JPH0641683U - Inner pot of all rotary pots - Google Patents

Abstract

(57) [Summary] [Purpose] Prevents rotation stop of the hook due to intrusion of sewing debris into the hook sliding surface in the full-rotation hook. [Structure] In FIG. 1, a yarn splitting tip 1 of the inner hook rail zone 6
The outer pot 2 is placed at a position where the space between 6 and the rear end 18 is equally divided into 9 to 11.
Cut grooves 19-1 and 19 in the order of the rotation direction (arrow 21) of
, -2, 19-3, 19-, ... are provided, and the space between each of the cut grooves and the adjacent cut grooves becomes deeper according to the rotation direction of the outer pot, and the width T≈D / 3 to D / 2. Contact via contact groove 20. [Effects] (1) The rotation of the hook is never stopped due to the rubbing of the sliding surface due to the entry of sewing dust into the sliding surface. (2) Since there are more pockets (cut grooves) to hold the lubricating oil, seizure due to insufficient lubrication has disappeared. (3) Despite long-term operation, the yarn was caught, and the rotation of the hook due to yarn breakage did not stop.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an inner hook of a hook device of a full-rotary sewing machine, and more particularly to a railroad band of the inner hook forming a sliding surface with an outer hook.

[0002]

[Prior art]

 Generally, the full rotary hook is constructed as shown in FIG. 3, and is provided with a cup-shaped outer hook 2 connected to a drive shaft 1 by a tightening screw (not shown). Is rotatably fitted. In order to rotatably fit the inner hook 3 to the outer hook 2, a gauge groove 5 is formed in the inner circumference 4 of the outer hook 2 and a rail 6 is formed in the outer circumference of the inner hook 3. In order to fit the gauge band 6 of the inner hook into the gauge groove 5 of the outer hook, a part of the rail groove 5 is formed in a U shape on the inner circumference of the outer hook, and a part of the groove groove 5 is formed as shown in FIG. The structure is such that a U-shaped gage groove is formed by the flange surface 8 of the retainer 7. With this structure, after fitting the inner hook rail to the outer hook groove, the inner hook holder 7 can be screwed to the outer circumference of the outer hook by a small screw (not shown) as shown in FIG. The hook 2 and the inner hook 3 are configured to be rotatable and inseparable from each other.

The inner hook 3 is formed with the rail track 6 on the outer circumference thereof, and a bobbin case 9 accommodating a bobbin (not shown) wound with a bobbin thread stands inside the inner hook 3 at the center of the inner hook. A latch device 12 is locked in a groove 11 provided at the tip of the provided mandrel 10 and is housed so as not to be separated from the inner pot. Further, a hook stopper piece locking groove 13 is provided on the flange portion of the opening portion of the inner hook, and a hook stopper piece (not shown) provided on the lower portion of the main body of the sewing machine is engaged with the hook stopper piece locking groove 13. When the drive shaft 1 is rotationally driven due to the contact, the inner hook does not rotate, and the rail 6 of the inner hook 3 and the rail groove 5 of the outer hook 2 serve as sliding surfaces to rotate only the outer hook 2. Will be.

As described above, the rail 6 of the inner hook forms a sliding surface with the rail groove 5 of the outer hook 2 so as to rotate the outer hook 2 smoothly. The purpose is to allow the upper thread loop (not shown) caught by the formed sword tip (not shown) to pass over between the head portion 14 of the bobbin case 9 and the bottom portion 15 of the inner hook 3. Therefore, the track 6 is formed not within the entire outer circumference of the inner hook but within a range of about 300 degrees, and the thread splitting tip 16 for distributing the upper thread caught by the sword tip is formed at the tip. .

In the full-rotary hook having the above-described structure, the upper thread captured by the tip of the outer hook during sewing is the characteristic of the upper thread, that is, the difference in the coefficient of friction of the upper thread and the variability of stretchability. When the thread splitting tip 16 cannot catch the upper thread due to the misalignment of the thread as described above, the upper thread enters the sliding surface, that is, between the track 6 and the track groove 5, and the so-called thread is called. Sewing is impossible due to the occurrence of biting and the rotation of the outer hook or the destruction of the inner hook. In order to prevent this, the rail 6 is provided with 2 to 5 cut grooves 17 from a position separated from the yarn splitting tip 16 of the tip portion by about 30 degrees, and the needle thread enters the sliding surface as described above. In this case, the upper thread is cut in the cut groove to prevent the outer hook from becoming unrotatable.

[0006]

[Problems to be solved by the device]

 In addition to the generation of thread fragments cut in the cut groove, diversification of sewing materials, especially recently, there are cases in which various synthetic resin materials such as thread cloth are coated, for example, automobile air bags. Uses yarn and cloth coated to keep airtightness. These coating agents are melted by the heat generated by the needle and the kettle and adhere to the area around the kettle and the bobbin case. In addition, since it is a synthetic fiber, static electricity is generated and dust is accumulated around the thread sliding portion. Lubricant oil in the hook is added to these dusts to become sticky dust, and the thread breaks are added to form so-called sewing dust, which enters the sliding portion of the hook device. The invading sewing dust first enters from the thread dividing tip 16 and is gradually fed in the direction of the cut groove and enters the cut groove to be released from the sliding surface, but with the passage of time, it enters the first cut groove 17-1. Sewing dust gradually accumulates and becomes full, but the sliding surface has a high fitting accuracy and the gap is small, so it is difficult for it to overflow from the cut groove 17-1 and is in a compressed state. Sewing dust will overflow from the cut groove and enter the sliding surface. For this reason, the hook becomes unrotatable here, or the compressed sewing dust escapes to the next cut groove 17-2. In this way, it becomes impossible to rotate during operation, or sewing dust is compressed and accumulated in all cut grooves. As a result of this, at the end, rotation becomes impossible and sewing becomes impossible, and the hook is removed and disassembled and cleaned, resulting in time loss. The present invention solves the above-mentioned drawbacks.

[0007]

[Means for Solving the Problems]

 In FIG. 1, cut grooves 19-1 and 19-2 are arranged in the rotation direction (arrow 21) of the outer hook 2 in the order of 9 to 11 equally dividing the space between the yarn splitting tip 16 and the rear end 18 of the inner hook rail zone 6. , 19-3, 19-, ... are provided, and the cut grooves that are adjacent to each other are deepened in accordance with the rotation direction of the outer pot, and are connected by the connection groove 20 having a width T≈D / 2. It

[0008]

[Action]

 Since the number of cut grooves is large, the storage capacity for sewing dust is large, and the number of times that rotation is impossible due to meshing of sewing dust with the sliding surface is reduced. In addition, since the cut grooves are connected by the connecting grooves that become deeper according to the rotation direction of the outer hook, when the sewing dust moves to the adjacent cut groove, it easily moves without being caught by the sliding surface. Stopping the rotation of the hook due to the meshing of the moving surface and sewing dust is eliminated.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 (A) is a cross-sectional view taken along the center of the width of the rail 6 of the inner hook, and FIG. In the example, the gauge strip 6 was divided into 10 equal parts, and 1 mm cut grooves were provided at each equal position. Naturally, the number of cut grooves was nine. In addition, the width T of the connecting groove 20 is 1/2 of the width D of the railroad track D = 1.6 mm, that is, T = 0.8 mm, and the depth is all cut in the figure. A = 0.3 mm and B = in all grooves. It was 1.0 mm. As for the processing method, not only the sliding surface but also the polishing was used to finish it to a certain degree, but the cut groove and connecting groove worked well by milling.

[0010]

[Effect of device]

 The following effects can be realized by implementing the present invention. (1) The rotation of the hook was never stopped due to the rubbing of the sliding surface due to the entry of sewing dust into the sliding surface. (2) Since there are more pockets (cut grooves) to hold the lubricating oil, seizure due to insufficient lubrication has disappeared. (3) Despite long-term operation, the hook stopped rotating due to thread catching and thread breakage.

[Brief description of drawings]

FIG. 1 is a drawing of an inner pot according to the present invention, in which (A) is a sectional view at the center of the width of the track. (B) is a partial development view of only the gauge zone.

FIG. 2 is a perspective view of a conventional inner pot.

FIG. 3 is a sectional view of a shuttle device incorporating a bobbin case.

[Explanation of symbols]

 1 Drive shaft 2 Outer hook 3 Inner hook 5 Outer hook gauge groove 6 Inner hook rail 7 Inner hook holder 9 Bobbin case 12 Latch device 13 Lock hook locking groove 16 Threading tip of gauge 17 Conventional type Cut groove 18 Rear end of track 19 Cut groove according to the present invention 20 Connecting groove 21 Rotating direction of outer pot D Width of track G S Width of cut groove according to the present invention T Width of contact groove A Initial depth of contact groove B Contact Groove end depth

Claims (1)

[Scope of utility model registration request] 1. An inner hook having a track (6) that fits into a groove groove of an outer hook of a full-rotation sewing machine, wherein a thread splitting front end (16) to a rear end (18) of the inner hook rail (6). The cut grooves (19-1) and (19-
2), (19-3), ... Provided, the distance between each cut groove and the adjacent cut grooves becomes deeper according to the rotation direction (21) of the outer hook, and the width (D) of the track (6). ), A connecting groove (20) having a width (T) of about 1/3 to 1/2 is provided in a substantially central portion of the width of the railroad track to connect with each other.