JPS5833983Y2 - Overlock sewing machine - Google Patents

Description

[Detailed description of the invention] This invention has a looper for chain stitching, a looper for overlocking, and a fabric cutting mechanism, and can perform safety stitching using a double needle and oversewing with a single needle. This overlock sewing machine can also be used as a chain stitch sewing machine by disabling an overlocking looper and a cloth cutting mechanism.

When trying to use a conventional overlock sewing machine that is capable of safety stitching as a chainstitch sewing machine, even if it is possible to chain stitch the edges of the fabric, the following must be done when chain stitching the center of the fabric other than the edges. This caused some inconvenience.

One of these is that the hem looper that moves up and down the throat plate gets in the way, and the other is that the fabric is cut by the movable knife of the fabric cutting mechanism that is used in many overlock sewing machines of this type. That's true.

It is already known to make it possible to select the active or inactive state of a hem looper and to select the active or inactive state of a fabric cutting device.

However, these selection devices are not related to each other and require individual operations to disable them.

In view of the above, this invention is designed to enable the looper for edge stitching and the movable scalpel to be set to the inactive state at the same time with a single operation, and an embodiment thereof will be described below based on the drawings.

First, the overlocking looper actuating device will be explained with reference to FIG.
A lever 2 is fitted on the lower shaft 4 so as to be able to swing freely.
It is connected by a crank 5 and a link 3, which are fixed to each other.

The intermediate portion of a bell crank-shaped clutch body 6 is loosely fitted onto the support shaft 1, and the clutch body is connected by a link 8 to a lever 7 which is also pivotably supported on the frame, and which is connected to the lever 2 by a link 8. They are connected in an intermittent manner by a clutch mechanism, which will be described later.

Therefore, in a state where the lever 2 and the clutch body 6 are connected, when the clutch body 6 swings due to the rotation of the crank 5, the looper 10 for overlocking fixed to the pivot shaft 9 which pivots the lever 7 and the link 8 is moved. It performs reciprocating motion in the vertical direction.

Next, the operating device of the movable scalpel will be explained with reference to FIG.

Reference numeral 13 denotes a female lever which is loosely fitted to the support shaft 14 of the shaft support with the middle portion of the frame as a frame, and its minus side is formed as a two-pronged lever, and the other end is shaped like a bell crank and is swingably attached to the support shaft 14. The female arm 15 is connected in an intermittent manner by a clutch mechanism, which will be described later, and the female arm is further connected at its intermediate portion by a connecting rod 17 to an eccentric crank 16 that rotates in conjunction with the lower shaft.

Reference numeral 18 denotes a rod that is slidably supported by the frame, has a knife 19 attached to its upper end, and has a piece 20 pivoted to its lower end that fits into the two-pronged lever of the knife arm 15.

Therefore, in a state where the knife arm 15 and the knife lever 13 are connected by the clutch mechanism, the movable knife 19 reciprocates in the vertical direction of the needle by the knife lever which is oscillated by the eccentric crank 16, and cooperates with a fixed blade (not shown). move to perform cloth cutting motion.

Next, the clutch mechanism and its operating device in the operating mechanism of the overlocking looper and movable knife will be described in detail with reference to FIGS. 1 to 4.

Vertical holes 23, 24 of the same diameter which can communicate with each other are bored in the clutch body 6 and the lever 2 of the looper actuating mechanism for overlocking, respectively, at their connecting portions, so that both vertical holes 23, 24 are connected to each other.
4 has an R-shaped tip and two notches 25 at the top and bottom.
A flanged pin 26 formed with a flange is slidably inserted into the clutch body so that both the clutch body and the lever can be releasably connected.

27 is a horizontal hole 28 that communicates with the vertical hole 23 of the clutch body 6.
A steel ball inserted therein is urged by a spring 29 to engage the notch 25 of the pin, and has the function of holding the pin in either the upper or lower position.

30 is screwed into the horizontal hole 28 and comes into contact with the spring 29,
Moreover, it is a screw that can adjust the strength of the spring.

The pin 26 is further provided with a pair of flanges 31 and 31 with a gap between them at the upper part thereof, and in the gap between the flanges is a guide plate which is bent and formed on the other side of the actuating plate 32 whose one end is pivoted to the frame. 33 is engaged.

Here, the engaging portion of the guide plate is formed in a circular arc centered on the support shaft 1 so as to constantly engage with the pin during the swing motion of the pin 26 around the support shaft 1.

Reference numeral 35 denotes an operating lever whose base is pivoted to the frame, whose free end protrudes from a slit 36 in the frame, and whose protruding part serves as a handle, and which is formed in the middle of the operating lever on the lower side of the operating plate 32. A pin 37 that engages with the arc-shaped recess 34 is attached.

Reference numeral 38 denotes a spring that is hooked between the actuating plate 32 and the operating lever 35, and this spring presses the lower side of the actuating plate against the pin 37 and pushes the flanged pin 26 downward via the actuating plate. It has the function of lowering the

When the handle is operated and the actuating plate is pivoted, the flanged pin 26 slides against the steel ball 27 biased by the spring 29, and the clutch body 6 and the lever 2 are engaged and disengaged. .

When the connection between the lever 2 and the clutch body is released, the clutch body becomes rotatable with respect to the support shaft 1, and the overlocking looper descends due to its own weight.

At this time, the lowering of the overlocking looper is prevented by a stopper (not shown) after reaching the lower part of the throat plate 39.

On the other hand, in the movable knife actuation mechanism, as in the above-mentioned looper actuation mechanism, the knife lever 13 and the knife arm 15 are provided with horizontal holes 40 and 41 of the same diameter at their respective connecting portions so as to communicate with each other. A flanged pin 42 having an R-shaped tip is slidably inserted into the horizontal hole.

The flanged pin 42 is formed with a pair of flanges 43, 43 at one end with a gap, and the pivot shaft 14 of the guide plate 45 is bent on one side of a driven plate 44 whose intermediate portion is pivoted to the frame.
It engages with an arcuate edge centered at .

The driven plate 44 further has a long groove 46 formed at the other end thereof, and a mounting pin 48 is inserted into the protruding plate 42 which is formed to protrude to the negative side of the actuating plate 32 .

When the actuating plate 32 pivots, the flanged pin 26 slides vertically, and the driven plate 44 pivots, causing the flanged pin 42 to slide laterally (see FIG. 3).

As a result, the knife lever 13 and the knife arm 15 are disengaged from each other, and the movable knife 19 is brought into an operative or inoperative state.

When the connection between the female lever 13 and the female arm 15 is released,
The knife lever becomes free to rotate, and the movable knife descends together with the rod 18 that supports the dirt due to its own weight.
When the looper reaches the lower part of the throat plate, it is stopped by engaging with a stopper (not shown), which is similar to the above-mentioned overlocking looper.

In addition, in order to ensure that the movable knife is in the inoperative position when the knife lever 13 and knife arm 15 are disconnected, the knife lever 13 may be rotated counterclockwise by a bullet in FIG. 2. good.

Although not shown, the flanged pin 42 also has the flanged pin 26.
A similar notch is provided to hold it in place.

In addition, when the pins 26 and 42 are lowered when the clutch body 6 and the lever 2 are connected, and when the female lever 13 and the female arm 15 are connected, care must be taken to prevent the tips of the pins from coming off the lever 2 or the female lever 13 and falling. The lever 2 and the female lever 13 are formed with receiving portions 2' and 15' that bulge in the lateral direction so as to be in constant contact with the lever or female lever in such a position.

The present embodiment is constructed as described above, and when used as a chain stitch sewing machine, the operation lever 35 is operated from the solid line position to the imaginary line position in FIG. 3.

As a result, the actuating plate 32 pivots clockwise, lifts the pin 26, releases the connection between the lever 2 and the latch body 6, and pivots the driven plate 44 counterclockwise.

The counterclockwise pivoting of the driven plate pulls out the pin 42 to the right and releases the connection between the knife lever 13 and knife arm 15.

In this state, the pin 37 of the operating lever 35 separates from the recess 34 on the lower side of the operating plate, rides up to the imaginary line position and stops, while the flanged pins 26 and 42 are also held at that position by the steel balls that engage with the notches. Retained.

Thus, the overlocking looper and the movable knife simultaneously become inoperative and descend below the throat plate, as described above.

Thereafter, chain stitching is performed using only the chain stitch looper.

On the other hand, when switching to the overlock sewing machine by activating the hem looper and movable knife from the above state,
This is done by operating the operating lever 35 from the imaginary line position toward the solid line position.

Lever 2 and clutch body 6 and female lever 13 and female arm 1
5, when connecting with the flanged pins 26 and 42, the vertical hole 23
, 24 and the horizontal holes 40 and 41 do not communicate with each other, the vertical holes 24 and the horizontal holes 41 corresponding to the vertical holes 23 and 40 communicate with each other during one revolution of the pulley. The pin 26.42 is fitted into the vertical hole 23 of the lever and the horizontal hole 40 of the female lever by the elastic force of the spring 38.

At this time, as mentioned above, since the tips of the pins 26 and 42 are rounded, even if the two sets of holes 23, 24 and the horizontal holes 40, 41 do not match perfectly, the vertical hole 23 and the horizontal hole 40
If the pins 26 and 42 are even slightly engaged with each other, the pins 26 and 42 receive the driving force from the spring 38, and the cam action at the tips of the pins 26 and 42 align the two sets of holes 23 and 24 and the horizontal holes 40 and 41. and is inserted into the horizontal hole 40.

As described above, the overlock sewing machine of this invention can be used as both an overlock sewing machine and a chainstitch sewing machine by allowing the overlocking looper and movable knife to be selectively activated or inactive. Moreover, since the above-mentioned selection operations of the edge looper and the movable knife can be performed simultaneously with a single operation, switching between an overlock sewing machine and a chainstitch sewing machine can be performed easily and quickly.

[Brief explanation of the drawing]

Fig. 1 is a rear view showing the looper operating mechanism for edging, Fig. 2 is a side view showing the movable knife operating mechanism, and Fig. 3 is a partially cross-sectional view showing the looper for edging and the locking/disengaging device for the movable knife. The bottom view shown in FIG. 4 is an exploded perspective view. 1...Spindle, 2...Lever, 4...
...Lower shaft, 5...Crank, 6...
Clutch body, 10... looper for overlocking, 1
3... Female lever, 14... Support shaft, 1
5... Female arm, 23.24... Vertical hole,
26...flange pin, 32...operating plate,
35...operation lever, 38...spring,
40.41... Horizontal hole, 42... Flange pin, 44... Driven plate.

Claims (2)

[Scope of utility model registration request] (1) An overlocking looper operating mechanism consisting of a chain stitch looper, an overlocking looper, and a link mechanism that operates in conjunction with the lower shaft to reciprocate the hemlocking looper in the vertical direction of the throat plate; It has a movable blade for cutting cloth and a movable blade operating mechanism that moves the movable blade up and down in conjunction with the lower shaft, and is capable of safety sewing using a twin needle and over-edge sewing using a single needle. In the lock sewing machine, the overlocking looper operating mechanism includes a lever that swings in conjunction with the lower shaft, and a clutch body that is coaxially supported with the lever so that it can swing independently of the lever. and a first locking body that is attached to either the clutch body or the lever and removably engages with the other to connect or disconnect the two, or a movable blade actuation mechanism. is a female lever that swings in conjunction with the lower shaft, a female arm that is coaxially supported with the female lever so that it can swing independently from the female lever, and is attached to either the female lever or the female arm. and a second locking body that removably engages with the other to connect or release the connection, and the first and second locking bodies in both mechanisms are each a link device. When the first locking body releases the connection between the lever and the clutch body, and the second locking body releases the connection between the female lever and the female arm, the above-mentioned Both mechanisms are inactive and chain stitching is performed using only the looper for chain stitching, but when each crank and lever are connected by the locking body, both mechanisms are in an active state and safety stitching or safety stitching is performed using the double needle. An overlock sewing machine that can perform overlock stitches using a single needle. (2) The overlock sewing machine according to claim 1, wherein either one of the first and second locking bodies is connected to an operating handle provided on the outside of the frame via an actuating device.