JPS642712Y2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) This invention relates to a lubricant scattering prevention device for a needle feed sewing machine.

(Prior Art) Conventionally, in needle feed sewing machines equipped with a thread take-up mechanism, sufficient lubricating oil is supplied to the thread take-up mechanism in order to cope with higher speeds.

(Problem to be solved by the invention) For this reason, in this conventional needle-feed sewing machine, lubricating oil is scattered from the take-up mechanism to the surrounding area as the take-up mechanism reciprocates during sewing operation, and the lubricating oil is scattered around the take-up mechanism. The lubricating oil may adhere to the needle bar and leak down the arm through the needle bar, or the lubricant may leak from the gap between the opening provided at the bottom of the arm and the needle bar located inside this opening. There was a problem in that the work cloth on the work cloth support surface was stained by leakage directly downward.

Composition of the invention (means for solving the problem) This invention was made by paying attention to the above-mentioned problems, and includes a sewing machine main shaft 3 rotatably supported on a sewing machine frame 1, A swing shaft 5 supported on the sewing machine frame 1 so as to be rotatable back and forth as the sewing machine main shaft 3 rotates;
a needle bar 8 supported by the needle bar 8 and having a needle 9 at its lower end;
According to the reciprocating rotation of the swing shaft 5, the needle bar 8
A needle bar stand 7 is provided on the swing shaft 5 and supports the needle bar 8 in a vertically movable manner so that the needle bar 8 can swing back and forth in addition to the vertical movement. an opening H provided in the sewing machine frame 1 so as to be movable in the vertical direction and the vertical direction;
A needle-feed sewing machine is equipped with a thread take-up mechanism 17 that is reciprocated to pick up sewing thread as the sewing machine rotates, and a lubricating oil supply system 18 that supplies lubricating oil O to the thread take-up mechanism 17. A shielding member 31 for preventing the lubricating oil O scattered from the balance mechanism 17 from adhering to the needle bar 8 is disposed between the balance mechanism 17 and the needle bar 8. An oil reservoir 34 is provided near the opening H to collect the lubricating oil O attached to the shielding member 31.
A protruding piece 33 is provided for dripping.

(Function) Therefore, in the needle feed sewing machine of this invention,
Since the lubricating oil O that scatters from the thread take-up mechanism 17 as the sewing machine is operating is completely shielded by the shielding member 31, this lubricating oil O is prevented from adhering to the needle bar 8, and the shielding member 31 The attached lubricating oil O is collected by the protruding piece 33 and is reliably dripped into the oil sump 34, so that the attached lubricating oil O can move the needle bar 8 back and forth and up and down. Direct leakage from the gap between the provided opening H and the needle bar 8 is also prevented. Therefore, the lubricating oil O leaks below the arm portion 2 along the needle bar 8, or the lubricating oil O adhering to the shielding member 31 passes directly into the arm portion through the gap between the opening H and the needle bar 8. The possibility of soiling the work cloth on the work cloth support surface due to leakage below the work cloth support surface is reliably prevented.

(Example) Hereinafter, an example of this invention will be described in detail with reference to the drawings.

Now, this embodiment is embodied in a two-needle needle feed sewing machine, and the arm portion 2 of the sewing machine frame 1
Inside, a sewing machine main shaft 3 is rotatably supported via a bearing metal 4. A swing shaft 5 is supported within the arm portion 2 of the sewing machine frame 1 so as to be reciprocally rotatable via a bearing metal 6 so as to extend parallel to the sewing machine main shaft 3, and a pair of upper and lower support cylinder portions 7a are provided at the left end of the swing shaft 5. ,7
A needle bar stand 7 having a shape b is fixed. Needle bar stand 7
A needle bar 8 is vertically movably inserted into and supported by both support cylinder parts 7a and 7b, and two needles 9 are attached to the lower ends thereof. Then, due to the reciprocating rotation of the swing shaft 5 in conjunction with the rotation of the sewing machine main shaft 3, a swing motion is applied to the needle 9 at the lower end of the needle bar 8 in the front and back direction via the needle bar stand 7, and a feed dog (not shown) Feed is applied to the work cloth on the work cloth support surface with the needle 9 penetrating through the work cloth.

A balance crank 10 is located at the left end of the sewing machine main shaft 3.
is fixed, and a crank pin 11 is protruded from an eccentric position on the left side surface thereof. the crank pin 1
1, a needle bar linking rod 12 is rotatably supported approximately at the center, and a T is provided at the tip of one of the arms.
A letter-shaped thread take-up slider 13 is rotatably attached to its shaft portion 13a, and the needle bar 8 is attached to the tip of the other arm via a needle bar holder 14. As the thread take-up crank 10 rotates in conjunction with the rotation of the sewing machine main shaft 3, the needle bar 8 and needle 9 are moved up and down via the crank pin 11, needle bar link 12, and needle bar holder 14, and the bed of the sewing machine frame 1 is moved up and down. A lock stitch is formed on the work cloth on the work cloth support surface by cooperation with a thread loop catcher (not shown) provided in the section.

In this way, the needle feed sewing machine of the present invention has the needle bar 8.
Since the needle 9 is moved not only in the vertical direction but also in the front-back direction, the opening H provided at the lower end of the arm portion 2 for inserting the needle bar 8 is similar to that shown in FIGS. As is clear from FIG. 2, a sufficient gap is provided between the needle bar 8 and the opening H.

Above the take-up crank 10, a take-up take-up 15 is rotatably supported in the arm portion 2 of the sewing machine frame 1 at approximately the center by a support shaft 16, and at one end thereof is a cylindrical portion of the take-up slider 13. 13b is provided with a shaft portion 15a that is slidably inserted into the shaft portion 13b,
A threading hole 15b for threading a sewing thread is formed at the other end. The take-up mechanism 17 is constituted by the take-up lever 15, the take-up slider 13, etc., and when the take-up crank 10 rotates with the rotation of the sewing machine main shaft 3, the take-up lever is moved through the needle bar connecting rod 12 and the take-up slider 13. 15 is reciprocated to pick up the sewing thread.

Next, the lubricating oil supply system 18 for supplying lubricating oil O to the thread take-up mechanism 17 will be described. An oil supply hole 19 is formed, and a supply hose 20 is connected from a pump (not shown).
Lubricating oil O is supplied into the oil supply hole 19 through the oil supply hole 19. An oil passage 21 is formed in the arm portion 2 so as to extend perpendicularly to the oil supply hole 19 toward the bearing metal 4 side of the main shaft 3 of the sewing machine. An adjustment body 22 is accommodated in an adjustable manner. A support shaft 16 for the balance 15 communicates with the oil supply hole 19.
A through hole 23 is formed in the center of the hole 23, and a string 24 for impregnating and supplying lubricating oil O is housed inside the hole 23. A plurality of small holes 25 are formed at the left end of the support shaft 16 so as to communicate with the through holes 23 and extend in the radial direction. Lubricating oil O is supplied.

The sewing machine main shaft 3 is connected to the oil passage 21 so as to communicate with the oil passage 21.
A notch 26 is formed in a part of the bearing metal 4 for use, and an oil-impregnated material 2 made of felt or the like is placed inside the notch 26.
7 is accommodated. Further, a spiral groove (not shown) is formed on the inner circumferential surface of the bearing metal 4, and as the sewing machine main shaft 3 rotates, excess lubricating oil O is returned to the base end side of the arm portion 2 through this spiral groove. It's becoming like that. A through hole 28 is formed in the center of the crank pin 11 so as to communicate with the notch 26, and a string 29 for impregnating and supplying lubricating oil O is provided inside the hole 28.
is accommodated. A small hole 30 is formed from the central shaft support of the needle bar connecting rod 12 to one arm portion so as to communicate with the left end of the through hole 28 and extend toward the thread take-up lever 13 side. Between the shaft part of the rod 12 and the crank pin 11, the needle bar connecting rod 12
between the tip shaft support of the balance slider 13 and the shaft portion 13a of the balance slider 13, and between the cylindrical portion 13b of the balance slider 13 and the balance 1.
Lubricating oil O is supplied between the shaft portion 15a of the shaft portion 5 and the shaft portion 15a of the shaft portion 15a.

A plate-shaped shielding member 31 is vertically fixed to the upper part of the arm portion 2 of the sewing machine frame 1 by a pair of screws 32 so as to be located between the thread take-up mechanism 17 and the needle bar 8. The shielding member 31 shields the lubricating oil O that scatters from the thread take-up mechanism 17 as a result of this movement, thereby preventing the lubricating oil O from adhering to the needle bar 8. A projecting piece 33 is provided near one side of the lower part of the shielding member 31, and its lower edge is formed to be inclined toward the rear of the lower part. The oil is collected and dripped into an oil reservoir 34 provided near the opening H of the arm portion 2.

A through hole 36 is formed in the partition wall 35 in the arm portion 2 of the sewing machine frame 1 below the bearing metal 4 for the sewing machine main shaft 3. A recovery hose 37 is inserted through the through hole 36, one end of which is opened to the oil reservoir 34, and the other end is connected to a pump. By the operation of the pump, the lubricating oil O accumulated in the oil reservoir 34 is recovered via the recovery hose 37, and the supply hose 20
The lubricating oil is supplied to the lubricating oil supply system 18 via the lubricating oil supply system 18.

Therefore, in the sewing machine of this embodiment, when the sewing machine main shaft 3 is rotated, the needle bar 8 and the needle 9 are moved up and down via the needle bar connecting rod 12 etc. as the thread take-up crank 10 is rotated. The reciprocating rotation of 5 imparts a swinging motion in the front and back direction to the needle bar 8 and needle 9 via the needle bar stand 7, and the work cloth support surface is A lockstitch seam is formed on the upper workpiece fabric. Also, due to the rotation of the thread take-up crank 10 accompanying the rotation of the sewing machine main shaft 3, the thread take-up lever 1 is moved through the thread take-up slider 13 at the tip of the needle bar link 12.
5 is rotated back and forth to pick up the sewing thread.
When the sewing machine is operated, a pump (not shown) is operated, and lubricating oil O is supplied from the supply hose 20 to each bearing part of the take-up mechanism 17 via the lubricating oil supply system 18, thereby reducing wear of those parts. Prevented.

On the other hand, during operation of this sewing machine, lubricating oil O is scattered around from the thread take-up mechanism 17, but since the lubricating oil O is completely shielded by the shielding member 31, this lubricating oil O is sprayed onto the needle bar 8. This prevents the lubricating oil O from adhering to the shielding member 31, and the lubricating oil O adhering to the shielding member 31 is collected by the protruding piece 33 and dripped into the oil reservoir 34, so that the lubricating oil O adhering to the shielding member 31 is Direct leakage from the gap between the needle bar 8 and the opening H provided to allow the needle bar 8 to move back and forth and up and down is also prevented. Therefore, the lubricating oil O leaks below the arm portion 2 along the needle bar 8, or the lubricating oil O adhering to the shielding member 31 passes directly into the arm portion through the gap between the opening H and the needle bar 8. 2
It is possible to reliably prevent the risk of soiling the work cloth on the work cloth support surface due to leakage downward.

It should be noted that this invention is not limited to the configuration of the above-mentioned embodiment, and it is also possible to embody the invention by changing the configuration of each part arbitrarily without departing from the spirit of this invention.

Effects of the invention As detailed above, according to this invention, the lubricating oil that scatters from the thread take-up mechanism during operation of the sewing machine is completely shielded by the shielding member, so that this lubricating oil is prevented from adhering to the needle bar. At the same time, the lubricating oil adhering to this shielding member is collected by the protrusion and dripped into the oil sump, allowing the adhering lubricating oil to move back and forth and up and down the needle bar. Direct leakage from the gap between the opening provided for this purpose and the needle bar is also prevented. Therefore, the lubricating oil does not leak downward along the needle bar, or the lubricating oil adhering to the shielding member leaks directly below the arm through the gap between the opening and the needle bar. This can reliably prevent the possibility of soiling the work cloth on the work cloth support surface.

[Brief explanation of the drawing]

FIG. 1 is a partial front sectional view of a sewing machine showing an embodiment of this invention, and FIG. 2 is a partial side sectional view of the sewing machine. 1... Sewing machine frame, 3... Sewing machine main shaft, 5...
Swing axis, 7... Needle bar stand, 8... Needle bar, 9... Needle,
10... Balance crank, 15... Balance, 17...
Balance mechanism, 18... Lubricating oil supply system, 31... Shielding member, 33... Protruding piece, 34... Oil reservoir, H... Opening, O... Lubricating oil.

Claims (1)

[Claims for Utility Model Registration] A sewing machine main shaft 3 rotatably supported on a sewing machine frame 1, and a swing shaft supported on the sewing machine frame 1 so as to be rotatable back and forth as the sewing machine main shaft 3 rotates. 5, a needle bar 8 supported by the sewing machine frame 1 and having a needle 9 at its lower end so as to be able to move up and down as the sewing machine main shaft 3 rotates; and reciprocating rotation of the swing shaft 5. Therefore, a needle bar stand 7 is provided on the swing shaft 5 and supports the needle bar 8 in a vertically movable manner so that the needle bar 8 can swing in the front and rear directions in addition to the vertical movement. , an opening H provided in the sewing machine frame 1 to allow the needle bar 8 to move in the front-rear and up-down directions;
a take-up mechanism 17 that is reciprocatably supported by the sewing machine frame 1 and is reciprocated in accordance with the rotation of the sewing machine main shaft 3 to pick up the sewing thread; and a lubricating oil supply that supplies lubricating oil O to the take-up mechanism 17. In the needle feed sewing machine equipped with a needle feed system 18, a shielding member 31 for preventing lubricating oil O scattered from the thread take-up mechanism 17 from adhering to the needle bar 8 during operation of the sewing machine is attached to the thread take-up mechanism. 17 and the needle bar 8, and this shielding member 31
Lubricating oil scattering in a needle feed sewing machine characterized in that a protruding piece 33 is provided for collecting the lubricating oil O adhering to the shielding member 31 and causing it to drip into the oil reservoir 34 provided near the opening H. Prevention device.