure by blowing into the interior of the sewing machine to prevent dust such as lint from entering the sewing machine bed.

[0005]

As described above, dust generated in the cylindrical sewing machine bed portion is forcibly sucked and removed, or air is blown into the sewing machine bed portion to prevent dust from entering the inside. According to the conventional sewing machine equipped with an automatic cleaning device (self-cleaning device) configured as described above, it is not necessary to perform troublesome and troublesome manual operations such as interrupting the operation of the sewing machine during the sewing and blowing air. There is an advantage that it is not necessary to interrupt the operation of the sewing machine every time, and a decrease in the sewing efficiency can be suppressed.

However, among the conventional sewing machines with a self-cleaning device, in the case of the former self-cleaning type self-cleaning device, one end of a suction port of a duct or a pipe connected to the suction device is also provided inside the tubular sewing machine bed. There is a difference in suction power between the place near the open end and the place far away,
Due to the relationship between the difference in the suction force and the distance to the opening end, it is inevitable that the so-called drift phenomenon, in which the suction air flow in the sewing machine bed flows along a specific path, occurs. For this reason, even if dust generated in the drift region of the suction air can be sufficiently removed by suction, dust generated in a portion outside the drift region is not removed by suction, and is left in the sewing machine bed portion to leave the sewing machine. It will be accumulated in the corners and the like in the bed. In addition, the drift region also fluctuates depending on changes in the amount and form of accumulation of dust in the sewing machine bed portion. As a result, initially, the strongest suction force acts near the position immediately below the needle plate where dust is most generated. Even if you set
The position where the strongest suction force is applied changes due to the fluctuation of the drift region, and it is not possible to sufficiently exert the dust suction performance near the feed base of the cloth feed mechanism under the needle plate where the most dust is generated. there were.

On the other hand, in the case of the latter air-blowing type self-cleaning device as well, a drift phenomenon occurs in the air flow blown into the sewing machine bed due to the position of the opening end of the air blowing port and the position and size of the gap between the sewing machine bed. It occurs, and it is difficult to maintain the whole area in the sewing machine bed at a uniform positive pressure. Therefore, it is inevitable that a part of the dust enters and accumulates in the sewing machine bed. In addition, since an air flow containing dust is always blown out from the inside of the sewing machine bed portion to the outside, there is a problem that a sewing manufacturer is forced to perform work in a very unsanitary working environment.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and always efficiently sucks and removes the most dust generated at the lower portion of the needle plate without deteriorating the working environment. It is an object of the present invention to provide a sewing machine with a dust suction device that can minimize the amount of accumulated dust.

[0009]

According to a first aspect of the present invention, there is provided a sewing machine with a dust-absorbing device, wherein a needle plate is mounted on an upper surface and a part constituting a sewing machine is accommodated therein. An intake pipe having a suction port at a distal end portion capable of sucking an airflow containing dust generated at a lower portion of the needle plate is inserted into a cylindrical sewing machine bed portion projected from the sewing machine bed base portion, Forced air introduction means is provided which is capable of introducing air into the cylindrical sewing machine bed portion below the suction end of the suction pipe and forcibly flowing the introduced air toward the suction end of the suction pipe. It is characterized by having.

According to the first aspect of the present invention, the suction port at the end of the suction pipe inserted into the tubular sewing machine bed is arranged below the needle plate, so that the most suction port can be obtained during sewing. The strongest suction force will be applied to the vicinity of the feed base of the cloth feed mechanism that generates the dust, and most of the dust generated in the tubular sewing machine bed portion is sucked into the suction pipe together with the suction airflow and removed. . At the same time, the air introduced into the sewing machine bed portion from the position below the cylindrical sewing machine bed portion is forcibly flowed upward toward the tip suction port having a strong suction force, so that the cylindrical sewing machine is not directly sucked into the tip suction port. The remaining dust falling and scattered downward in the bed portion is guided to the vicinity of the tip suction port together with the ascending airflow, and then sucked into the suction pipe and removed. In this way, the synergistic effect of the strong suction action near the lower part of the needle plate where the most dust is generated and the circulation action of the forced air flow that is introduced from a lower position and rises and flows in the cylindrical sewing machine bed section is achieved. The self-cleaning function that reliably and efficiently sucks and removes the most dust generated in the sewing machine bed is achieved, and even during continuous sewing for a long time, the accumulated amount of dust is minimized to prevent sewing failures and It is possible to minimize the occurrence of a defect such as deformation or breakage of a movable part such as a looper.

According to the first aspect of the present invention, in the sewing machine with a dust suction device, as described in the second aspect, an opening is provided in the tubular sewing machine bed at a position downstream of the suction port at the tip end of the intake pipe. By forming at least one intermediate suction port capable of sucking in an air flow containing dust generated near the looper thread path, near the looper thread path that generates the next largest amount of dust next to the cloth feed mechanism during sewing. And a strong suction force can be applied to make the air flow containing dust generated due to the friction between the looper thread and the yarn path powerfully and efficiently sucked into the intake pipe, and the accumulation of dust in the tubular sewing machine bed The amount can be further reduced.

[0012] In the sewing machine with a dust suction device according to the first aspect of the present invention, the air flow introduction path for generating a rising forced air flow in the tubular sewing machine bed portion is provided.
The cooling of a part separated from the cooling airflow generated by the cooling fan connected to the main shaft of the sewing machine and fed to the lubricating oil storage unit disposed below the base of the sewing machine. As described above, a part of the cooling air flow generated by the cooling fan originally provided in the sewing machine for cooling the lubricating oil is used as described above. Effective self-cleaning function can be effectively used,
The self-cleaning function can be improved while reducing the cost and size of the entire sewing machine.

Furthermore, in the sewing machine with a dust suction device having the above-mentioned structure, an intake pipe which is bent in a substantially L shape in plan view is used as a suction pipe, and a base end thereof is a cylindrical sewing machine. The suction pipe and the suction pipe are sucked by adopting a configuration in which the bed is inserted into the cylindrical sewing bed so that the bed is located outside the end near the sewing machine bed base side and the tip is located below the needle plate. A connection portion with a pipe connected to a suction device such as a vacuum pump or a suction blower for applying a force can be arranged at a place where it does not interfere with the sewing operation.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a partially cutaway front view of a tubular bed type multi-needle flat stitch sewing machine with a dust suction device according to the present invention, FIG. 2 is an enlarged partially cutaway plan view of a main part of the sewing machine,
FIG. 3 is an enlarged partial cutaway left side view of the main part, FIG. 4 is an enlarged partial cutaway front view of the main part, and FIG. 5 is an enlarged rear view of the main part.

In each of these figures, reference numeral 1 denotes a sewing machine arm. A needle bar 3 is supported at its tip 1A via a bearing 2 so as to be able to reciprocate up and down, and a lower end of the needle bar 3 is provided. , A plurality of needles 5 are attached via needle stoppers 4. An upper drive shaft 7 for reciprocatingly driving the needle bar 3 up and down through a well-known needle bar drive mechanism 6 provided in the distal end portion 1A is provided inside the horizontal portion 1B of the sewing machine arm portion 1. A handwheel 8 is fixed to a protruding right end of the driving upper shaft 7.

Reference numeral 9 denotes a cylindrical sewing machine bed, which is integrally formed with a distal end of a sewing machine bed base 10 extending leftward from a lower portion of the base end 1C of the sewing machine arm 1 in a state parallel to the sewing machine arm 1. The needle plate 11 is fixed to the left side of the cylindrical sewing machine bed portion 9 via a needle plate mounting plate 32, and is internally provided with a looper, a cloth feeding mechanism, and the like. (Parts for detailed description and illustration are omitted because they are well known). The cylindrical sewing machine bed 9, the sewing machine bed base 10, and the sewing machine arm 1 constitute a sewing machine main body 12 of a flat stitch sewing machine.

In the tubular sewing machine bed section 9, a rectangular tubular intake pipe 40 bent in a substantially L-shape in plan view via a mounting plate 41 is provided as shown in FIGS. Its base end 4
0A is protrudingly located at the end of the cylindrical sewing machine bed portion 9 near the machine bed base 10 side, that is, outside the rear surface of the rear end portion,
The remaining tube portion 40B including the distal end portion is inserted and fixed at a position slightly displaced rightward below the needle plate 11 so as not to hinder the operation of the cloth feeding mechanism (not shown).

A needle plate 1 is provided on the upper surface of the distal end of the intake pipe 40.
A suction port 4 capable of sucking an airflow containing dust such as lint and cloth waste generated at a lower part of the first part 1 as shown by a thick arrow a.
2 is formed, and at a position near the upper side surface of the pipe portion 40B downstream of the suction port 42 at the intake side,
An air flow containing dust such as lint generated around a looper thread path (not shown in the drawings), which is opened into the tubular sewing machine bed section 9 and can be sucked in as shown by a thick arrow b. An intermediate suction port 43 is formed. The base end 40A of the intake pipe 40 is connected to a suction device such as a vacuum pump or a suction blower via a pipe or a duct (not shown).

On the other hand, a lubricating oil storage section (generally referred to as an oil pan) configured to cool and maintain the stored lubricating oil by indirect heat exchange with a cooling air flow described later is provided on the lower surface side of the sewing machine bed base 10. The oil pan 13 will be described below. The right end of the machine spindle 14 rotatably supported in the sewing machine bed base 10 via a bearing 15 protrudes rightward, and a driving torque generated by a motor (not shown) is passively applied to the protruding right end. Sewing machine pulley 16 is fixed. The main shaft 14 of the sewing machine and the upper shaft 7 for driving are linked to each other via a timing belt 17.

A cooling fan 18 is fixed to the sewing machine main shaft 14 so as to be rotatable integrally with the sewing machine pulley 16. A fan casing 19 surrounding the fan 18 and opening to the right is provided with a sewing machine bed base. 10 is attached to the rear surface of the base end portion 1C of the sewing machine arm portion 1 on the right side of the sewing machine arm portion 1. An air flow receiving portion formed at the rear portion of the oil pan 13 is formed by a cooling air flow passage 20 formed by the fan casing 19. The cooling air flow generated by the rotation of the fan 18 is sent to the oil pan 13 through the air flow receiving portion 21 to cool the lubricating oil by indirect heat exchange. It is configured to be.

Inside the sewing machine bed base 10, an air passage 28 extending in the front-rear direction is formed at one end side in the lateral width direction, and a part of the rear end side of the internal air passage 28 is formed inward. And a portion of the air separated from the cooling airflow generated by the cooling fan 18 is partially connected to the internal airflow passage 2.
8 so as to flow in the direction of arrow c in FIG.

A bent short pipe 30 is opened and connected to the front end of the internal air flow path 28 via a sealing flange 29, and the front end of the bent short pipe 30 is connected to the front end through an airtight flange 31. Sewing bed base 10
Is opened and connected to a side portion near the front end of the sewing machine bed, and is generated and separated by the cooling fan 18 by the internal air flow path 28 formed inside the sewing machine bed base 10 and the bent short pipe 30. A part of the cooling air flow is introduced through the sewing machine bed base 10 into the cylindrical sewing machine bed portion 9 below the tip suction port 42 and the intermediate suction port 43 in the suction pipe 40, and the introduced air is introduced. As shown by a thick arrow d, a forced air flow introduction passage 32 is formed, which can be forcibly flown toward the distal end suction port 42 and the intermediate suction port 43 of the intake pipe 40.

In the tubular bed type multi-needle flat stitch sewing machine with a dust suction device configured as described above, the driving rotational force of a motor (not shown) is transmitted to the sewing machine main shaft 14 via the sewing machine pulley 16 and the driving force is transmitted to the sewing machine main shaft 14. The rotational force of the sewing machine main shaft 14 is transmitted to the driving upper shaft 7 via the timing belt 17, whereby the needle bar 3 is reciprocated up and down via the needle bar driving mechanism 6, and the needle 5 is moved up and down. At the same time, the components for forming the sewing such as the looper and the cloth feed mechanism housed in the sewing machine bed section 9 operate, and the predetermined sewing is performed.

At the time of sewing, a suction device such as a vacuum pump or a suction blower (not shown) is operated to operate the suction pipe 4.
By generating an intake air flow in the front suction port 4,
The air flow as shown by bold arrows a and b is strongly sucked into the intake pipe 40 into each of the second and intermediate suction ports 43, and the cylindrical sewing machine is operated with the operation of the cloth feed mechanism immediately below the needle plate 11. Most of the dust such as a large amount of lint and cloth waste generated near the feeder in the bed portion 9 and the lint and the like generated near the looper yarn path are sucked together with the suction airflow at the tip suction port 42 and the intermediate suction. It is sucked into the intake pipe 40 from the port 43 and removed.

At the same time, the main flow of the cooling air flow generated in the cooling air flow passage 20 by the cooling fan 18 which rotates together with the sewing machine pulley 16 with the driving rotation of the sewing machine main shaft 14 is transmitted through the air flow receiving portion 21. After the above oil pan 1
3 and cools the lubricating oil by indirect heat exchange with the lubricating oil. On the other hand, a part of the cooling air flow generated and separated in the cooling air flow passage 20 is supplied to the internal air flow of the sewing machine bed base 10. After being introduced from the air flow introduction path 32 formed by the path 28 and the bent short pipe 30 through the sewing machine bed base 10 to the lower part in the cylindrical sewing bed 9, a thick line is formed in the cylindrical sewing bed 9. As shown by the arrow d, the liquid is forcibly flowed toward the tip suction port 42 and the intermediate suction port 43 of the intake pipe 40, and thereby,
The remaining dust, which is not directly sucked into the suction ports 42 and 43 and falls down and scatters in the cylindrical sewing machine bed portion 9, is guided to the vicinity of the suction ports 42 and 43 together with the ascending air flow, and then is introduced into the suction pipe 4.
It is sucked into 0 and removed.

As described above, the powerful suction action near the lower portion of the needle plate 11 that generates the most dust along with the sewing and the vicinity of the looper thread path that generates the next most dust, and the lower position below the strong suction action. And a large amount of dust generated in the tubular sewing machine bed part 9 by the synergistic action with the circulation of the forced air flow which is introduced into the cylindrical sewing machine bed part 9 and flows upward in the sewing machine bed part 9. The self-cleaning function that efficiently removes suction can be used to minimize the accumulation of dust even during continuous sewing over a long period of time, resulting in defective sewing such as occurrence of sewing failure and deformation or breakage of movable parts such as needles and loopers. Generation can be prevented as much as possible.

A flat stitch sewing machine for cooling lubricating oil is originally provided as introduced air for generating a forced ascending airflow in the tubular sewing machine bed section 9 in order to enhance a self-cleaning function by suction of dust. By separating and using a part of the cooling airflow generated by the cooling fan 18, there is no need to additionally install a special device for forced air introduction, and the entire sewing machine can be used. The self-cleaning function can be improved while reducing the cost and size of the device.

Further, an intake pipe 40 bent in a substantially L-shape in plan view is used, and its base end 40a is located outside the end of the cylindrical sewing bed 9 near the sewing machine bed base 10 side, In addition, the remaining tube portion 40B including the tip portion is
By connecting the suction pipe 40 and a pipe connected to a suction device such as a vacuum pump or a suction blower for applying a suction force to the suction pipe 40 by inserting the suction pipe 40 into the cylindrical sewing machine bed portion 9 so as to be located at a lower portion of the suction pipe. The portion does not hinder the sewing operation, and the sewing operation can be easily performed as usual.

The suction device such as a vacuum pump or a suction blower is operated synchronously with the depression of the sewing machine pedal for starting sewing in the operating state of the sewing machine, so that the dust suction operation is started simultaneously with the start of sewing. The operation of the suction device is preferably stopped, but the operation of the suction device is maintained until the operation of the sewing machine is stopped even if the operation of returning the sewing machine pedal from the depressed position to the neutral position is performed. Or the operation of the suction device is maintained for a set time after returning the sewing machine pedal from the depressed position to the neutral position using the delay timer, and further for a set time after the operation of the sewing machine is stopped. Is preferred. As described above, by adopting a configuration in which the operation of the suction device is maintained even after sewing, the time for removing dust by suction can be lengthened and the self-cleaning function can be further enhanced.

[0030]

As described above, according to the first aspect of the present invention, the suction port at the tip end of the intake pipe is disposed below the needle plate that generates the most dust during sewing in the tubular sewing machine bed section,
The air introduced into the cylindrical sewing machine bed from below is forced to flow upward toward the suction port at the tip, so a strong suction action near the lower part of the needle plate and the inside of the cylindrical sewing machine bed By synergistic with the dust circulation through the forcedly flowing air flow, it is possible to exhibit a very excellent self-cleaning function that reliably and efficiently sucks and removes a large amount of dust generated in the cylindrical sewing machine bed. This makes it possible to minimize the accumulation of dust in the tubular sewing machine bed part even during continuous sewing for a long time, and to cause defective sewing such as defective sewing and deformation or breakage of movable parts such as needles and loopers. Is prevented as much as possible.

In particular, by adding the structure of claim 2,
By enhancing the self-cleaning function, the amount of accumulated dust in the tubular sewing machine bed can be further reduced.

Further, in the case of adopting the structure according to the third aspect, in addition to the above effects, the cooling air flow generated by the cooling fan inherently provided in the sewing machine for cooling the lubricating oil is provided. Of the sewing machines can be effectively used for an efficient self-cleaning function, and the self-cleaning function can be improved while reducing the cost and size of the entire sewing machine.

Further, by adopting the structure described in claim 4, the intake pipe is installed so as not to hinder the sewing operation, and the sewing operation can be easily performed as usual.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a cylindrical bed type, multi-needle, flat stitch sewing machine with a dust suction device according to the present invention.

FIG. 2 is an enlarged partially cutaway plan view of a main part of the sewing machine.

FIG. 3 is an enlarged partial cutaway left side view of a main part of the sewing machine.

FIG. 4 is an enlarged partially cutaway front view of a main part of the sewing machine;

FIG. 5 is an enlarged rear view of a main part of the sewing machine.

[Description of Signs] 9 Cylindrical sewing machine bed part 10 Sewing machine bed base part 11 Needle plate 13 Oil pan (lubricating oil storage part) 14 Sewing machine main shaft 18 Cooling fan 32 Forced air flow introduction path 40 Intake pipe 40A Base end of intake pipe 42 Tip suction port 43 Intermediate suction port

Claims (4)

[Claims] 1. Dust generated at a lower portion of a needle plate in a tubular sewing machine bed portion having a needle plate attached to an upper surface thereof, a part constituting a sewing machine stored therein, and protruding from a sewing machine bed base portion. An intake pipe having a suction port at its tip end capable of sucking an airflow containing air is inserted, and air is introduced into a cylindrical sewing machine bed portion below the suction port at the tip of the intake pipe, and the introduced air is introduced. Characterized by being provided with forced air introduction means capable of forcing the air to flow toward the suction port at the tip end of the intake pipe. At least one at least one air outlet opening into the cylindrical sewing machine bed portion and capable of sucking an air flow containing dust generated near the looper thread path is located at a position downstream of the suction port at the tip end of the suction pipe. 2. An intermediate suction port is formed.
A sewing machine with a dust-absorbing device according to item 1. 3. A cooling air flow generated by a cooling fan connected to the main shaft of the sewing machine and separated from a cooling air flow supplied to a lubricating oil storage unit disposed below the sewing machine bed base. The sewing machine with a dust suction device according to claim 1 or 2, wherein the sewing machine is configured to introduce a cooling airflow of the section. 4. The intake pipe is bent in a substantially L-shape in plan view, a base end of the suction pipe is located outside an end of the cylindrical sewing bed near the base of the sewing machine bed, and a tip end thereof is provided. The sewing machine with a dust-absorbing device according to any one of claims 1 to 3, wherein the sewing machine is inserted into the tubular sewing machine bed portion so that the portion is located below the needle plate.