JPH1057651A - Sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely return a sewing machine to the operation state, by making the thread take up lever of a machine head be at rest when a part of machine head is operated. SOLUTION: Thread take up levers 15 each supported by each machine head are driven by a machine main shaft 10 equipped through a plurality of machine heads in this sewing machine. This sewing machine is composed of a drive cam 18 fixed on the machine main shaft 10, a first lever 20 engaging a cam follower 24 equipped on the swing end side with a cam groove 18a of the drive cam 18, a second lever 21 engaging a drive element 26 equipped on the swing end side with the driven part of a thread take up lever, a link lever 22 with one end pivotally supported by the second lever 21 and a link part 22a on the other end is detachably linked to a link part 30 of the first lever 20, an energizing means 32 to energize the link part 22a of the link lever 22 and usually linked to the link part 30 of the first lever 20, and a control mechanism 35 to act to release the link part 22a of the link lever 22 from the link part 30 of the first lever 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine having at least two sewing machine heads, and more particularly, to operating only a part of a plurality of sewing machine heads and operating the remaining sewing machine heads. The present invention relates to a sewing machine in which the movement of a balance provided in the sewing machine head during the suspension of the operation can also be suspended.

[0002]

2. Description of the Related Art In a so-called multi-head sewing machine having two or more sewing heads, each sewing head has a built-in balance. Each balance is connected to a sewing machine spindle commonly penetrated by a corresponding sewing machine head via a driving force conversion mechanism such as a cam or a link, and the balance of all the sewing machine heads is provided by rotation of the sewing machine spindle. Synchronous driving is performed. In this type of multi-head sewing machine, it is often used to operate only a part of the plural sewing machine heads and suspend the operation of the remaining sewing machine heads. In such a case, it is preferable to suspend the operation of the balance of the sewing machine head during the suspension of operation. Accordingly, a configuration in which the drive of the balance is stopped for the idle sewing head of the multi-head sewing machine is filed by the present applicant (Japanese Patent Laid-Open No.
23988).

[0003]

The "balance suspending and driving device for the sewing machine head during rest" disclosed in the above-mentioned patent publication requires a balance driving arm driven by a driving cam fitted to the main shaft of the sewing machine. , The cam follower is disengaged from the cam groove of the driving cam, thereby interrupting the transmission of the driving force to the balance of the sewing machine head during the pause. Is very useful in that the object of the invention can be suitably achieved. However, in general, the cam follower needs to be fitted to the cam groove in a state where an appropriate play and a smooth movement are coexistently secured. Therefore, the gap between the cam follower and the cam groove is necessarily required to be set to be extremely small, but in this case, when the cam follower once detached is fitted into the cam groove again, it is fitted between the two members. There are problems that can cause mistakes. That is, in the balance driving suspension device according to the above proposal, when the sewing machine head that has been suspended is restarted, a situation in which the corresponding balance does not operate due to the fitting error sometimes occurs.

[0004]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned difficulties in which a conventional multi-head sewing machine is inherent, and has been proposed to appropriately solve the problem. Operate only some sewing heads,
When the operation of the remaining sewing heads is suspended, the operation of the balance provided in the suspended sewing head can be easily suspended, and the return from the suspended state to the operating state can be performed smoothly and reliably. It is an object of the present invention to provide a sewing machine that has been described above.

[0005]

SUMMARY OF THE INVENTION In order to overcome the above-mentioned problems and to achieve the intended object, the present invention provides a method for rotating a plurality of sewing machine heads arranged in parallel to each other by rotating a sewing machine main shaft. In a sewing machine configured to drive a swingably supported balance, a drive cam fixed to the main shaft of the sewing machine inside each of the sewing machine heads, and a cam follower provided to be swingable and provided at a swing end side thereof. And a second lever, which is also swingably supported, and a driver provided on the swing end side of the first lever is engaged with a driven portion of the balance. A linking lever having one end pivotally supported by the second lever and a linking portion at the other end being removably linked to a linking portion provided on the swing end side of the first lever; and By urging the connecting portion of And biasing means for interlocking the linkage portion of the lever, the interlocking portion of the interlocking lever, characterized by being composed of the control mechanism operates to disengage from the connecting portion of the first lever.

[0006]

In the state where the linking portion of the linking lever is linked to the linking portion of the first lever by the biasing force of the biasing means, the swinging motion of the first lever, which is rocked by the rotation of the drive cam, is transmitted through the linking lever. The balance is transmitted to the second lever, and the balance is reliably engaged between the driver and the driven portion of the balance, whereby the balance is driven to swing. In addition, when the control mechanism is operated and the connecting portion of the connecting lever is disengaged from the connecting portion of the first lever against the urging force of the urging means, the rotation of the driving cam causes the first lever to swing. Nevertheless, since the swinging motion is not transmitted to the second lever, the driving force is not transmitted to the balance, and the movement of the balance is stopped.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment in which a sewing machine according to the present invention is applied to a multi-needle, multi-head type embroidery sewing machine will be described with reference to the accompanying drawings. As shown in FIGS. 1 and 2, an upper frame 2 is disposed above a horizontal sewing table 1, and a plurality of sewing heads 3 (eight in this embodiment) are arranged at equal intervals on the front surface of the upper frame 2. It is juxtaposed. A lower frame 6 is arranged on the lower surface of the sewing machine table 1, and a hook base 5 for supporting the shuttle 4 is installed on the lower frame 6 in correspondence with each sewing head 3. An embroidery frame 7 for extending and holding an embroidery object such as a cloth is movably mounted on the upper surface of the sewing machine table 1, and a frame driving mechanism (not shown) disposed below the sewing machine table 1 is used to move the embroidery frame 7 on a plane coordinate. Can be freely moved in the X direction and the Y direction. The frame driving mechanism is driven based on embroidery data from a computer (not shown).

Each sewing head 3 is shown in FIGS.
As shown in FIG. 3, the sewing machine comprises a sewing machine arm 8 protrudingly fixed to the front surface of the upper frame 2 and a support case 9 slidably supported on the front surface of the arm 8 in a lateral direction. One sewing machine spindle 10 is attached to each corresponding sewing machine arm 8.
The needle bar drive mechanism (not shown) disposed inside the sewing machine arm 8 and, in particular, the balance drive mechanism 12 shown in FIG. It has become so.

In the inside of the support case 9, a plurality of needle bars 14 (six in this embodiment) holding sewing needles 13 at the lower end.
Are movably supported up and down, and a balance 15 corresponding to each needle bar 14 is slidably supported. That is, the balance 15 is supported by fitting its boss portion 16 to a support shaft 17 extending horizontally inside the support case 9. The respective support cases 9 are connected to each other by connecting rods (not shown), and are integrally slid in the lateral direction by the operation of the operator. One needle bar 14 and one balance 15 selected by the slide operation are driven by a needle bar drive mechanism (not shown) and a balance drive mechanism 12 described later.

The balance driving mechanism 12 is, as shown in FIG.
A driving cam 18 fixed to the sewing machine main shaft 10, a first lever 20 which is oscillated by the driving cam 18, and a second lever 21 which finally oscillates the balance 15
And a connecting lever 22 that connects the first lever 20 and the second lever 21. Therefore, the details of these configurations will be further described. 6, one end of the first lever 20 is swingably supported by a shaft 23, and a cam follower 24 supported on the swing end is driven by a cam groove 18a of the drive cam 18 provided on the sewing machine main shaft 10. Are fitted together. 2nd lever 2
1 has one end side pivotally supported by a shaft 25,
A roller 26 functioning as a driver is rotatably supported on the swing end side. The roller 26 is used for the balance 1
5 is engaged with the boss 16 in the following manner. That is, the boss portion 16 of the balance 15 has a fitting recess 16 that allows the roller 26 (drive element) to be fitted in the axial direction.
a is formed as a driven part of the balance 15. By operating the support case 9 and sliding it in the horizontal direction, the balance 15 selected together with the needle bar 14 is selected.
Also slides laterally, so that the fitting recess 16a of the boss 16 of the balance 15 is
Are fitted from the axial direction.

As shown by a solid line in FIG. 4, the boss portion 16 of each of the balances 15 is formed with an engagement groove 16b that opens downward in a substantially top dead center position. This engagement groove 16
b is fixed to the upper surface of the front part of the sewing machine arm 8 and is fitted to the support rail 27 extending in the lateral direction of the support case 9 so that each balance 15 is held in the above-described substantially top dead center position. It has become. A notch 27a is formed substantially at the center of the support rail 27, as shown in FIG. In the balance 15 selected by the above-mentioned sliding operation, the engaging groove 16b of the boss 16 is disengaged from the support rail 27 at the notch 27a, and the fitting recess 16a of the boss 16 is The two levers 21 are fitted to the rollers 26.

Next, as shown in FIG. 6, a linking lever 22 is swingably supported via a pin 28 near the swinging end of the second lever 21. On the free end side of the connecting lever 22, a fitting concave portion 22a which opens rearward is formed, and the fitting concave portion 22a is a roller 3 of the first lever 20 described below.
It is designed to function as a link with 0. That is, the first lever 20 has a roller 30 coaxially with the cam follower 24 provided on the swing end side thereof, and the roller 30 functions as a linking portion with the fitting recess 22 a of the linking lever 22. In addition, both ends of the torsion spring 32 are attached to the second lever 21 and the connecting lever 22 by screws 31,
The connecting lever 22 is urged clockwise around the pin 28 by the elastic urging force of the torsion spring 32. This allows the connecting lever 22
The fitting recess 22a of the first lever 20
, From the front in the radial direction, so that they fit almost tightly. At the lower end of the connecting lever 22, an engaging recess 2 that opens downward and is adjacent to the fitting recess 22a.
2b is formed, which can be inserted into and out of an engagement pin 38 of a control mechanism 35 described later.

As shown in FIGS. 4 to 6, a control mechanism 35 which operates to detach the fitting recess 22 a of the connecting lever 22 from the roller 30 is disposed below the connecting lever 22. The control mechanism 35 includes an actuator 36 typified by a rotary solenoid attached to the sewing machine arm 8 and a swing arm 37 fixed to a rotation shaft 36 a of the actuator 36. An engagement pin 38 projecting in the horizontal direction is provided. The engagement pin 38 can be loosely fitted into an engagement recess 22b provided in the connecting lever 22 as described later.
When the actuator 36 is in a non-operating state, the swing arm 37 rotates counterclockwise by the urging force of a built-in spring (not shown), and is brought into contact with a stopper (not shown). It stands by at the angular position shown in FIG. 4 (this position is called the "standby position"). When the actuator 36 is actuated, the swing arm 37 rotates clockwise, and rotates to an angular position (this position is referred to as an “operation position”) indicated by a solid line (partially imaginary line) in FIG. It is supposed to.

Next, the operation of the multi-needle, multi-head type embroidery sewing machine according to this embodiment will be described. During the normal operation of the sewing machine, the actuator 36 is in a non-operating state, so that the swing arm 37 of the control mechanism 35 is waiting for operation at the standby position. In this state, when the main shaft 10 of the sewing machine rotates in one direction, the driving cam 18 also rotates, and the first lever 20 reciprocates around the shaft 23 as a pivot point under the engagement between the cam groove 18a and the cam follower 24. Move. Since the fitting recess 22a of the connecting lever 22 is fitted to the roller 30 of the first lever 20 by the urging force of the torsion spring 32, the swinging motion of the first lever 20 is performed via the connecting lever 22. The power is transmitted to the second lever 21. Since the roller 26 as a driver in the second lever 21 is engaged with the fitting recess 16a formed in the balance 15, the roller 26 is pivotally moved about the shaft 25 of the second lever 21 as a pivot point. The balance 15 is also driven to swing back and forth. The connecting lever 22 moves up and down between the lower position and the upper position indicated by the solid line and the imaginary line in FIG. 4, but when the connecting lever 22 reaches the lower position, the engaging recess 22b at the lower end of the lever is moved. Are externally fitted from above the engagement pin 38 of the control mechanism 35. However, fitting recess 2
2b does not interfere with the engagement pin 38.

Next, an operation for shifting the balance 15 to the stop state will be described. When the sewing machine is stopped,
As shown by the solid line, the balance 15 is located at approximately the top dead center, and stops in the same posture as the balance 15 not selected. In this state, the connecting lever 22 is at the lower position, and therefore, the engaging concave portion 22b of the connecting lever 22 is fitted to the engaging pin 38 of the swing arm 37 of the control mechanism 35 as shown in FIG. . Here, when the actuator 36 is operated, the swing arm 37 rotates toward the operating position. For this reason, the engagement pin 38 engages with the engagement recess 22 b, so that the connecting lever 22 rotates counterclockwise around the pin 28 against the urging force of the torsion spring 32.

When the swing arm 37 reaches the operating position shown in FIG. 5, the fitting recess 22a of the connecting lever 22 is held in a state where it is completely separated from the roller 30 of the first lever 20. Therefore, thereafter, when the main shaft 10 of the sewing machine is rotated, the first
The lever 20 swings, but the balance 15 remains stopped together with the second lever 21. By forming the hook 40 in the opening of the engaging recess 22b, the engaging pin 38 is effectively prevented from coming off the engaging recess 22b. Further, while the swing arm 37 rotates toward the operating position, the second lever 21 slightly swings via the link lever 22, whereby the balance 15 slightly swings. When the swing arm 37 reaches the operating position, the balance 15 is designed to return to the same posture as the balance 15 not selected, as shown in FIG. Therefore, when the needle bar 14 and the balance 15 are selected, the support case 9 can be slid in the lateral direction without canceling the balance pause state.

When the operation of the actuator 36 is released, the swing arm 37 is returned to the standby position by the biasing force of the built-in spring, and the connecting lever 22 is released by the biasing force of the torsion spring 32. Returning to the position shown by the imaginary line in FIG.
1 is connected. As a result, the sewing machine spindle 1
When 0 is rotated, the balance 15 is driven to swing. Therefore, in the case of this embodiment, the sewing machine head 3 has a total of eight heads. For example, when only the rightmost one head is operated, all the actuators 36 of the other sewing machine heads 3 are actuated. The balance 15 of the sewing machine head 3 can be brought into a rest state. In the sewing machine head 3 to be stopped, the needle bar 14 is also naturally set to the stopped state. That is, the needle bar 14 is held in a jump state by a known jump mechanism (not shown) provided in the needle bar drive system.

In the illustrated embodiment, a multi-needle, multi-head sewing machine having a plurality of the same type of multi-needle heads has been exemplified. However, a sewing head having a different sewing type is configured as a pair, and one or more pairs of sewing heads are formed. The present invention can also be applied to a combined type of sewing machine and the like. The swing arm 3 in the control mechanism 35
Instead of performing the drive of the actuator 7 by an actuator 36 such as a rotary solenoid shown in the figure, an electric motor or a pneumatic actuator may be used. Further, instead of providing the engaging pin 38 on the swing arm 37 and performing an arc motion, a linear motion may be imparted by a linear motion type actuator.

[0019]

As described above, according to the sewing machine according to the present invention, only a part of the plurality of sewing machine heads of the sewing machine is operated, and the rest of the sewing machine heads are stopped. In addition, since it is not necessary to engage and disengage the cam groove and the cam follower as in a conventionally known device, the difficulty of causing a fitting error when the detached cam follower is fitted into the cam groove is completely eliminated, The balance can be smoothly and reliably returned to the operating state.

[Brief description of the drawings]

FIG. 1 is a front view of a multi-needle, multi-head sewing machine according to a preferred embodiment.

FIG. 2 is a side view of a sewing machine head in the sewing machine shown in FIG.

FIG. 3 is a front view of the sewing head shown in FIG. 2;

FIG. 4 is an explanatory diagram illustrating an operating state of the balance.

FIG. 5 is an explanatory diagram illustrating a rest state of the balance.

FIG. 6 is an exploded perspective view showing a drive system of the balance.

[Explanation of symbols]

 3 Sewing machine head 10 Sewing machine spindle 15 Balance 16a Fitting concave part (driven part) 18 Drive cam 18a Cam groove 20 First lever 21 Second lever 22 Linking lever 22a Fitting concave part (linking part) 22b Engaging concave part 26 Roller (drive 30) Roller (coupling part) 32 Torsion spring (biasing means) 35 Control mechanism 36 Rotary solenoid (actuator) 37 Swing arm

Claims (6)

[Claims] 1. A balance (15) swingably supported by each of the sewing machine heads (3) is driven by rotation of a sewing machine main shaft (10) penetrating through a plurality of sewing machine heads (3) arranged side by side. The sewing machine spindle (1) is provided inside each of the sewing machine heads (3).
0), and a cam follower (24), which is swingably supported and provided on the swing end side thereof, is engaged with a cam groove (18a) of the drive cam (18). A lever (20), and a second lever (21), which is also pivotably supported and has a driver (26) provided on the pivot end thereof engaged with a driven portion of the balance (15). One end is pivotally supported by the second lever (21), and the other end of the connecting portion (22a) is freely detachable from a connecting portion (30) provided on the swing end side of the first lever (20). Linking lever (22) linked to
An urging means (32) for urging the linking portion (22a) of the linking lever (22) to always link with the linking portion (30) of the first lever (20); and A sewing machine, comprising: a control mechanism (35) that operates to detach the connecting portion (22a) of (22) from the connecting portion (30) of the first lever (20). 2. The sewing machine head (3) includes a plurality of balances (15).
The driven part (16a) of the arbitrarily selected balance (15) is selectively engaged with the driver (26) of the second lever (21), and the operation of the control mechanism (35) By the connecting lever (22)
Even if the connecting portion (22a) of the first lever (20) is disengaged from the connecting portion (30) of the first lever (20), the position of the driver (26) in the second lever (21) is the same as that of the balance (15). 2. The sewing machine according to claim 1, wherein the selecting operation can be maintained in a possible state. 3. The first lever (20) is connected to a roller (3).
0), and the connecting portion of the connecting lever (22) has a fitting recess (2) that can be fitted to the roller (30) from its radial direction.
3. The sewing machine according to claim 1, wherein the sewing machine is configured as 2a). 4. The sewing machine according to claim 1, wherein the control mechanism is a sewing machine arm.
Actuator (36) mounted on the
A swing arm (37) connected to (36) and driven to swing,
An engagement pin (38) provided at one end of the swing arm (37) and removably fitted into an engagement recess (22b) formed at the other end of the link lever (22); Actuator
The swing arm (37) is swung by (36), and the engagement pin (3
The sewing machine according to claim 1, wherein the engaging recess (22a) of the connecting lever (22) is disengaged from the connecting portion (30) by engaging the engaging recess (8) with the engaging recess (22b). . 5. The connecting recess (22b) at the other end of the connecting lever (22) is formed adjacent to a connecting portion configured as the fitting recess (22a). Sewing machine. 6. An engaging recess (2) in said connecting lever (22).
2b), a hook portion (40) is formed in its opening, and the engaging pin (38) engaged with the engaging concave portion (22b) is
5. The sewing machine according to claim 4, wherein the engagement is prevented from being released by the hook portion.