JPH0458360B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) This invention relates to a cloth cutting knife device for a hole sewing machine, and more specifically, it is applied to the peripheral edge of a portion of cloth to be sewn, where a hole such as a buttonhole is formed. After sewing the thread for stitching, the hole is made by cutting the area with a fabric knife, but if the fabric knife does not work, the fabric presser foot should not come up from the table of the sewing machine. This invention relates to a cloth cutting knife device for a hole sewing machine which is equipped with a mechanism to notify an operator that the cloth cutting knife is not operating.

(Prior art) According to the cloth cutting knife device of a hole sewing machine, when thread is sewn into the periphery of a part of cloth to be sewn where a hole such as a buttonhole is to be formed, this sewing operation is performed. If the upper thread does not break until near the end of sewing, the cloth cutting knife falls into the area of the fabric where the hole is to be formed, such as a buttonhole, after sewing is completed, and cuts the hole. If the thread breaks, the thread breakage detection wire detects this and activates the knife stopper lever to prevent the cloth cutting knife from falling onto the fabric, thereby preventing incomplete stitching.

(Problem to be solved by the invention) However, in the cloth cutting knife device of the conventional hole sewing machine, the cloth cutting knife does not fall even if the needle thread breaks due to improper adjustment of the thread breakage detection wire or for some other reason. Occasionally, the worker will be able to recognize the operation of the cloth cutting scalpel by the sound of the operation or the movement of the knife, and the worker may not notice, and in this case, the product may be shipped without holes such as buttonholes. I had a problem with it.

This invention solves the problems of the prior art described above, and its purpose is to provide a cloth cutting knife device for a hole sewing machine that can notify the operator that the cloth cutting knife is not operating. be.

(Means for solving the problem) In order to achieve the above object, the invention of claim 1 provides the following:
While pressing the object to be sewn onto the table with a cloth presser, thread is sewn into the periphery of the area where a hole such as a buttonhole is to be formed, for sewing the hole, and when the sewing is finished, the cloth cutter is operated to cut the area. A cloth cutting knife device for a hole sewing machine is equipped with a blocking means for blocking the movement of a presser lifting lever that operates the cloth presser, and when the cloth cutting knife does not operate, the blocking means is used. It is characterized by being configured so that the presser lifter lever is in an immovable state.

Further, in the invention of claim 2, the blocking means includes:
A rotatable safety arm member provided with a locking groove that locks on the presser lifting lever; and a lock piece that is supported by a drive lever that drives the cloth cutting knife and releasably locks on the safety arm member. When the cloth cutting knife does not operate, the safety arm member is locked by the locking piece to prevent the locking groove from coming off the presser-lifting lever, and to keep the presser-lifting lever in an immovable state. It is characterized by what it did.

Further, in the invention according to claim 3, the blocking means includes a solenoid installed near the presser lifting lever, a detection means for detecting the operation of the cloth cutting knife, and operates the solenoid based on a detection signal from the detection means. the control means operates the solenoid in response to a detection signal from the detection means when the cloth cutting knife is not activated;
The present invention is characterized in that the presser lifting lever is configured to be in an immovable state.

(Function) In the invention of claim 1, the cloth cutting knife does not operate,
When there are no holes such as buttonholes made in the fabric to be sewn, even if you try to pull up the fabric presser foot from the table with the presser lifter lever in order to remove the fabric from the hole sewing machine, the presser lifter lever will not move due to the blocking means. From this, the worker knows that the cloth cutting knife is not working.

In addition, in the invention of claim 2, when the cloth cutting knife does not operate and holes such as buttonholes are not made in the cloth to be sewn, the presser-lifting lever is used to remove the cloth from the overholstering machine. Even if an attempt is made to pull up the presser foot from the table, the locking groove in the safety arm member is locked to the presser lifter lever, and this state is maintained by the lock piece, so the presser foot lever does not move. found out that the cloth cutting knife was not working.

In addition, in the invention of claim 3, when the cloth cutting knife does not operate and holes such as buttonholes are not made in the cloth to be sewn, the presser-lifting lever is used to remove the cloth from the sewing machine. Even if you try to pull up the presser foot from the table, the detection means detects that the cloth cutting knife is not operating, and the control means is actuated to operate the solenoid, so the presser foot lifting lever does not move, and the cloth cutting knife is not activated. I learned that the scalpel wasn't working.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

1 to 6 show one embodiment of the present invention, FIG. 1 is a side view showing the overall outline of the cloth cutting knife device, and FIGS. 2 to 5 explain the operation of the cloth cutting knife device. FIG. 6 is a perspective view showing a cloth presser portion of a hole sewing machine equipped with a cloth cutting knife device.

First, a cloth cutting knife device will be explained with reference to FIG. In the figure, reference numeral 10 is a main cam, 20 is a hook release lever, 30 is a cutoff frame, 40 is a safety arm member, and 50 is a cloth cutting knife.

The main cam 10 is rotated by an upper shaft (not shown) of the sewing machine, and has a cam groove (not shown) formed on its upper surface, and a cam piece 11 on its lower surface.
is provided. When the main cam 10 rotates once, the cloth presser 60 (see FIG. 6) moves on the table 70 (see the same figure) of the sewing machine by a cloth conveying means (not shown) that moves along the cam groove. Move the fabric one sewing cycle. The top portion 11a of the cam piece 11 is provided at the rotational position (sewing start position) of the main cam 10 where this one sewing cycle ends.

Further, the hook release lever 20 is rotatably supported by a sewing machine body (not shown), and has hooks 21 and 22 provided at one end and the other end in the length direction. The hook release lever 20 is biased by a spring (not shown) so that the hook 21 comes into contact with the lower surface of the main cam 10.

In addition, the cutoff frame 30 is for switching the sewing machine to cutoff, high speed operation, and low speed operation, and pin 3
1, and is rotatably supported on the side of the sewing machine main body through a spring 32, and is biased counterclockwise in FIG. 1 by a spring 32. A locking step 33 that locks onto the hook 22 is provided at the lower end of the cutoff frame 30, and a connecting rod 34 connects the cutoff frame 30 and the activation safety arm 41 of the safety arm member 40 at the middle portion. is provided. In addition,
The lower end of the cutoff frame 30 is connected to the starting pedal 80 via a starting link 81 and a chain 82, as shown in FIG. By depressing the starting pedal 80, the starting link 81 is actuated, and the cutoff frame 30 is moved to the first position with the pin 31 as a fulcrum.
Rotates clockwise in Figures 2 and 2.

The safety arm member 40 also includes a cloth presser 60 (sixth
It is rotatably provided near the presser lifting lever 61 that operates the connecting rod 34 (see figure).
The safety arm piece 43 is rotatably attached to the activation safety arm 41 via a pin 42. A locking groove 44 that locks the presser-up lever 61 is provided on one side of the safety arm piece 43. By locking this locking groove 44 with the presser-up lever 61, the presser-up lever 61 prevent the movement of Further, a spring piece 45 is provided between the starting safety arm 41 and the safety arm piece 43, and the spring piece 45 rotates the safety arm piece 43 clockwise in FIG. 1 with respect to the starting safety arm 41. is urged to do so. A stopper 46 is provided at the lower end of the activation safety arm 41, and this stopper 46 receives the lower end of the safety arm piece 43 which is urged to rotate clockwise in FIG.

Further, the upper end of the cloth cutting knife 50 is connected to one end of a knife drive lever 52 via a link 51. The knife drive lever 52 rotates so that one end thereof is lowered when the sewing operation of sewing thread for sewing holes into the periphery of a portion of cloth where a hole such as a buttonhole is to be formed is completed. A cloth cutting knife 50 falls onto a region where a hole such as a cloth buttonhole is to be formed, and makes a hole in the cloth. Furthermore, if the needle thread breaks during sewing, the knife drive lever 52 does not rotate and stops, and the cloth cutting knife 50 does not fall.

A pin 5 is located near the other end of the female drive lever 52.
A lock piece 54 is rotatably attached to the female drive lever 5 through the lock piece 54 and the female drive lever 52 between the lock piece 54 and the female drive lever 52.
A spring piece 55 is provided that biases the spring 2 to rotate clockwise in FIG. 1. Lock piece 5
A claw portion 54a provided at one end of the spring piece 5
It locks with the upper end of the safety arm piece 43 with a spring force of 5.

Next, the cloth presser 60 portion will be explained with reference to FIG.

The cloth presser 60 is constructed by providing a cloth feed plate 64 at one end of the presser arm 62 via a presser foot 63, and when the main cam 10 (see FIG. 1) rotates once, the other end of the presser arm 61 Cloth feed shaft 65 provided in
(which constitutes a part of the cloth conveying means) moves on the table 70 in the left-right direction in FIG.
Further, the fabric presser foot 60 is connected to a presser lifting lever 61 via a link mechanism consisting of a vertical link 66, a horizontal link 67, and a presser bar 68, and can be lifted up from the table 70 by the presser lifting lever 61. There is. That is, when one end of the presser lifter lever 61 is moved downward by stepping on the presser lifter pedal 69b connected to one end of the presser lifter lever 61 via a chain 69a, the vertical link 66 is lowered in conjunction with this. As a result, the horizontal link 67 moves to the right side in FIG.

Next, the operation of the above embodiment will be explained.

In FIG. 1, the hook 21 provided at one end of the hook release lever 20 is in contact with the top 11a of the cam piece 11, and the hook 22 provided at the other end of the hook release lever 20 is in contact with the locking step 3 of the cutoff frame 30.
3, and the blocking frame 30 is "blocking".
Therefore, the upper shaft of the sewing machine is stopped above the needle bar.

In this shut-off state, the locking groove 44 is disengaged from the presser-lifting lever 61, and the presser-lifting lever 61
is in a movable state, that is, in a state in which the cloth presser 60 can be pulled up from the table 70.

When the starting pedal 80 is depressed from this cut-off state, the starting link 81 is actuated as shown in FIG. 2, and the cut-off frame 30 is moved counterclockwise in FIG. Rotate in the direction. This causes the sewing machine's motor (not shown) to operate and rotate the upper shaft, and this rotation of the upper shaft causes the main cam 10 to rotate in the direction of the arrow shown in FIG. When the main cam 10 starts rotating, the hook 2
1 is removed from the top 11a of the cam piece 11, the hook release lever 20 rotates, and the hook 22 is released from the portion 33a of the locking step 33 (see Fig. 2).
The cutoff frame 30 is held in this state (high-speed operation position of the sewing machine) even if the starting pedal 80 is released.

At this time, the activation safety arm 41 is activated by the connecting rod 34.
is rotated clockwise in FIG. 2, and the safety arm piece 43
The locking groove 44 of the presser lever 61 is locked to prevent the presser lever 61 from operating. Further, the upper end portion of the safety arm piece 43 is engaged with the claw portion 54a of the lock piece 54.

When the sewing machine is in high-speed operation, the main cam 10 rotates so that the cloth presser 60 conveys the cloth on the table 70, and the sewing needle moves up and down due to the rotation of the upper shaft, and the sewing machine presses the cloth around the periphery of the area where a hole such as a buttonhole is to be formed. Thread for sewing holes is sewn in.

As one sewing cycle nears its end,
The hook 21 that was in contact with the lower surface of the main cam 10 rides on the portion 11b of the cam piece 11, and as a result, the hook release lever 20 rotates, and as shown in FIG. 33
Lock in b. As a result, the cutoff frame 30 rotates slightly clockwise in FIG. 3, and the sewing machine shifts to a low speed operating state. At this time, the activation safety arm 41 rotates counterclockwise in FIG. 3 due to the connection rod 34 and tries to move away from the presser lifting lever 61, but since the safety arm piece 43 is locked to the lock piece 54, it is not engaged. The stop groove 44 does not come off the presser lifting lever 61.

After this, if the upper thread does not break, the other end of the knife drive lever 52 rotates counterclockwise in FIG. Drop down and make a hole in the area where the hole is to be formed. At this time, as shown in FIG. 4, the upper end of the safety arm piece 43 comes off the lock piece 54, and the spring force of the spring piece 45 causes the safety arm piece 43 to rotate clockwise in FIG. When they come into contact, the locking groove 44 is removed from the presser lever 61.

However, even though needle thread breakage does not occur,
If the cloth cutting knife 50 does not fall, the knife drive lever 52 is not rotating, so the locking piece 54
locks the safety arm piece 43, and the locking groove 44 does not come off from the presser lever 61. Therefore, even if the operator does not notice that the cloth cutting knife 50 does not operate near the end of low-speed operation,
When attempting to lift the cloth presser 60 from the table 70, the operator can know that the cloth cutting knife 50 is not operating because the presser lifter lever 61 does not move.

When one sewing cycle is completed, the state returns to the state shown in FIG. That is, the hook 21 is connected to the cam piece 11.
The hook release lever 20 rotates and the hook 22 comes into contact with the top 11a of the locking step 33.
The cutting frame 30 becomes in the "blocking" state, and the upper shaft of the sewing machine stops at the upper position of the needle bar.

FIG. 7 shows another embodiment of the cloth cutting knife device of the present invention.

In this embodiment, unlike the above-mentioned embodiments, the process is performed electrically. In other words, the cloth cutting knife 5
A sensor 90 for detecting whether or not the cloth cutting knife 50 has operated is disposed near 0, and a solenoid 91 for blocking the movement of the presser lifting lever 61 is arranged near the presser lifting lever 61. In the vicinity of the cutoff frame 30, the position of the cutoff frame 30 (blocking position, high speed operation position, low speed operation position)
A sensor 92 for detecting the
It is designed to control the actions of 1.

When the cutoff frame 30 moves from the cutoff position to the high speed operation position, the sensor 92 detects the movement of the cutoff frame 30, and the control means 9 detects the movement of the cutoff frame 30 based on this detection signal.
3 operates the solenoid 91 to prevent the presser lifting lever 61 from moving. This state is maintained even when the cutoff frame 30 moves from the high speed operating position to the low speed operating position.

When the knife drive lever 52 operates and the cloth cutting knife 50 falls, the sensor 90 detects this, and the control means 93 stops the operation of the solenoid 91 based on this detection signal. As a result, the presser lift lever 61 is released from the solenoid 91. The cutoff frame 30 then returns to the cutoff position. However, if the cloth cutting knife 50 does not fall, the solenoid 91 remains activated and prevents the presser lever 61 from moving. Therefore,
Even when the cutoff frame 30 returns to the cutoff position, the presser lifting lever 61 cannot be raised, and it can be seen that the cloth cutting knife 50 has not fallen. Note that it is also possible to notify by a buzzer or the like without using the solenoid 91.

(Effect of the invention) According to the invention of claim 1 explained above,
When the cloth cutting knife does not operate, the blocking means (safety arm member 40, locking piece 54, solenoid 91, sensors 90, 92, control means 93) prevents the presser lever from moving. Even if you do not notice that the cloth cutting lever has not operated, you can know that the cloth cutting lever has not operated when the presser lifter lever is raised. For this reason,
It is possible to solve the problem of shipping products without holes such as buttonholes.

Further, according to the second aspect of the invention, since the blocking means is composed of the safety arm member and the lock piece, it can be implemented with a simple mechanism.

Furthermore, according to the third aspect of the invention, since there is no mechanical part and the process is performed electrically, reliability can be improved.

[Brief explanation of the drawing]

1 to 6 show one embodiment of the present invention, FIG. 1 is a side view showing the overall outline of the cloth cutting knife device, and FIGS. 2 to 5 explain the operation of the cloth cutting knife device. FIG. 6 is a perspective view showing a cloth presser portion of a hole sewing machine equipped with a cloth cutting scalpel device, and FIG. 7 is a schematic diagram showing another embodiment of the present invention. 40... Safety arm member, 44... Locking groove, 50... Cloth cutting knife, 60... Cloth holder, 61... Presser lifting lever, 90, 92... Sensor, 91... Solenoid, 9
3...Control means.

Claims (1)

[Claims] 1. While pressing the material to be sewn onto a table with a cloth presser, thread for sewing the hole is sewn into the periphery of the area where a hole such as a buttonhole is to be formed, and the cloth is cut at the end of sewing. A cloth cutting knife device for a hole sewing machine that operates a knife to make a hole in the area, is equipped with a blocking means for blocking movement of a presser lifting lever that operates the cloth presser, so that the cloth cutting knife is operated. A cloth cutting knife device for a hole sewing machine, characterized in that the cloth cutting knife device for a hole sewing machine is constructed such that the presser lifter lever is kept in an immovable state by this blocking means when the device is not in operation. 2. The blocking means includes a rotatable safety arm member provided with a locking groove that locks the hold-down lever;
It consists of a lock piece that is supported by a drive lever that drives the cloth cutting knife and is removably engaged with the safety arm member, and when the cloth cutting knife is not operated, the safety arm member is locked by the lock piece and the safety arm member is locked. 2. The cloth cutting knife device for a hole sewing machine according to claim 1, wherein the locking groove is configured to prevent the presser-lifting lever from coming off, and to keep the presser-lifting lever in an immovable state. 3. The blocking means includes a solenoid installed near the presser lifting lever, a detection means for detecting the operation of the cloth cutting knife, and a control means for operating the solenoid based on a detection signal from the detection means, and A cloth cutting machine for a hole sewing machine, characterized in that, when the cloth cutting knife is not operating, the control means operates the solenoid in response to a detection signal from the detection means, so that the presser lifter lever is in an immovable state. Female device.