JP4416627B2 - Oil supply limit mechanism for decorative sewing machines - Google Patents

Description

  The present invention relates to an oil supply amount limiting mechanism for a decorative sewing machine that limits the amount of oil supplied to a needle bar in an industrial sewing machine having a needle bar.

The mechanism of the sewing machine has many parts that require lubricating oil, such as parts that operate violently. If the lubricating oil is insufficient, the operation may not be performed smoothly. Therefore, many sewing machines are provided with an oil supply mechanism so that these parts are constantly supplied with oil.
For example, as a mechanism for supplying oil to the needle bar bearing of the sewing machine, an oil sump is provided on the arm base side of the sewing machine, and an oil core is guided from the oil sump along the arm to the vicinity of the needle bar. A mechanism is known in which the needle is slidably contacted directly or via an oiling pad to supply oil to the needle bar sliding portion.
Specifically, the first oil pad is brought into sliding contact with the upper portion of the bearing portion on the upper side of the needle bar, and the first oil core is pressed against the first oil pad. Further, an apparatus is disclosed in which an oil absorbing felt is laid on the bottom surface of the jaw portion of the arm, and the oil absorbing felt is connected to the first oil core via a second oil core (see, for example, Patent Document 1). ). In this apparatus, the lubricating oil is transmitted from the first oil core to the oiling felt, and is supplied to the surface of the needle bar that moves up and down in contact therewith. Then, after being transmitted to the needle bar or scattered, the lubricating oil dropped on the jaw portion of the arm is absorbed by the oil absorbing felt laid on the bottom. Further, the lubricating oil absorbed by the oil absorbing felt is supplied again from the oil supplying felt to the surface of the needle bar through the first oil core due to the capillary action of the second oil core.

On the other hand, a decorative sewing machine equipped with a spreader mechanism that swings the spreader under the tip of the arm section is designed to swing the decorative thread while swinging the decorative thread left and right. Is going. The spreader mechanism has a spreader crank rod for swinging the spreader. In such a sewing machine, the lubricating oil supplied to the needle bar crank rod is scattered and the lubricating oil supplied to the spreader crank rod is also scattered. As a result, the needle bar is supplied with oil. .
JP-A-6-190182

However, in the decorative sewing machine having the above-described spreader mechanism, the lubricating oil supplied by the needle bar crank rod and the spreader crank rod is scattered and adhering indefinitely over the entire needle bar drive mechanism. When the lubricating oil supplied to the lower end portion of the bar, that is, the configuration in the vicinity of the sewing needle leaks, there is a high possibility that the lubricating oil will adhere to the sewn product located therebelow. For this reason, it is preferable to supply lubricating oil to the lower end portion of the needle bar to such an extent that it does not seize due to sliding of the needle bar.
On the other hand, it is necessary to sufficiently supply the lubricating oil to a portion other than the lower end portion of the needle bar, and it is required to limit the amount of lubricated oil supplied to the needle bar.
The present invention has been made in view of the above circumstances, and an object thereof is to provide an oil supply amount limiting mechanism for a decorative sewing machine capable of limiting the oil supply amount to a needle bar.

In order to solve the above-mentioned problem, the invention of claim 1 is, for example, as shown in FIGS. 1 to 6, the spreader mechanism 3 that entangles a plurality of upper threads and the needle bar 22 is driven in the vertical direction. In the oil supply amount limiting mechanism of the decorative sewing machine 100 having the needle bar drive mechanism 2 for
Oil supply means 4 (for example, oil pan 41, pump 42, oil supply pipe 43, vinyl tube 44, oil supply felt 45) for supplying lubricating oil to the spreader mechanism and the needle bar drive mechanism;
An oil sump 5 provided below the spreader mechanism and storing the lubricating oil supplied by the oil supply means;
A wall 7 standing between the spreader mechanism and the lower end of the needle bar drive mechanism;
One end portion of the wall body is immersed in the oil reservoir, and the wall body protrudes toward the needle bar drive mechanism by inserting the wall body. The lower end portion of the needle bar drive mechanism contacts the protruding portion 51a. An oil supply member (for example, an oil core 51) is provided.

According to the first aspect of the present invention, since the wall body is erected between the spreader mechanism and the lower end portion of the needle bar drive mechanism, the lubricating oil supplied from the oil supply means and scattered from the spreader mechanism is caused by the wall body. Blocked. As a result, it is possible to prevent the needle bar drive mechanism from adhering directly to the lower end of the needle bar drive mechanism.
In addition, one end of the oil supply member is immersed in the oil reservoir, and the lower end portion of the needle bar drive mechanism comes into contact with the protruding portion that protrudes toward the needle bar drive mechanism by inserting the wall body. The lubricated oil is appropriately supplied to the lower end of the needle bar drive mechanism. That is, the lower end portion of the needle bar drive mechanism is moderately supplied with lubricant so as not to be seized by frictional heat due to sliding, and the lubricant other than the lower end is scattered from the spreader mechanism by the wall body. Is not shut off, and is sufficiently supplied by the scattered lubricating oil.
Since the amount of oil supplied to the needle bar drive mechanism can be limited in this way, the lubricating oil is not supplied to the entire needle bar drive mechanism in an unlimited manner as in the prior art, and from the lower end of the needle bar drive mechanism. It is possible to reliably prevent dirt from adhering to the sewing product due to leakage of the lubricating oil.
Further, one end portion of the oil supply member is immersed in an oil reservoir, and the lubricating oil scattered from the spreader mechanism and the needle bar drive mechanism can be circulated and used, which is efficient.

The invention of claim 2 is, for example, as shown in FIGS. 1 and 3, in the oil supply amount limiting mechanism of the decorative stitch sewing machine according to claim 1,
The oil reservoir is provided with a recovery means 6 (for example, an oil pan 41, a pump 42, a suction pipe 61, a vinyl tube 62, and a suction felt 63) for recovering the stored lubricating oil to the oil supply means. It is characterized by.

  According to the invention of claim 2, since the lubricating oil stored in the oil sump by the collecting means is recovered to the oil supplying means, it becomes more efficient by circulating and using the lubricating oil.

According to the oil supply amount limiting mechanism of the decorative sewing machine according to the present invention, the lubricating oil scattered from the spreader mechanism is blocked by the wall standing between the spreader mechanism and the lower end of the needle bar drive mechanism, Lubricating oil can be prevented from directly adhering to the lower end of the needle bar drive mechanism.
In addition, one end portion of the oil supply member is immersed in the oil reservoir, and the lower end portion of the needle bar driving mechanism can be brought into contact with the protruding portion protruding from the wall body toward the needle bar driving mechanism side. Lubricating oil can be appropriately supplied to the lower end of the needle bar drive mechanism. Furthermore, the portions other than the lower end can be sufficiently supplied by the scattered lubricating oil without being blocked by the wall. Therefore, by restricting the amount of oil supplied to the needle bar drive mechanism, it is possible to reliably prevent dirt from adhering to the sewing product.
Furthermore, one end of the oil supply member is immersed in the oil reservoir, and the lubricating oil scattered from the spreader mechanism and the needle bar drive mechanism is circulated and used, which is efficient.

Embodiments of the present invention will be described below with reference to the drawings.
1 and 7 are perspective views of an oil supply amount limiting mechanism for a decorative sewing machine according to an embodiment of the present invention. FIG. 2 is a perspective view showing a state in which a protruding portion of an oil core is in contact with a needle bar holder in FIG. 3 is a plan view showing an oil supply amount limiting mechanism, FIG. 4 is a perspective view showing a state where an oil core is inserted through a wall body, and FIG. 5 is a cross-sectional view of the needle bar drive mechanism as viewed from the front. 6 and 6 are cross-sectional views of the spreader mechanism as seen from the front.
As shown in FIGS. 1 and 5 to 7, a decorative sewing machine 100 includes a frame 1 in which each component is accommodated, and a lower shaft that is provided in an arm portion 1 </ b> A of the frame 1 and connected to a motor M. An upper shaft 21c is connected from 21a via a timing belt 21b, and a needle bar drive mechanism 2 that moves a sewing needle (not shown) up and down by the driving force of the upper shaft 21c and a driving force branched from the upper shaft 21c. A spreader mechanism 3 that receives and swings a spreader (not shown) and an oil supply amount limiting mechanism according to the present invention are provided.
Note that the frame 1 has a substantially U-shape when viewed from the front, and externally, a bed portion 1B located at the lower part of the sewing machine 100, a trunk portion 1C standing from the bed portion 1B, The arm portion 1A extends from the upper portion of the body portion 1C along the same direction as the bed portion, and each of the portions 1A to 1C is partitioned by a partition wall.

As shown in FIGS. 1 and 5, the needle bar drive mechanism 2 moves the needle bar 22 up and down, and a needle bar 22 that holds the sewing needle at its lower end (FIG. 1 is omitted for the sake of illustration). An upper metal bearing 23 and a lower metal bearing 24 that can be supported, a counterweight 25 provided in a direction orthogonal to the needle bar 22 and fixed to one end portion of the rotatable upper shaft 21c, and an upper end portion Is provided with a counterweight 25 and a needle bar crank rod 26 whose lower end is rotatably connected to the needle bar 22. That is, a needle bar holder 27 that supports the needle bar 22 is inserted into the needle bar 22, and a part of the needle bar holder 27 is connected to the lower end portion of the needle bar crank rod 26.
With such a configuration, the movement of the lower end of the needle bar crank rod 26 is transmitted to the needle bar 22 by the rotational drive of the upper shaft 21c, and the needle bar 22 moves up and down.

As shown in FIGS. 1 and 6, the spreader mechanism 3 includes a vertical axis 31 that holds the spreader at its lower end and a metal that supports the vertical axis 31 (not shown in FIG. 1) so as to be rotatable about the vertical direction. The bearing 32 (in FIG. 1, the metal hole 32a into which the metal bearing 32 is fitted is shown), the spreader drive shaft 33 to which the swing driving force is transmitted from the upper shaft 21c of the needle bar drive mechanism 2, and the spreader drive. A spreader crank rod 34 whose upper end is rotatably connected to the tip of the shaft 33, and an arm member which is swingably connected to the lower end of the spreader crank rod 34 and connected to the upper end of the vertical axis 31. 35.
With such a configuration, the spreader crank rod 34 swings around the spreader drive shaft 33 by the swing drive of the spreader drive shaft 33, and this swing drive force is transmitted to the arm member 35 and the vertical axis 31. Thus, the spreader performs a swinging motion.

  The oil supply amount limiting mechanism according to the present invention is provided at an oil supply means 4 for supplying lubricating oil to the needle bar drive mechanism 2 and the spreader mechanism 3, and at the bottom of the arm portion 1A, and is supplied to the needle bar drive mechanism 2 and the spreader mechanism 3. An oil reservoir 5 that stores the lubricant oil that has been dropped and a recovery means 6 that recovers the lubricant stored in the oil reservoir 5 to the oil supply means 4 are provided.

  As shown in FIGS. 1 and 5, the oil supply means 4 includes an oil pan 41 accommodated in the bottom of the bed 1 </ b> B of the frame 1 and stored with lubricating oil, a pump 42 that pumps up the lubricating oil in the oil pan 41, A supply pipe 43 connected from the oil pan 41 to the upper part of the arm part 1A through the body part 1C and supplying lubricating oil by driving the pump 42, a vinyl tube 44 connected to a supply port of the supply pipe 43, and vinyl An oil supply felt 45 provided at the tip of the tube 44 is provided. With such a configuration, the lubricating oil stored in the oil pan 41 passes through the supply pipe 43, the vinyl tube 44, and the oil supply felt 45 from above the arm part 1A to the needle bar drive mechanism 2 in the arm part 1A plane. Or the spreader mechanism 3. The supply port of the supply pipe 43 is disposed between the needle bar drive mechanism 2 and the spreader mechanism 3.

The oil sump 5 is located below the spreader mechanism 3 at the bottom of the arm portion 1A.
The recovery means 6 draws the suction felt 63 immersed in the lubricating oil stored in the oil sump 5 and the lubricating oil absorbed in the suction felt 63 by the pump 42 through the vinyl tube 62 to the oil pan 41. And a suction pipe 61 for returning.

In addition, a wall 7 is provided between the spreader mechanism 3 and the needle bar drive mechanism 2 to prevent the lubricant scattered from the spreader mechanism 3 from adhering to the lower end of the needle bar drive mechanism 2. ing. Specifically, the lower end portion of the wall body 7 is in contact with the lower end of the inner wall of the arm portion 1A, and the upper end has a height to the upper end of the needle bar holder 27 when the needle bar 22 is at the top dead center. Lubricating oil is not applied to the rod holder 27.
As shown in FIG. 3, the wall body 7 is disposed between the spreader mechanism 3 (oil sump 5) and the needle bar drive mechanism 2, and is substantially S-shaped in a plan view that partitions both the mechanisms 2 and 3. And a screwing portion 72 that is provided at one end of the blocking portion 71 and is screwed to the holding member 28 fixed to the arm portion 1A. The holding member 28 is a member having a substantially F shape in plan view.
In such a wall body 7, the screwing portion 72 is fixed to the holding member 28 with the screw N, so that the blocking portion 71 is disposed between the needle bar driving mechanism 2 and the spreader mechanism 3 in the arm portion 1A. Has been.
Further, an oil core (oil supply member) 51 is immersed in the lubricating oil of the oil reservoir 5 at the blocking portion 71 of the wall body 7, and a plurality of oil cores (oil supply members) 51 are provided on the oil reservoir 5 side and the needle bar drive mechanism 2 side. It is provided to be inserted through. That is, a plurality of holes (not shown) are formed in the blocking portion 71, and the oil core 51 is sequentially inserted into these holes, and a plurality of protruding portions 51a are formed on the needle bar drive mechanism 2 side. . The plurality of projecting portions 51a come into contact with the lower end portion of the needle bar drive mechanism 2, that is, when the needle bar holder 27 moves up and down, so that lubricating oil is supplied.

The material of the wall body 7 is preferably made of metal, for example, and the height of the wall body 7 is preferably substantially the same as the height of the needle bar holder 27 when the needle bar drive mechanism 2 moves upward.
The oil core 51 is a string or rope-like member made of a fiber such as cotton, and sucks up lubricating oil by utilizing a capillary phenomenon.

Next, the operation of the oil supply amount limiting mechanism of the decorative stitch machine 100 having the above-described configuration will be described.
The lubricating oil stored in the oil pan 41 is pumped up by the pump 42 and absorbed by the supply felt 45 through the supply pipe 43. The lubricating oil is supplied to the needle bar drive mechanism 2 and the spreader mechanism 3 by the lubricating oil falling from the supply felt 45. At this time, in the spreader mechanism 3, the lubricating oil is scattered by the swinging motion of the spreader crank rod 34, and in the needle bar drive mechanism 2, the lubricating oil is scattered by the vertical movement of the needle bar crank rod 26. However, since the wall body 7 is erected between the spreader mechanism 3 and the needle bar drive mechanism 2, the lubricating oil scattered by the spreader crank rod 34 does not directly adhere to the lower end portion of the needle bar 22. . On the other hand, the lubricating oil is sufficiently supplied to the portions other than the lower end portion of the needle bar 22 by driving the spreader crank rod 34 and the needle bar crank rod 26.
Thus, the lubricating oil supplied to the needle bar drive mechanism 2 and the spreader mechanism 3 falls and is stored in the oil reservoir 5 at the bottom of the arm 1A. Also, since one end of the oil core 51 is immersed in the lubricating oil of the oil reservoir 5 and the lubricating oil is absorbed by the oil core 51, the protrusion protruding through the wall body 7 toward the needle bar drive mechanism 2 side. When the needle bar holder 27 comes into contact with the portion 51a when the needle bar drive mechanism 2 moves up and down, the lubricating oil is appropriately supplied to the lower ends of the needle bars 22 such as the needle bar holder 27 and the like.
On the other hand, the lubricating oil stored in the oil reservoir 5 is absorbed by the suction felt 63, pumped up to the pump 42 via the suction pipe 61, and returned to the oil pan 41. Accordingly, the lubricating oil in the oil pan 41 is constantly circulated by the pump 42, the supply pipe 43, the vinyl tube 44, the supply felt 45, the suction pipe 61, the vinyl tube 62, and the suction felt 63.

As described above, according to the oil supply amount limiting mechanism of the decorative sewing machine 100 according to the embodiment of the present invention, the lubricating oil scattered from the spreader mechanism 3 is blocked by the wall body 7 and directly adheres to the lower end portion of the needle bar drive mechanism 2. Can be prevented.
In addition, one end of the oil core 51 is immersed in the oil reservoir 5, and the lower end of the needle bar drive mechanism 2 comes into contact with the protruding portion 51a that protrudes toward the needle bar drive mechanism 2 by inserting the wall body 7. Therefore, the lubricating oil is appropriately supplied to the lower end portion of the needle bar drive mechanism 2, that is, the needle bar holder 27. Further, the lubricating oil scattered by the wall body 7 is not cut off at locations other than the lower end portion, so that it is sufficiently supplied.
Since the amount of oil supplied to the needle bar drive mechanism 2 can be limited in this way, it is possible to reliably prevent dirt from adhering to the sewing product due to leakage of lubricating oil from the lower end of the needle bar drive mechanism 2. it can.
Further, one end of the oil core 51 is immersed in the oil reservoir 5, and the lubricating oil scattered from the needle bar drive mechanism 2 and the spreader mechanism 3 is circulated and used, which is efficient.
Further, since the oil reservoir 5 is provided with a suction felt 63, a suction pipe 61, and the like for collecting the stored lubricating oil into the oil pan 41, it becomes more efficient by circulating and using the lubricating oil.

In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the summary, it can change suitably.
For example, a plurality of oil cores 51 are inserted into the wall body 7 to form a plurality of protruding portions 51 a that protrude toward the needle bar drive mechanism 2, but at least one location that can contact the needle bar holder 27 is provided. The protruding portion 51a may be provided.
That is, the amount of oil supply can also be controlled by adjusting the number of protruding portions 51a. When the amount of oil supply is increased, a larger number of protruding portions 51a are provided, and when the amount of oil supply is decreased, the protruding portions 51a may be reduced.

  Further, the shape of the wall 7 is not limited to the above-described shape as long as the lubricating oil scattered from the spreader crank rod 34 can be blocked.

FIG. 3 is a perspective view of an oil supply amount limiting mechanism in an arm portion of a decorative sewing machine, for illustrating an embodiment of the present invention. FIG. 2 is a perspective view showing a state in which a protruding portion of an oil core is in contact with a needle bar holder in FIG. 1. It is the top view which showed the oil supply amount limiting mechanism same as the above. It is a perspective view which shows the state by which the oil core was penetrated to the wall body similarly. FIG. 3 is a cross-sectional view of the needle bar drive mechanism as viewed from the front in the decorative sewing machine. FIG. 3 is a cross-sectional view of the spreader mechanism as viewed from the front in the decorative sewing machine. FIG. 3 is a perspective view of an oil supply amount limiting mechanism in the arm portion of the decorative sewing machine.

Explanation of symbols

2 Needle bar drive mechanism 3 Spreader mechanism 4 Oil supply means 5 Oil reservoir 6 Recovery means 7 Wall body 22 Needle bar 44 Vinyl tube 45 Oil supply felt 51 Oil core (oil supply member)
51a Protruding portion 61 Suction tube 62 Vinyl tube 63 Suction felt 100 Decorative sewing machine

Claims (2)

In an oil supply amount limiting mechanism for a decorative sewing machine having a spreader mechanism that entangles a plurality of needle threads across a plurality of upper threads and a needle bar drive mechanism that drives a needle bar in the vertical direction,
Oil supply means for supplying lubricating oil to the spreader mechanism and the needle bar drive mechanism;
An oil sump provided below the spreader mechanism and storing the lubricating oil supplied by the oil supply means;
A wall standing between the spreader mechanism and the lower end of the needle bar drive mechanism;
One end portion of the wall body is immersed in the oil reservoir, and the wall body protrudes toward the needle bar drive mechanism by inserting the wall body, and the lower end portion of the needle bar drive mechanism contacts the protruding portion. An oil supply amount limiting mechanism for a decorative sewing machine, wherein an oil supply member is provided.   The oil supply amount limiting mechanism for a decorative sewing machine according to claim 1, wherein the oil reservoir is provided with a recovery means for recovering the stored lubricating oil to the oil supply means.

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