JPS62201181A - Overlock sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an overlock sewing machine that performs overlock sewing on the edges of cloth.

[Conventional technology]

In the overlock sewing machine described in Utility Model Publication No. 57-1909'4, the needle plate is fixed to the lower sewing machine frame at the proximal end in a cantilever manner, and the open end of the throat plate is connected to the lower sewing machine frame to remove the cloth. The cloth plate cover is made to protrude in the feeding direction, the cloth feeding side of the open end, both right and left sides, and the lower part thereof are open, and a cloth plate cover is removably provided at least on the cloth feeding direction side and the left side of the throat plate.

[Problem that the invention seeks to solve]

The above-mentioned known sewing machine has a fabric plate cover, that is, when the front part of the sewing machine bed is installed, the fabric plate cover is connected to the workpiece fabric support surface of the lower sewing machine frame and the upper surface of the throat plate. Almost the same working plane is formed, the sewing work can be carried out smoothly using this working plane, and when the cloth board cover is moved out of the above-mentioned arrangement position,
The cloth feed direction side and the left side of the throat plate are open, and using this open part, threading can be performed from above the lower sewing machine frame to the looper body of the looper mechanism, but the cloth plate cover Since the front part of the throat plate protrudes even when the needle is moved out of the installation position, and the fixed knife is attached to this throat plate, there is a problem that it gets in the way when inserting the thread into the lower looper. there were.

[Means for solving problems]

In order to solve the above problems, the present invention provides at least a fixed knife which is located in front of the lower looper and which obstructs the threading operation to the lower looper, and a fixed knife which is located in front of the lower looper and which is attached to the bed on which the fixed knife is attached. The front part of the lower looper can be opened by retracting the movable part and the front part of the throat plate to an inactive position.

[Sakuban]

Since this invention has the above-mentioned configuration, when threading the looper, the movable part of the bed frame, which can be opened and closed, is retracted to the inactive position, and the fixed knife, movable knife, and throat plate are moved together. The front part is also retracted from the front part of the lower looper,
The front part of the lower looper is fully opened, and the entire lower looper can be viewed directly.

[Embodiment] In the first embodiment shown in FIGS. 1 to 4, 1 is a bed frame, and 2 is a bed thereon. This bed 2 has an opening 4 having a throat plate 3 that can be opened and closed, and the front part of the bed frame 1 facing this opening 4 is separated from the front part of the bed 2 as a movable part 5, and the throat plate 3 is also separated from the bed frame 1. It is divided into a rear part (a) attached to the main body side and a front part (b) attached to the movable part 5.

The movable part 5 rotates around a shaft 6 shown in FIG.
As shown in FIG. 2, a fixed knife 8 having a blade 12 is screwed to a mounting base 7 on the rear upper side of the movable part 5.

Further, a lifting rod 1 to which a movable knife 11 having a blade 13 is attached is also provided.
As shown in FIG. 3, the shaft 14 of the guide 9 of No. 0 is attached to the attachment part 15 on the rear side of the movable part 5 so as to be able to move forward and backward. 16 is received by a spring receiver 17 fixed to the rear end of the shaft 14, thereby compressing the movable knife 11 to the fixed knife 8.

Reference numeral 18 in FIGS. 2 and 4 is a two-pronged lever that drives the lifting rod 10 in conjunction with the moving part of the sewing machine.As shown in FIG. lower axis 2
It is connected to a link 21 that is eccentrically moved up and down by 0.

Further, the front part of the two-pronged lever 18 is opened up and down so that the roller 22 of the elevating rod 10 on the side of the movable part 5 can be easily fitted therein.

Reference numeral 25 in FIGS. 2 to 4 is a hook provided on the movable part 5, which is fixed to the inner end of a horizontal shaft 27 rotatably attached to the rear side of the movable part 5. A knob 28 is fixed to the outer end as shown in FIG.

The hook 25 engages with a locking piece 29 fixed inside the bed frame 1 as shown in FIG. Also, the hook 25 can be removed from the locking piece 29 using the knob 28.

The lower looper 32 is fixed to the upper end of a swinging lever 34 fixed to a digit shaft 33 on the bed frame 1, and has a thread hole 35 on the left side when viewed from the operator's side as shown in FIG. The thread inserted into the thread hole passes through a thread groove 36 on the front surface of the looper 32 and is inserted into a thread hole 37 at the tip of the looper.

In this embodiment, when the movable part 5 is closed, the hook 25 engages with the locking piece 29 and is fixed as shown in FIG.
Since the roller 22 of the lifting bar 10 engages with the two-pronged lever 18, the two-pronged lever 18 swings up and down as the sewing machine operates, thereby raising and lowering the lifting bar 10 and movable knife 11.

When threading the lower looper 32, remove the hook 25 from the locking piece 29 with the knob 28, and move the movable part 5 to the front of the throat plate 3 (along with bf, to the front inactive position as shown in FIG. 2). When the lower looper 32 is retracted, the front surface of the lower looper 32 is opened, so threading through the lower looper 32 becomes extremely easy.

In the second embodiment shown in FIGS. 5 and 6, the movable knife 11 has the same structure as in the conventional example as shown in FIGS. 7 and 8, and the fixed knife 8
is fixed to a mounting plate 26 attached to the movable part 5.

That is, the movable knife 11 is attached to the sewing machine main body 24 on the bed 2.
The boss 43 at the front end of the vertically swinging arm 42 whose rear end is attached to
The spring 4 in the boss 43 is fixed to the left end of the shaft 44 which is rotatably and slidably attached to the
5 to press the movable knife 11 to the right side of the fixed knife 8 by pushing it to the left.

That is, the shaft 44 is provided with a pin 48, and the boss 43 is provided with a notch 49 into which the pin 48 engages and disengages, and when the pin 48 is engaged with the notch 49 as shown in FIG.
1 faces downward and is pressed onto the fixed knife 8 by the spring 45, and the shaft 44 is pulled to the right by the knob 50 at the right end of the shaft 44.
When the pin 48 is removed from the notch 49 and the movable knife 11 is turned forward, the pin 48 comes into contact with the right side surface of the boss 43 as shown in FIG.

Also, in the case of this second embodiment, the hook 25 and the knob 2
8 is fixed to a horizontal shaft 27 rotatably attached to the rear lower part of the movable part 5, as shown in FIG. 6, and can be freely engaged and detached from a locking piece 29 fixed to the bed frame 1.

In the case of this second embodiment as well, the movable part 5 is closed and the hook 25
is engaged with the locking piece 29 and is fixed, and when the movable knife 11 is facing downward and the pin 48 is in the notch 49 as shown in FIG. 11
The movable knife 11 moves up and down as the sewing machine operates, and the edges of the fabric can be trimmed.

To thread the thread into the lower looper 32, pull the shaft 44 to the right against the spring 45 using the knob 5o above the bed 2, remove the pin 48 from the notch 49, turn the movable knife 11 forward, and remove the pin 48. Turn it backwards as shown in Figure 8.

On the other hand, hold the lower knob 28 and attach the hook 25 to the locking piece 2.
9 and rotate the movable part 5 as shown in Fig. 6 to retract the stationary knife 8 to the inactive position together with the front part (b) of the throat plate 3, the front surface of the lower looper 32 will be opened. , threading becomes extremely easy.

The retraction method of the movable portion 5 may be any other method such as a downward rotation method or a pull-out method other than the sideward rotation method as shown in the illustrated example.

〔effect〕

As described above, this invention is based on the front part of the throat plate which is located in front of the lower looper and obstructs the view when threading the lower looper and becomes an obstacle to the threading operation, and the fixed knife only or the throat plate. Since the front part of the bed frame, the fixed knife, and the movable knife are retracted to the front inactive position along with the movable part of the bed frame, when the movable part of the bed frame is retracted when threading the lower looper, the lower looper The front part of the is completely opened.

Therefore, threading can be done while directly viewing the lower looper, and the operator's fingertips can easily approach the lower looper, making threading work on the overlock sewing machine extremely easy and reducing the time required for sewing preparations. be.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a first embodiment of the present invention, Fig. 2 is a perspective view of the same movable part in an open state, and Fig. 3 is a partially longitudinal rear view showing the rear part of the movable part. 4 is a side view showing the drive mechanism of the movable scalpel, FIG. 5 is a perspective view showing the second embodiment, FIG. 6 is a perspective view of the same movable part as shown in the open state, and FIGS. 7 and 8. 9 is an enlarged plan view of each state of the attachment part of the movable scalpel used in the second embodiment, and FIG. 9 is an enlarged partially cutaway front view of the lower looper. 1... Bed frame, 3... Throat plate, 5... Movable part, 8... Fixed knife, 11... Movable knife, 32...
Lower looper, fa)... Rear part of the throat plate, (b)... Front part of the throat plate.

Claims (1)

[Claims] In an overlock sewing machine that has a lower looper and has a fixed knife and a movable knife arranged in front of the lower looper for trimming the edge of the fabric, there is at least a fixed knife located in front of the lower looper that obstructs threading work to the lower looper. An overlock sewing machine configured such that a knife, a movable part of a bed frame to which the fixed knife is attached, and a front part of a throat plate can be retracted to an inactive position to open the front of the lower looper.