JP3474221B2 - Drive release device for multi-head sewing machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of suspending an arbitrary one of a plurality of sewing machine heads and performing a sewing operation only with the remaining heads. The present invention relates to a driving force release device for a multi-head sewing machine for holding a needle bar and a balance of a head in a stopped state. 2. Description of the Related Art Conventionally, in a needle bar and a balance of each head in a multi-head sewing machine, power transmission from respective drive mechanisms can be interrupted by individual clutches. Therefore, the needle bar and the balance of the rest head are switched to the power transmission cut-off state, whereby the needle bar and the balance are kept stopped. [0003] However, in order to stop the needle bar and the balance of the rest head, it is necessary to switch each clutch individually. For this reason, work is troublesome, and there is a possibility that switching of one of the clutches is forgotten. The technical problem of the present invention is to simplify the trouble of stopping the needle bar and the balance of the pause head by making it possible to shut off both the power transmission to the needle bar and the balance by operating the interlocking operation member. At the same time, it is also necessary to avoid forgetting one of the operations. [0004] In order to solve the above-mentioned problems, a driving force canceling device for a multi-head sewing machine according to the present invention is configured as follows. That is, in the multi-head sewing machine, each of a plurality of sewing heads includes a needle bar that moves up and down in conjunction with a needle bar driving mechanism, and a balance that reciprocates and rotates in conjunction with a balance driving mechanism. It has a needle bar clutch that can shut off power transmission from the mechanism to the needle bar, a balance clutch that can shut off power transmission from the balance drive mechanism to the balance, and an interlocking operation mechanism. And this ream
The moving operation mechanism is an interlocking member that is rotated by its driving operation.
The power transmission of both clutches is interrupted through
It is possible to switch to the state in which According to this structure, the power transmission of both the needle bar clutch and the balance clutch can be cut off by driving the interlocking operation mechanism of the sewing machine head to be stopped.
Wear. Therefore, separate the needle bar clutch and the balance clutch.
Workability is improved compared to switching by another operation
I do. Next, an embodiment of the present invention will be described with reference to the drawings. First Embodiment FIG. 3 is a partially cutaway front view of one sewing head 10 in a multi-head sewing machine, and FIG. 4 is a cross-sectional view taken along line AA of FIG. In these drawings, a sewing machine arm 12 mounted on a sewing machine frame penetrates a sewing machine main shaft 14 which rotates by receiving a rotational driving force from a predetermined driving source (not shown). And this sewing machine spindle 1
On the shaft 4, a needle bar driving cam 16 and a balance driving cam 18 are provided inside the sewing machine arm 12 so as to rotate together with the sewing machine main shaft 14. As shown in FIG. 4, a needle bar case 34 is mounted on the front surface of the sewing machine arm 12 so as to be slidable in the width direction (the left-right direction in FIG. 3). A plurality of needle bars 36 are provided in the needle bar case 34 so as to be able to move up and down, and a balance shaft 59 fixed to the upper portion of the needle bar case 34 corresponds to the needle bar 36. Number balance 58
Are rotatably supported. However, in FIG.
Only one of the balance 58 and the balance 58 is shown. As is well known, when the needle bar case 34 is controlled to slide based on the color change signal of the sewing thread, only one selected needle bar 36 and the balance 58 corresponding to the needle bar case 36 will be described below. The driving mechanism 20 and the balance driving mechanism 50 receive the driving force to be driven. As shown in FIG. 4, the needle bar drive mechanism 20 includes the needle bar drive cam 16, a needle bar drive link 22 for converting the rotation of the cam 16 into a reciprocating motion of up and down, and a needle bar drive link. A drive base 30 and a needle bar drive member 32 which move up and down along a base needle bar 28 fixed to the sewing machine arm 12 while receiving an operation of
And the subject. This needle bar driving member 32
A pair of upper and lower engaging pieces 33 which can be engaged with an engaging pin 38 fixed to a substantially intermediate portion of the needle bar 36 are formed on the front surface of the needle bar 36. That is, the engagement pin 38 of the needle bar 36 selected by the slide control of the needle bar case 34 is engaged with the engagement piece 33 of the needle bar drive member 32, and only this needle bar 36 is It is driven up and down in conjunction with the elevating operation. FIG. 3 shows a state where the drive base 30 and the needle bar driving member 32 are at the bottom dead center, and FIG. 4 shows a state where they include the needle bar 36 at the top dead center. Next, the needle bar drive mechanism 20 sends the needle bar 36
The needle bar clutch 40 that can shut off power transmission to the needle bar will be described. First, the needle bar driving member 32 of the needle bar driving mechanism 20
It is rotatable around the axis of the base needle bar 28 with respect to the drive base 30, and is normally held at the rotation position in FIGS. 3 and 4 by the force of a spring (not shown). As shown in FIG. 3, a double-axis type jump motor (pulse motor) 42 is mounted on the side wall of the sewing machine arm 12. One end of a motor shaft 44 of the motor 42 is located inside the sewing machine arm 12 and a jump lever 46 is provided.
Is fixed, and the other end portion has an interlocking operation mechanism S described later.
The driven member 92 which is one of the components is fixed. The roller 48 rotatably attached to the tip of the jump lever 46 is in light contact with the flat surface 32a of the needle bar driving member 32, as is clear from FIG. Then, when the jump lever 46 rotates in conjunction with the driving of the jump motor 42 based on a predetermined jump signal, the flat surface 32a of the needle bar driving member 32
8, the needle bar driving member 32 rotates around the axis of the base needle bar 28. As a result, the engagement piece 33 of the needle bar drive member 32 is disengaged from the engagement pin 38 of the needle bar 36, and power transmission to the needle bar 36 by the needle bar drive mechanism 20 is cut off. On the other hand, the balance driving mechanism 50 is mainly composed of the balance driving cam 18 and a balance driving link 52 for converting the rotation of the balance driving cam 18 into reciprocating rotation. The balance drive link 52 is, as shown in FIGS. 3 and 4, a first drive lever 5 supported to rotate individually with respect to a support shaft 53 fixed to the sewing machine arm 12.
4 and a second drive lever 56. However, these drive levers 54 and 56 are configured to rotate integrally as long as the balance clutch 60 described below is in the connected state. A cam follower 55 provided at the end of the first drive lever 54 is engaged with the groove of the balance driving cam 18 (groove cam), and is rotated around the support shaft 53 by the rotation of the balance driving cam 18. I do. Further, a sector gear 56 meshable with a gear portion 58a formed on the outer periphery of the boss portion of the balance 58 is provided at the tip of the second drive lever 56.
a is formed. The gear portion 58a of the balance 58 selected by the slide control of the needle bar case 34 engages with the sector gear 56a, and only the balance 58 reciprocates in conjunction with the rotation of the drive levers 54 and 56. repeat. Next, the balance driving mechanism 50 outputs the balance 58
The balance clutch 60 capable of blocking power transmission to the balance will be described. As is apparent from FIG. 4 and FIG. 1 to be described later, the base end of the engagement arm 62 is rotatably connected to the second drive lever 56, and the distal end of the engagement arm 62 is An engagement pin 63 engageable with an engagement recess 64 of the first drive lever 54 is fixed. And the engagement arm 62
Receives the action force of a spring (not shown) in a direction in which the engagement pin 63 is engaged with the engagement recess 64 of the first drive lever 54, and always receives the first drive lever 54 and the second drive lever 56. And are held together. Further, the balance clutch 60 is provided with a release lever 66.
The support shaft 67 of the release lever 66 is provided as shown in FIG.
As shown in the figure, the side wall of the sewing machine arm 12 is rotatably supported via a flanged bearing sleeve 68 penetrating therethrough. By rotating the release lever 66 in the clockwise direction in FIG. 4 together with the support shaft 67, the engagement arm 62 is moved to the engagement pin 63 and the first drive lever 54.
Is disengaged from the engagement recess 64 in the direction of disengagement. As a result, the integrated state of the first drive lever 54 and the second drive lever 56 by the balance clutch 60 is released, and power transmission to the balance 58 by the balance drive mechanism 50 is interrupted. FIG. 5 is a left side view of FIG. 3, and FIG. 1 is a perspective view showing the needle bar clutch 40 and the balance clutch 60 together with their interlocking operation mechanism S. The interlocking operation mechanism S of the needle bar clutch 40 and the balance clutch 60 will be described mainly with reference to these drawings and FIG. First, the jump motor 42 in the needle bar clutch 40
A bracket 86 is attached to the end face on the side where the driven member 92 is provided with a spacer 87 interposed therebetween so as not to hinder the movement of the driven member 92 as shown in FIG. A shaft 89 is rotatably supported by the bracket 86. A cam member 88 is fixed to one end of the shaft 89 inside the bracket 86 so as to be adjacent to the driven member 92. An operating member 90 is fixed outside the bracket 86. This operating member 90
Are held at two rotational positions by alternate contact between locking surfaces formed at two places on the outer periphery of the boss portion and the end of the torsion spring 91 fixed to the bracket 86. I have. On the other hand, a boss 81 of an interlocking member 80 is fixed to the support shaft 67 of the release lever 66 of the balance clutch 60 at an outer end of the sewing machine arm 12 (an end opposite to the release lever 66). . This interlocking member 80
Is a first lever end 8 extending in two directions from the boss portion 81.
2 and a second lever end 84. A pin 83 is fixed to the shorter first lever end 82,
The longer second lever end 84 is operatively connected to the operating member 90 through a link plate 94. The motor bracket 71 fixed to the sewing machine arm 12 includes
A motor (pulse motor) 70 as a drive source of the interlocking operation mechanism S is mounted. A drive arm 74 engaged with a pin 83 of a first lever end 82 of the interlocking member 80 is fixed to a motor shaft 72 of the motor 70. Next, the operation of the above configuration will be described. First, the interlocking operation mechanism S when the sewing head 10 is performing a normal sewing operation is held, for example, in a state shown in FIGS. 1 and 5. In other words, the operating member 90 at this time is held at a predetermined rotation position by contact between one of the locking surfaces and the torsion spring 91, so that the interlocking member 80 and its related members are also in the predetermined state. Is held. In this state, the jump lever 46 of the needle bar clutch 40 remains held at the solid line position in FIG. 1 or the position in FIG. 4 unless a jump signal is input to the jump motor 42. Therefore, the needle bar 36 is driven up and down in conjunction with the raising and lowering operation of the needle bar driving member 32. The balance clutch 60 is connected to the first drive lever 54 and the second drive lever 5 of the balance drive mechanism 50.
6 are integrally connected, and the balance 58 repeats reciprocating rotation in conjunction with the rotation of both drive levers 54 and 56. However, even during this sewing operation, when the jump lever 46 is rotated to the position indicated by the imaginary line in FIG. 1 by the drive of the jump motor 42 based on the jump signal, the needle bar drive member 32 and the needle bar drive member 32 are already described. Needle bar 3
6 is disengaged from the engagement pin 38, and the transmission of power to the needle bar 36 by the needle bar drive mechanism 20 is cut off. When the sewing machine head 10 is to be stopped, the motor 70 of the interlocking operation mechanism S is driven, and the interlocking member 80 is driven through the drive arm 74 of the motor shaft 72.
Is rotated together with the support shaft 67 as shown in FIG.
At this time, the operating member 90 is substantially 90 ° from the state shown in FIG.
After rotation, the torsion spring 91 comes into contact with a different locking surface than before, and is held at the rotation position in FIG. The cam member 88 also rotates as shown in FIG. 2 through the shaft 89 at the same time as the rotation of the operating member 90, and pushes the driven member 92 fixed to the motor shaft 44 of the jump motor 42. This allows the jump lever 46 to be moved in the same manner as when the jump signal is input to the jump motor 42.
Is rotated, and the needle bar clutch 40 is held in a state where power transmission to the needle bar 36 by the needle bar drive mechanism 20 is cut off. When the interlocking member 80 rotates together with the support shaft 67, the release lever 6 of the balance clutch 60 is moved.
6 rotates clockwise. As a result, as described above, the engagement pin 63 of the engagement arm 62 is disengaged from the engagement recess 64 of the first drive lever 54, and the balance clutch 60
The first drive lever 54 and the second drive lever 56
Is released from the integrated state. As a result, the transmission of power to the balance 58 by the balance driving mechanism 50 is maintained in a cut-off state. Instead of driving the motor 70, the operating member 90 is manually moved from the state of FIG.
, The needle bar clutch 40 and the balance clutch 60 can both be in the power cutoff state. Second Embodiment FIG. 6 is a partially cutaway front view of a sewing head 10 according to a second embodiment, and FIG. 7 is a left side view thereof. In this embodiment, a jump drive lever 100, which reciprocates and rotates in conjunction with the rotation of a jump cam (not shown) fixed on the shaft of the sewing machine main shaft 14, is rotatable on the jump lever 46 of the needle bar clutch 40. Is joined to. Normally, the jump drive lever 100 merely repeats relative rotation with respect to the jump lever 46 by the rotation of the sewing machine main shaft 14. Then, when the solenoid 102 mounted on the sewing machine arm 12 is energized based on a predetermined jump signal, the plunger protrudes so as to prevent the relative rotation of the jump drive lever 100 with respect to the jump lever 46. As a result, the jump lever 46 rotates around its rotation axis (coaxial line with the solenoid 102) in conjunction with the jump drive lever 100, and the needle bar drive mechanism 20 transmits the needle bar 36 as in the first embodiment. Power transmission to the vehicle. In the balance driving mechanism 50, the first driving lever 54 and the second driving lever 56 are rotated integrally. Therefore, the balance clutch 60 of the present embodiment enables the support shaft 110 of both drive levers 54 and 56 to slide with respect to the sewing machine arm 12, and slides the support shaft 110 together with the drive levers 54 and 56 to perform the first drive. The cam follower 55 of the lever 54 can be removed from the cam groove of the balance driving cam 18. However, both drive levers 54 and 56 are rotatable with respect to the support shaft 110, and the support shaft 110 is urged by a spring 112 in a direction to engage the cam follower 55 with the cam groove of the balance drive cam 18. . Next, the interlocking operation mechanism S of this embodiment will be described. First, an operation member 120 is provided near the jump lever 46 in the needle bar clutch 40. The shaft 122 of the operating member 120 is
Is supported so as to be rotatable with respect to the side wall of the shaft and to be able to move slightly in the axial direction. A lever 124 which can contact the roller shaft 49 of the jump lever 46 is fixed to an end of the shaft 122. ing. One lock pin 126 is fixed to the operation member 120, and the lock pin 126 is engaged with one of two lock holes formed on the side wall of the sewing machine arm 12 to operate the lock member 126. The rotation position of the member 120 is regulated. On the other hand, an engaging member 130 is fixed to an end of the support shaft 110 in the balance clutch 60,
Detent pin 132 provided on this engagement member 130
Is inserted into a hole formed in the sewing machine arm 12 to prevent the support shaft 110 from rotating with respect to the sewing machine arm 12. A pin 137 of a bell crank 136 rotatably attached to a bracket 134 fixed to the sewing machine arm 12 is engaged with a groove 131 formed on an outer peripheral portion of the engaging member 130. The bell crank 136 and the operation member 120 are connected to each other by the interlocking member 1.
38 are connected so as to be linked with each other. In the second embodiment, the interlocking operation mechanism S when the sewing head 10 is performing a normal sewing operation is held in a state shown in FIGS. Therefore, in the needle bar clutch 40, the jump lever 46 does not rotate unless a jump signal is input to the solenoid 102, and the needle bar 36 is driven up and down in conjunction with the lifting and lowering operation of the needle bar driving member 32. You. On the other hand, in the balance clutch 60, the cam follower 55 of the first drive lever 54 is held in a state engaged with the cam groove of the balance drive cam 18, and the balance 58 reciprocates in synchronization with the rotation of the balance drive cam 18. repeat. However, if the plunger of the solenoid 102 protrudes based on the jump signal even during this sewing operation, the jump lever 46 rotates in conjunction with the jump drive lever 100 as described above,
Power transmission from the needle bar drive mechanism 20 to the needle bar 36 can be cut off. FIGS. 8 and 9 show the rest state of the sewing head 10 in correspondence with FIGS. When the sewing machine head 10 is stopped, first, the operating member 120 is pulled in the axial direction in the state shown in FIG.
From the lock hole of the sewing machine arm 12 and FIG.
9 and the lock pin 126 is engaged with another lock hole for positioning. Operation member 12 at this time
With the rotation of 0, the lever 124 fixed to the shaft 122 also rotates as shown in FIGS. 8 and 9 and pushes the roller shaft 49 of the jump lever 46. As a result, the jump lever 46 rotates in the same manner as in the case based on the jump signal, and the needle bar clutch 40 is held in a state where power transmission to the needle bar 36 by the needle bar drive mechanism 20 is cut off. Further, with the rotation of the operation member 120, the bell crank 136 rotates to the state shown in FIGS. Thus, the support shaft 110 of the balance clutch 60 slides in the axial direction together with the two drive levers 54 and 56 against the elasticity of the spring 112,
The cam follower 55 of the first drive lever 54 comes off the cam groove of the balance drive cam 18. Therefore, the balance driving mechanism 50
The power transmission from the balance to the balance 58 is interrupted. In FIGS. 6 to 9 showing the second embodiment, members that are considered to be the same as or equivalent to those in the first embodiment are denoted by the same reference numerals, and redundant description will be omitted. As described above, according to the present invention, the operation of the interlocking operation mechanism can cut off the transmission of power to both the needle bar and the balance of the rest head, simplifying the operation and simplifying the operation by forgetting the operation. Of the power transmission of the vehicle is not interrupted.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an interlocking operation mechanism of a needle bar clutch and a balance clutch. FIG. 2 is a perspective view showing an interlocking operation mechanism of a needle bar clutch and a balance clutch when the sewing machine head is at rest. FIG. 3 is a front view showing one sewing head partially broken away. FIG. 4 is a sectional view taken along the line AA of FIG. 3; FIG. 5 is a left side view of the sewing head. FIG. 6 is a front view showing the sewing head according to the second embodiment with a part cut away. FIG. 7 is a left side view of the sewing head according to the second embodiment. FIG. 8 is a front view of the sewing machine head at rest, partially broken away. FIG. 9 is a left side view of the sewing machine head at rest. [Description of Signs] 10 Sewing machine head 20 Needle bar drive mechanism 36 Needle bar 40 Needle bar clutch 50 Balance drive mechanism 58 Balance 60 Balance clutch S Interlocking operation mechanism

Continuation of front page (56) References JP-A-2-23988 (JP, A) JP-A-4-303497 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) D05B 1 / 00-97/12

Claims (1)

(1) A plurality of sewing heads each having a needle bar that moves up and down in conjunction with a needle bar drive mechanism, and a balance that reciprocates and rotates in conjunction with a balance drive mechanism. A needle bar clutch capable of interrupting power transmission from the needle bar drive mechanism to the needle bar, a balance clutch capable of interrupting power transmission from the balance drive mechanism to the balance, and an interlocking operation mechanism. With
This interlocking operation mechanism is an interlocking mechanism that is rotated by the driving operation.
The power transmission of both clutches is interrupted through the moving member.
A driving force release device for a multi-head sewing machine that can be switched to the disconnected state .