JPH07268762A - Embroidering sewing machine - Google Patents

Abstract

PURPOSE:To enable optimum sewing with an embroidering sewing machine to carry out the embroidering by selectively using plural yarns both in the case of selecting either one yarn to perform a loop sewing and in the case of selecting another yarn to perform a ring sewing. CONSTITUTION:A rotating direction position controlling means is placed between each looper 125 and a follower gear 27 for engaging the looper with a driving gear. The rotational direction position of each looper is independently settable to the position for ring sewing and the position for loop sewing by the rotating direction position controlling means when the looper reaches a needle-dropping position to engage the follower gear with the driving gear and rotate the follower gear synchronously with the vertical reciprocating motion of a hook needle 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an embroidery sewing machine in which a plurality of loopers are selectively used so that threads loaded in the loopers can be used interchangeably to perform embroidery sewing on cloth.

[0002]

2. Description of the Related Art The technical matters relating to this type of embroidery sewing machine are:
For example, it is disclosed in JP-A-5-239757.
The contents of the publication are as described in the following "Public technology column". In addition, FIG. 1, FIG. 2 and FIG.
In the accompanying drawings, FIGS. 8, 9 and 10 are shown in order in order to distinguish them from FIGS.

Publicly known art section "(Omitted) ... Figs. 1 and 2 show one bed 1 in a multi-head embroidery sewing machine. Such a bed 1 is shown in FIG.
A plurality of them are arranged side by side in the left-right direction. A sewing machine head is provided above each bed 1. In FIG. 2, a vertically movable needle for sewing provided on the sewing machine head is designated by a symbol.
Indicated by 11. The bed 1 is provided with a plurality of loopers 4, a drive gear 2 for selectively driving the loopers 4, and other various mechanisms described below. (Omitted) The bed frame 1a of the bed 1 is composed of a frame main body 6 attached to the sewing machine frame 5 of the multi-head embroidery sewing machine and a top plate 7 put on the main body 6. A needle plate 8 is attached to the top plate 7 as is well known. The needle plate 8 is provided with a needle hole 9 and a thread pulling hole 10. (Omitted) ... Next, the drive gear 2 and the mechanism related thereto will be described. As shown in FIGS. 1 and 2, a support bracket 13 is fixed to the frame body 6, and the drive gear 2 is attached to the upper end of a vertical drive shaft 14 rotatably mounted on the bracket 13. As shown in FIGS. 2 and 3, the guide gear 16 is formed to have the same diameter and the same pitch as the drive gear 2, and the teeth of the drive gear 2 and the teeth of the guide gear 16 are overlapped with each other with respect to the drive gear 2. It is provided. In this example, the guide gear 16 and the drive gear 2 are integrally formed. After the two are formed separately, they may be fixed to the drive shaft 14 in the above mutual relation. Guide gear 16
Has a partly toothless portion 16a as shown in FIG. The range of the toothless portion 16a is set to be large enough to prevent meshing with the driven gear when the driven gear laterally moves as described later. A horizontal main shaft 17 is provided so as to penetrate a large number of beds 1 and is rotatably supported by the frame body 6. Although not shown, a drive source such as a motor for rotating the main shaft 17 is connected to the main shaft 17 as is well known. The main shaft 17 and the drive shaft 14 are interlocked by gears 18 and 19 fixed to each other. As the gears 18 and 19, for example, screw gears are used. .. (Omitted) The plurality of loopers 4 are looper assemblies shown in FIGS.
It is provided as one component of 21. Looper assembly
21 has a movable frame 3. A rail 22 is attached to the frame body 6, and a slide body 23 movable on the rail 22 is attached to the movable frame 3. As a result, the movable frame 3 is linear with respect to the frame body 6 in the left-right direction in FIG. To be able to move laterally. Bed 1 with many horizontal moving rods 24
1, and is supported by the frame body 6 so as to be movable back and forth in the left-right direction in FIG. 1 (movable in the axial direction of itself). Although not shown, a drive device for laterally moving the horizontal rod 24 is connected to the horizontal rod 24. The movable frame 3 is fixed to the lateral moving rod 24, and the movable frame 3 moves laterally as the lateral moving rod 24 moves laterally. The direction of lateral movement of the movable frame 3 may be, for example, a direction that draws an arc locus in a horizontal plane. As shown in FIG. 2, a vertical hollow looper shaft 26 is mounted on the movable frame 3 so as to be freely rotatable and movable in the vertical direction. The looper 4 is attached to the upper end of the looper shaft 26, and the driven gear 27 is attached below the looper 4. The looper 4 has a needle drop hole 28 and a threading hole 29 as shown in FIGS. A plurality of loopers 4 for the movable frame 3 are arranged at equal intervals in a direction parallel to the moving direction of the movable frame 3. Therefore, the lateral movement of the movable frame 3 causes each looper 4 to be selectively positioned at the needle drop position, that is, the position where the needle drop hole 28 overlaps the needle hole 9 of the needle plate 8. At the bottom of each looper shaft 26, a connecting piece
A connecting member 43 including 45 is mounted by a bearing 44 so as to be relatively rotatable. The connecting member 43 includes a guide piece 46.
A guide member 48 is provided on a mounting piece 47 fixed to the movable frame 3. The guide member 48 guides the guide piece 46 so as to move only in the vertical direction, and the swinging of the connecting piece 45 in the lateral direction is prevented. (Omitted) Next, the bed 1 is provided with an elevating mechanism 32 for repositioning the looper 4 in the needle drop position in the axial direction thereof as shown in FIGS. 2 and 9. (Omitted) Next, the operation of the embroidery sewing machine will be described. At the time of normal sewing, the looper 4 in the needle drop position is in the raised position as shown in FIG. 2 by the elevating mechanism 32, and its driven gear 27 meshes with the drive gear 2. In this state, the main shaft 17 is reciprocally rotated, and the looper 4 is reciprocally rotated via the gears 18 and 19, the drive shaft 14, the drive gear 2, and the driven gear 27 as is well known. As is well known, this rotation is performed in synchronization with the vertical movement of the sewing hook 11. Further, on the top plate 7, the cloth stretched on the embroidery frame is intermittently laterally moved in synchronization with the vertical movement of the hook 11. As a result, the sewing of the cloth on the needle plate 8 is performed by the sewing thread 120 supplied through the threading hole 29 of the looper 4. ........ (Omitted) Next, the replacement of the looper for changing the sewing thread will be described.
In this case, the operation is performed in exactly the same manner as the above case up to the time point 210 in FIG. When the operation up to that point is completed, the driven gear 27 of the looper shaft 26 meshes with the toothed portion 16b of the guide gear 16 as shown in FIG.
The cam 52 rides on the detent piece 51. Then, in that state, the guide gear 16 is rotated in the direction of the arrow X by the main shaft 17. In the rotation process, the driven gear 27 is interlocked with the rotation of the guide gear 16 in the arrow X direction in the state where the driven gear 27 meshes with the toothed portion 16b of the guide gear 16 as shown in FIG. And rotate. Eventually, as shown in FIG. 8B, the driven gear 27 moves from the toothed portion 16b of the guide gear 16 to the toothless portion 16a.
Then, the rotation of the driven gear 27 stops there. Further, at the time of this stop, the fitting concave portion 54 of the cam 52 fits with the rotation stopping piece 51 as shown in FIG. As a result, the phase of the looper 4 in the direction of rotation remains the same as when the driven gear 27 was disengaged from the toothed portion 16b of the guide gear 16, and the threading hole 29 of the looper 4, for example, as shown in FIG. It is held at the 4:30 position. In order to achieve such a state, the cam 52 is preliminarily adjusted in the rotational direction relative to the driven gear 27 in a state where the push screw 53 is loosened, and in that state, the push screw 53 causes the looper shaft 26 to move to the looper shaft 26. It is fixed. .. (Omitted) The guide gear 16 is continuously rotated in the direction of the arrow X to reach the state shown in FIG. 8C. In this state, next, the movable frame 3 is laterally moved by, for example, the direction of arrow 212 in FIG. In the case of the lateral movement, all the driven gears 27 laterally move through the toothless portion 16a as shown in FIGS. 10 and 11, so that the looper 4 naturally does not rotate at all. By the lateral movement of the movable frame 3, the looper 4 to be operated next as shown in FIG. 11B (the looper 4 is previously loaded with a thread of a color or type different from that of the looper previously operated). Is brought to the needle drop position. The looper 4 is also held by the looper phase holding means 50 so that its position in the turning direction is in a predetermined state in the same manner as described above. .. (Omitted) When the new looper 4 comes to the needle drop position, the guide gear 16 is then rotated in the direction of arrow Y in FIG. 8C by the rotation of the main shaft 17. When the toothed portion 16b of the guide gear 16 reaches the position as shown in FIG. 8B, the driven gear 27 meshes with the toothed portion 16b and starts rotation. The cam 52 rotates with the rotation of the driven gear 27. Then, the cam 52 turns off the stopper 51.
8A, the fitting recess 54 is disengaged from the rotation stopper 51, and the state as shown in FIG. In the above case, the driven gear 27
As is clear from the above description, the looper phase holding means 50 holds the state as it was when it was disengaged from the toothed portion 16b. Therefore, when the toothed portion 16b starts to mesh with the driven gear 27, the meshing is started very smoothly without the tooth tip of the driven gear 27 and the tooth tip of the toothed portion 16b colliding with each other. When the driven gear 27 meshes with the toothed portion 16b of the guide gear 16 as described above,
The lifting body 34 is lifted by the rotation of the operation shaft 39 of the lifting mechanism 32, and the looper shaft 26 is lifted via the connecting member 43. As a result, the driven gear 27 reaches the drive gear 2 by using the teeth of the guide gear 16 as guides, and the looper 4 reaches the operation place during sewing as shown in FIG. After that, the operation after the time of reference numeral 210 in FIG. 14 is performed in the same manner as the above case. ]

In the embroidery sewing machine as described above, the timing of the vertical movement of the hook needle and the rotation of the looper, that is, when each looper comes to the needle drop position and rotates in synchronization with the vertical movement of the hook needle, The mutual relationship between the vertical movement and the rotation of the looper is matched with the loop sewing, that is, the sewing method for forming the loop 122 by pulling up the sewing thread 120 for each stitch as shown in FIG. With such a setting, when loop sewing is to be performed using any thread, the loop sewing can be properly performed. Not only that,
As for the chain stitch, the above timing is not so severe. Therefore, even when the chain stitch is to be sewn by using another thread, the chain stitch can be performed without any problem in the case of the strongly twisted thread which is usually used.

[0005]

However, in the embroidery sewing machine having the above-mentioned settings, when attempting to perform chain stitch using a thread of sweet twist, some fibers in the thread do not hang on the hook portion of the hook needle. When a situation occurs, the sewing result of the chain stitch becomes very unsightly, or even with chain stitches using a strong twist thread,
Similarly, since some fibers will not be hooked on the hook,
There has been a problem that the sewn finish has a lot of fuzz.

The embroidery sewing machine of the present invention is provided to solve the above-mentioned problems (technical problems) of the prior art. A first object is to provide an embroidery sewing machine capable of performing embroidery by selectively utilizing various threads loaded in a plurality of loopers. A second object is to provide an embroidery sewing machine that can properly perform loop sewing when performing loop sewing with any thread. A third object of the present invention is to provide an embroidery sewing machine that can perform chain stitching with a different thread so as to obtain a good sewing finished state. A fourth object is to provide an embroidery sewing machine which can properly perform chain stitching by using a special thread such as a sweet twisted thread. Other objects and advantages will be readily apparent from the drawings and the following description related thereto.

[0007]

In order to achieve the above object, in the embroidery sewing machine of the present invention, a sewing hook needle is arranged above the bed so that it can be moved up and down toward the needle drop position of the bed. A movable frame is movably arranged below the bed, and a plurality of loopers are arranged on the movable frame so that the movable frame can be selectively moved to the needle drop position by the lateral movement of the movable frame. , A driven gear is attached to each looper, and the driven gear is rotated at a position where it meshes with the driven gear of the looper located at the needle drop position in the bed in synchronization with the vertical movement of the hook needle. In an embroidery sewing machine having drive gears for driving gears, a rotation for changing the relative positional relationship between the looper and the driven gear in the rotation direction is provided between each looper and the driven gear. It is provided with directional position adjusting means.

[0008]

With the rotation direction position adjusting means provided for each looper, the looper loaded with the thread for loop sewing determines the position in the rotation direction when the driven gear associated therewith meshes with the drive gear. The looper loaded with the thread for chain stitching can also have its rotational position set at the optimum position for chain stitching. When performing embroidery on cloth, loop sewing can be selectively performed using the former looper and chain stitching can be selectively performed using the latter looper. Since each of these loopers can be set to the above-mentioned optimum position, no matter which sewing method is used, the thread can be reliably hooked on the hook portion of the hook needle and pulled up properly to perform reliable sewing.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. The members denoted by reference numerals 3, 7, 11, 26 and 27 in FIGS. 1 and 2 are movable frames in a known multi-head embroidery sewing machine (for example, known in Japanese Patent Laid-Open No. 5-239757).
The top plate, the hook needle, the looper shaft, and the driven gear are shown respectively. The relationship between each of these members and their relationship with other members is the same as the structure related to each of the corresponding members and their relationship with other members described in the above-mentioned publicly known art section. In FIGS. 1 and 2, parts that are functionally the same as or equivalent to those shown in FIGS. 8 to 21 and whose description is considered to be duplicated are denoted by the same reference numerals as those in FIGS. The description is omitted. In the present application, the bed shown in FIG. 1 is the top plate 7 and the needle plate 8 provided therein.
And the looper is a configuration including the looper shaft 26 and the head member 125a attached to the upper end thereof. The hook needle 11 is arranged above the bed so as to be vertically movable toward the needle hole 9 which is the needle drop position of the bed, and the movable frame 3 is movable laterally below the bed. For example, it is arranged so that it can move laterally in a direction perpendicular to the plane of FIG. A plurality of loopers are arranged on the movable frame so that the movable frame can be selectively positioned at the needle drop position by lateral movement of the movable frame. A plurality of the looper shafts 26, for example, 5 are the movable frames 3
Are arranged side by side in the lateral movement direction, and each of them is selectively positioned at the needle drop position of the hook needle 11 (the position below the needle hole 9) by the lateral movement of the movable frame 3. Driven gear 27
The one connected to the looper located at the needle drop position meshes with the drive gear provided on the bed.

Next, reference numeral 125a indicates a head member of the looper 125, and the looper shaft 2 is inserted into a hole 126a provided in a lower mounting portion 126.
Insert the upper end of 6 and set the looper shaft with the setscrews 127 and 128.
It is fixed at 26. Reference numeral 130 denotes a connecting means between the looper 125 and the driven gear 27, which is a member 131 which is an upper end portion of the looper shaft 26 and functions as a connecting piece, a boss portion 27a for attaching the driven gear 27 to the member 131, An example of the push screw 124, the mounting portion 126, and the push screws 127 and 128 described above is shown. Reference numeral 132 denotes a rotation direction position adjusting means provided between the looper 125 and the driven gear 27 in order to change the relative positional relationship between them in the rotation direction, and is exemplified by one constituted by the push screws 127 and 128. . The rotation direction position adjusting means is shown in FIG.
As shown by an imaginary line, a head member 125a is provided with a tongue piece 133 that overlaps with the upper surface of the driven gear 27, and a through hole is formed in the tongue piece 133, while the upper surface of the passive gear 27 has the above-mentioned through hole. A large number of screw holes adapted to be selectively polymerized are provided side by side on one circular arc, and the tongue piece 133 is selectively attached to any one of the screw holes by a set screw 134 so that the looper 125 and It may be configured so that the relative positional relationship with the passive gear 27 can be changed.

The setting of the rotation direction position of the looper 125 in the above-mentioned structure will be described. Among the plurality of loopers 125 rotatably attached to the movable frame 3, the position of the looper 125 for loop stitching in the rotation direction is set to the loop stitch optimum position. That is, when the looper 125 is located at the needle drop position and the driven gear 27 meshes with the driving gear that rotates in synchronization with the vertical movement of the hook needle 11, for example, the drive for moving the hook needle 11 up and down. The rotation angle of the main shaft is 0 ° (a position called the origin, which is a reference position when determining the timing between members that operate in synchronization with each other in the sewing machine. This position is uniquely determined for each sewing machine. Has been
The scale attached to the drive spindle can be used for direct visual reading, and the encoder or photosensor attached to the drive spindle can be used for electrical detection. ), The position of the threading hole 29 seen from the needle drop hole 28 of the looper 125 is set to the 9 o'clock position. The 9 o'clock position means that the time dial at 6 o'clock is the front side of the multi-head embroidery sewing machine (the side on which the operator handles the sewing machine, the lower side in FIG. 8). ), When the projection is superposed on the looper 125, it means the position where 9 o'clock on the time scale of the dial is located. The same applies to other times. On the other hand, the position in the rotation direction of the looper 125 for loop sewing is set to the optimum loop sewing position. That is, the position is set to 10 o'clock as in the case of the chain stitch. The above setting may be performed with the looper 125 in the holding position instead of the needle drop position. In that case, the setting may be performed in consideration of the difference between the rotation direction position of the looper 125 at the holding position and the rotation direction position of the looper 125 at the needle drop position.

Sewing using the looper 125 set at the optimum position for chain stitching will be described with reference to FIGS. The orientation of the looper in FIG. 3 is set to 0 when the threading hole 29 is at the 9 o'clock position in order to allow intuitive comparison with FIGS. Whether it is the side of the rotation or the side of the counterclockwise rotation is shown together with the magnitude of the rotation angle. Further, in FIG. 4, the direction of the hook portion 11b of the hook 11a of the arrow 11a is shown, and the arrow 121a indicates the cloth 121 for each sewing of one needle.
Indicates the moving direction of. The above-mentioned sewing is performed by the vertical movement of the hook needle 11 and the reciprocating rotation of the looper 125 synchronized with the vertical movement of the hook needle 11 in the state shown in FIGS. In this case, since the looper 125 is set to the optimum position for chain stitching, when the sewing thread 120 is hooked on the hook portion 11b of the hook needle 11, the winding angle of the thread 120 with respect to the hook needle 11 is compared as shown in FIG. Big Therefore, all the fibers constituting the sewing thread 120 are surely hooked on the hook portion 11b, and they are surely pulled up on the cloth 121 by the raising of the hook needle 11. Therefore, a beautiful sewn state can be obtained without causing fluffing of some fibers.

Looper 12 set at the optimum position for loop sewing
Sewing using No. 5 will be described with reference to FIGS. Figure 5
The direction of the looper in is the same as that in the case of FIG.
In this case, the sewing proceeds from the state (A) of FIG. 6 to the state (B) as the hook needle 11 descends, and the position where the needle tip 11c of the hook needle 11 intersects the sewing thread 120 is lowered as shown in FIG. 7B. Head towards. In this case, as apparent from FIGS. 7A and 7B, since the sewing thread 120 is retracted laterally from the passage of the needle tip 11c, the hook needle 11 descends without interfering with the sewing thread 120. Then, as shown in FIGS. 7C and 7D, the sewing thread 120
Is entangled in the hook 11. Then, the hook needle 11 is raised to pull up the entangled sewing thread 120 to the upper side of the cloth 121, and the cloth 121 is laterally moved by the amount of the first stitch, resulting in a state similar to that of FIG. 6A. . Loop sewing is performed by repeating such an operation.

When embroidering on the cloth 121 by selectively utilizing various sewing methods, the plurality of loopers 125 are selectively positioned at the needle drop position by the lateral movement of the movable frame 3, and the loops are looped. In the looper 125 set for sewing, the cloth 121 is embroidered by chain stitch, and in the looper 125 set for loop sewing, the cloth 121 is embroidered by loop stitch. Such sewing is performed by automatic control, for example, and various embroidery is applied to the cloth 121.

[0015]

As described above, according to the configuration of the present invention, even when the above-described first to fourth objects are achieved and loop sewing is performed by selectively using any thread, another thread is used. Even when the chain stitch is selectively used, there is an effect that the embroidery can be performed in a state in which an appropriate stitch finish is obtained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a looper, a driven gear, and a connecting means for the both.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a graph showing an operation of a needle tip and a looper for chain stitching.

4 (A) and (C) are plan views showing the state of the looper at points A and C in FIG. 3, respectively, and (B) and (D) are BB in (A) and (C), respectively. A line sectional view and a DD sectional view.

FIG. 5 is a graph showing the operation of the looper for needle point and loop sewing.

6A and 6B are vertical cross-sectional views showing the state of the hook needle at the time points A and B in FIG. 5, respectively.

7 (A) and (C) are plan views showing the state of the looper at the time points 7A and 7C in FIG. 5, respectively, and (B) and (D) are BB in (A) and (C), respectively. Line sectional view and DD
FIG.

FIG. 8 is a plan view of the sewing machine bed with the top plate removed.

9 is a sectional view taken along the line II-II in FIG. 8 (the top plate is shown, but the yarn cutting mechanism is not shown in order to avoid congestion in the figure).

FIG. 10 is a diagram illustrating an operation sequence of looper switching.

[Explanation of symbols]

 7 bed 11 hook 27 driven gear 120 thread for sewing 125 looper

Claims (1)

[Claims] 1. A sewing hook needle is arranged above the bed so as to be vertically movable toward a needle drop position of the bed, and a movable frame is arranged below the bed so as to be movable laterally. A plurality of loopers are disposed on the movable frame so that the needle can be selectively positioned at the needle drop position by lateral movement of the movable frame, and a driven gear is attached to each looper. In the embroidery sewing machine, the drive gear for driving the driven gear, which is adapted to rotate in synchronization with the vertical movement of the hook needle, is provided at a position where the driven gear of the looper located at the drop position meshes with the looper. An embroidery sewing machine characterized in that a rotational direction position adjusting means for changing the relative positional relationship between the looper and the driven gear in the rotational direction is provided between the driven gear and the driven gear.