JP3312283B2 - Yarn selection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thread selecting device which can be used in a sewing machine which performs sewing by selectively using a plurality of threads.

[0002]

2. Description of the Related Art A plurality of needles, each of which receives a supply of sewing thread from an individual thread supply source, are arranged side by side on a horizontally movable frame of a sewing machine head. Is used selectively to perform sewing.

[0003]

In this conventional sewing machine, the number of needles increases as the number of threads that can be selected increases, and there is a problem that the form of the sewing head becomes extremely large.

The present invention has been made to solve the above-mentioned problems (technical problems) of the prior art, and there is provided a sewing machine in which the form of the sewing head can be reduced even if the number of selectable threads is large. It is an object to provide a multi-thread selection device that can be used.

[0005]

A yarn selecting device according to the present invention comprises a selecting device 10 for selecting one of a plurality of yarns supplied from a plurality of yarn supply sources 9 for supplying yarns. ,
Casing 24, a plurality of inlets 33 provided at one end of the casing 24 for introducing a yarn, and a plurality of inlets 33 provided at the other end of the casing 24 and located at the plurality of the inlets 33, respectively. The outlets 34 communicating with the plurality of inlets 33 through the yarn passages 35 and 36 for leading out one yarn selected from the inside, and the yarns introduced into the respective inlets 33 are respectively A plurality of driving means 37 provided in the casing 24 for sending to the outlet 34 by an individual air flow, and an annular air supply for distribution of air to the driving means 37 provided so as to surround the periphery of the casing 24. Road 125
A plurality of valves 133 provided for individually opening and closing the passages with respect to a passage from the air supply passage 125 to each drive means 37 in the casing 24; and a plurality of valves 133 provided around the casing 24. A plurality of electromagnets 146 for individually controlling the valves 133 are provided.

[0006]

When the thread selecting device is mounted on the sewing machine, one of the threads supplied from a plurality of thread supply sources is selected by the selecting device, and the thread is supplied to a sewing needle via a balance. The sewing on the cloth is performed by the operation of the sewing needle to which the thread has been supplied.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. In FIGS. 1 and 2 showing one sewing machine in a multi-head sewing machine, reference numeral 1 denotes a horizontally long base frame of the multi-head sewing machine, which is also called a bridge. Reference numeral 2 denotes one sewing machine provided in the bridge 1. Reference numeral 3 denotes a head of the sewing machine, and reference numeral 4 denotes a head frame, which is mounted on the base frame 1. 5 is a needle bar, 6 is a sewing needle attached to its lower end,
Reference numeral 7 denotes a cloth presser, which is moved up and down by a well-known lifting mechanism. Next, reference numeral 8 denotes a yarn supply device for supplying a yarn to the needle 6. Reference numeral 9 denotes a plurality of yarn supply sources provided in the base frame 1. Reference numeral 10 denotes a selection device attached to the head frame 4 for selecting and sending out a plurality of yarns supplied from the respective yarn supply sources 9. Reference numeral 11 denotes a preparation state return device for returning the state of the plurality of yarns to the selection device 10 to the preparation state. Next, 12 is a well-known balance provided in the middle of the yarn supply path from the yarn supply device 8 to the needle 6, and 13 is a tension device for applying a predetermined tension to the yarn going to the balance 12. It is. 14 is a balance from the selection device 10
Reference numeral 15 denotes a threading device for passing yarn from the balance 12 to the needle 6. 16
Denotes a table surface of the sewing machine, which is provided with a needle plate as well as a well-known shuttle below the table.
A well-known thread cutting device is provided below the needle plate.

Next, the yarn supply source 9 will be described. Each yarn supply source 9 is provided on a pedestal 18 having a tiered shape attached to the base frame 1. Reference numeral 19 denotes a bobbin stand attached to the pedestal 18, and reference numeral 20 denotes a thread for sewing (upper thread). The bobbin stand is wound on the bobbin 21 and stands on the bobbin stand 19.

Next, FIGS. 3 to 8 showing the selection device 10 will be described. The selection device 10 includes a main body 22 and an operating body 23 provided around the main body. First, the main body 22 will be described. In FIG. 3, reference numeral 24 denotes a casing, which comprises a main body member 25 formed in a substantially cylindrical shape, a first guide member 26 having a cone shape, and a second guide member 27 having a cap shape. 1st guide member
26 is connected to the main member 25 at a screw connection portion 26a as shown. The second guide member 27 has a flange 25 with respect to the main body member 25.
a and 27a are used to connect with a set screw 29.
28 is a packing for preventing air leakage. 1st guide member
The outer peripheral side surface of 26 and the inner peripheral side surface of the second guide member 27 are both smooth surfaces so that the yarn can slide smoothly. Next, reference numeral 33 denotes a yarn introduction port provided at the upper end portion of the main body member 25;
(For example, 16
) Are provided side by side. Reference numeral 34 denotes a yarn outlet provided at the axial center position of the lower end of the main body member 25. Reference numeral 35 denotes a yarn holding portion provided inside the main body member 25 at a position corresponding to the introduction port 33, and is a portion for holding the tip of the yarn introduced from the introduction port 33. Are formed in the shape of small through holes communicating with. The holding portions 35 are individually provided for a plurality of yarns, and are arranged on a circumference centered on the axis of the main body member 25 as shown in FIG. 36 in FIG. 3 is a first guide member.
A yarn guide path formed between 26 and the second guide member 27,
The holding unit 35 and the outlet 34 are connected. The guide path 36 is formed as a wide space as shown. 1 and 2
Reference numeral 61 denotes a yarn guide for guiding the yarn toward the introduction port 33.

Referring again to FIG. 3, the driving means for feeding the yarn from the holding portion 35 through the outlet 34 will be described. The driving means is provided with a plurality of first driving means 37 individually provided for each holding section 35 to feed the yarn in each holding section 35 to the middle of the guide path 36, and to the middle of the guide path 36. And a second drive means 38 for sending the yarn from the outlet 34 to the outlet 34. A plurality of the first driving means 37 are arranged on a circumference centered on the axis of the main body member 25. First, FIG. 5 shows the first driving means 37 in detail.
Will be described. The first driving means 37 is configured by providing a plurality of nozzle holes 41 formed in the main body member 25 with nozzle members 42, respectively. The means of attachment to the nozzle member 42 is a threaded part
It is screwed by 42a. Reference numeral 43 denotes a receiving port opened on the outer peripheral surface of the main body member 25, and is formed to be in communication with the nozzle hole 41 as shown in FIG. Reference numeral 46 denotes an annular ventilation path formed around the intermediate portion of the nozzle member 42, and 47 denotes an air guide, which is a cross section as shown in FIG. 5B so that air flows straight downward in parallel with the axis of the nozzle hole 41. A large number of grooves 47 a are formed around the nozzle member 42 in a shape parallel to the axis of the nozzle member 42. 48 is a lower small diameter portion of the nozzle member 42, 49 is a lower small diameter portion of the nozzle hole 41,
These are all formed in a straight shape as shown in the figure,
An air passage 50 having a narrow annular shape and a straight shape in the axial direction is formed therebetween. Reference numeral 51 denotes an outlet at the lower end of the ventilation path 50. Reference numeral 52 denotes a thread passing hole formed in the axial center portion of the nozzle member 42, and an opening at the upper end thereof serves as the thread introduction port 33. The outside diameter of the small diameter portion 48 is, for example, 2.2 mm, the inside diameter of the small diameter portion 49 is, for example, 3 mm, and the inside diameter of the thread passing hole 52 is, for example, 1.5 mm.

Next, the second driving means 38 shown in FIG. 3 will be described. Reference numeral 56 denotes a ventilation hole formed in the axial center portion of the first guide member 26, and 57 in FIG. 3 and 58 in FIG. 8 denote ventilation paths formed in the main member 25, respectively, and one end of the ventilation path 58 serves as an air receiving port 59. The opening is formed on the outer peripheral surface of the main body member 25 in the same manner as the receiving port 43 of the first driving means 37. Reference numeral 60 in FIG. 3 denotes a discharge port at the lower end of the ventilation hole 56. The inner diameter of the discharge port 60 is, for example, 1.5 mm, and the outer diameter of the first guide member 26 at the discharge port 60 is 2.5 mm.
It is. Also, if an example of the dimensions of each part in the main body 22 is shown, D1 = 66 mm, D2 = 57 mm, D3 = 30 m
m, D4 = 5.5 mm, θ1 = 20 °, θ2 = 40 °,
L1 = 50 mm and L2 = 58 mm.

Next, FIG. 6 showing the operation body 23 in detail will be described. Reference numeral 121 denotes an annular base frame, which is formed by stacking three elements of a first element 122, a second element 123, and a third element 124 in the axial direction, and these are integrally connected by connecting bolts (not shown). It has been turned. The first element 122 is formed of, for example, a synthetic resin material. First, the configuration provided in the element 122 will be described. Reference numeral 125 denotes an air supply path which is formed in an annular shape as shown in FIG. The supply path 12
5 has an air inlet 1 as shown in FIG.
26 is provided, to which one end of an air supply pipe 128 (for example, a hose) is connected via a connector 127. The other end of the air supply pipe 128 is connected to an air source 129, for example, a compressor as shown in FIG. 130 in FIG. 6 is an air supply port.
Are provided at positions corresponding to the receiving ports 43 and 59, respectively. Reference numeral 131 denotes a sealing member formed of an elastic material such as rubber. The sealing member 131 is in contact with the air supply port 130 at a portion around the receiving ports 43 and 59 in the main member 25 of the main body 22 to maintain airtightness. The airtight holding section 132 is provided with, for example, a bulging section as shown. A plurality of valves 133 are provided corresponding to the respective air supply ports 130. Reference numeral 134 denotes a valve seat of the valve. The outer peripheral side is an air receiving portion 140 of the valve, and the inner peripheral side is a discharge portion 139. Reference numeral 135 denotes a valve body, which is an adhesive member 1 attached to a hard material, for example, a base material 136 made of stainless steel.
37 (for example, a flexible rubber material) is attached.
138 is a spring for closing the valve. 141 and 142 are discharge units 133
Are connected to the air supply port 130, and their diameters are, for example, 0.5 mm and 2.5 mm. 143 is air vent 1
A lid for closing the opening of the first element 122 generated for forming the 41 and 142, and is hermetically bonded to the first element 122.

Next, the second element 123 is formed of a synthetic resin material and has a concave cross section. Reference numeral 146 denotes an electromagnet provided in the second element 123 for operating the valve 133, and is provided corresponding to each valve. The electromagnet 146 has a well-known configuration. 147 is a fixed iron core, 148 and 149 are yokes, both of which are formed in a disk shape. 150 is a cylindrical yoke. 151 is a coil, 152 is its bobbin, 153
Denotes windings. Reference numeral 154 denotes a plunger in which the base material 136 of the valve body 135 is integrally formed. Next, a filler 155 is filled so as to fill the space between the inner surface of the second element 123 and the many electromagnets 146. As the filler 155, for example, a casting resin is used. 156 indicates a number of lead wires embedded in the filler 155, one end of which is the winding of each coil.
At 153, the other end is the air inlet for the second element 123.
It is connected to a connector (not shown) attached to the outer wall on the same side as 126. Next, reference numeral 157 denotes a packing for preventing air from leaking from the air supply path 125.
5 (see (C) of FIG. 6),
At a position corresponding to each electromagnet 146, a through hole 157a for penetrating the plunger is formed. 158 is an annular gasket interposed between the yoke 149 and the bobbin 152 in each electromagnet 146,
Reference numeral 159 denotes an O-ring interposed between the fixed iron core 147 and the bobbin 152, all of which are for preventing air leakage from a space communicating with the air supply path 125. The third element 124 is made of, for example, aluminum. The outer diameter of the operating body 23 having the above-described configuration is, for example, 95 mm.

A first driving means 37 and a second driving means 38 in the main body 22, a valve 133 in the operating body 23,
The relationship with the air source 129 is as shown in FIG. The valves corresponding to the first driving means 37 are denoted by reference numerals 133a, 133b, 13
The valves corresponding to the second driving means 38 are denoted by reference numerals 3c.
Shown at 133A.

Next, the preparation state returning device 11 of FIG. 2 will be described. The device is constituted by a pull-back device 70 individually provided in each yarn supply path from the plurality of yarn supply sources 9 to the selection device 10. Each retraction device 70 is mounted, for example, on a support frame 1a fixedly disposed above the base frame 1. 10 to 12 showing the retraction device 70 in detail will be described below. Reference numeral 71 denotes a base, which is attached to the support frame 1a. Reference numeral 72 denotes a winding drum fixed to the base 71, and a plurality of grooves 73 in the axial direction are formed on the outer peripheral surface. This groove 73
Is formed, the yarn contact surface 74 on the outer circumference of the winding drum 72 is formed.
Has a small area, and the sliding of the yarn with respect to the drum 72 is good. Next, reference numeral 75 denotes a yarn winding mechanism around the drum 72. Reference numeral 76 denotes a motor in the mechanism, which is fixed to the base 71. Reference numeral 76a indicates the rotation axis. As the motor 76, for example, a motor capable of controlling the rotation angle such as a pulse motor is used. Reference numeral 77 denotes a wrapping member, which is attached to the rotating shaft 76a using a bracket 78. The winding member 77 is formed in a cylindrical shape as shown in the drawing, and has a guide portion 77a that rotates around the winding drum 72 at one end and a guide portion 77b that is located at the rotation center at the other end. . Reference numeral 79 denotes a thread guide attached to the base 71, and a through hole 79a for thread insertion is located on an extension of the rotation center of the rotation shaft 76a. Reference numeral 80 denotes a thread holder attached to the base 71, which is configured to pinch the thread and stop its movement, or release the pinching to freely move the thread as is well known. In FIG. 2, reference numeral 81 denotes a known thread guide.

In the present embodiment, the tensioning device 13 is constructed by using a yarn adjusting device 83 provided in each yarn supply path from each retraction device 70 to the selection device 10 as shown in FIG. It is. The yarn adjusting device 83 is a known device (for example, see Japanese Patent Publication No. 58-10115) that is configured using an electromagnet so that a predetermined tension can be applied to the yarn or the tension can be released. Reference numeral 84 denotes a known thread guide.

Next, the yarn passing device 14 and the yarn passing device 15 shown in FIGS. 1 and 2 are all known devices using, for example, air (for example, Japanese Patent Publication No. 57-31916 or Japanese Patent Application Laid-Open No.
652).

Next, the operation of the sewing machine having the above configuration will be described.
First, as a preparatory work, the bobbin stand 19 in each yarn supply source 9 is prepared.
The bobbin 21 around which the yarn 20 is wound is mounted on the bobbin, and the yarn 20 pulled out from each of the bobbins 21 is supplied to the selecting device 10 through a yarn guide 81, a retraction device 70, a yarn adjusting device 83, and yarn guides 84 and 61. in this case,
In the retraction device 70, as shown in FIG. 10, the thread 20 is inserted through the thread holder 80 into the winding member 77 in the state shown in the drawing, and further into the through hole 79a of the thread guide 79.
In the selection device 10, the thread 20 is inserted from the introduction port 33 as shown in FIG.

In this state, the operation of each device is performed as follows based on a predetermined program under the control of a computer or other control device. First, in the retraction device 70 relating to the thread to be used for sewing, the thread holder 80 is released, and also in the thread adjusting device 83 relating to the thread, the application of tension is released, and the thread is in a free state.
In this state, the valve 133A of FIG. 9 and a valve, for example, 133a related to the first driving means 37 corresponding to the above-mentioned thread are opened. The opening of these valves is performed by exciting the electromagnet 146 connected to each valve. That is, when the electromagnet 146 is excited, the valve body 135 separates from the valve seat 134 as shown in FIG. The air that has passed through the valve 133A flows into the ventilation path 58 in FIGS. 8 and 9 of the second driving means 38 from its receiving port 59, passes through the ventilation path 57 and the ventilation hole 56 in FIG. It is blown out vigorously toward 34. The air passing through the valve 133a flows into the annular ventilation passage 46 from the receiving port 43 in FIG. 5 of the first driving means 37, flows straight downward through the groove 47a of the guide portion 47, and further has a narrow ventilation passage 50. The air is blown straight out of the air outlet 51 toward the holding portion 35 through the air outlet. Due to the flow of air by the first driving means 37, the lower end of the yarn 20 in the holding portion 35 is
3 to the guideway 36 in FIG. 3, and reaches the narrow portion indicated by reference numeral 36a at the lower portion of the guideway 36. In the narrow width portion 36a, the air flowing from the narrow width portion 36a to the outlet 34 is generated by the air blown out from the discharge port 60 of the second driving means 38, so that the above-described yarn reaching the narrow width portion 36a is formed. Is flowed to the outlet 34 by the flow of the air, and is further fed downward therefrom. When the thread to be used for sewing is sent out from the outlet 34 in this way, the valves 133A and 133a are closed and the flow of air is stopped. The time from the start to the stop of the flow of the air is, for example, about 0.2 to 0.5 seconds (1 second is also possible). The air pressure is, for example, 2-4 kg /
It is cm ^2.

When threading is performed as described above, threading from the holding portion 35 to the outlet 34 is reliable for the following reason. That is, the valve 133A is opened slightly earlier (for example, 0.1 second) than the valve 133a. Therefore, an air flow from the guideway 36 toward the outlet 34 is formed in advance, and
Air flows out of the holding portion 35 into 36. The guideway 36 is a large space. For this reason, when air is blown out from the holding portion 35 to the guide path 36, the pressure rise in the guide path 36 is small, and turbulence in the guide path 36 and around the first guide member 26 are generated. The swirling flow hardly occurs, and the air smoothly flows toward the outlet 34. Therefore, the yarn sent out from the holding portion 35 to the guide path 36 is surely directed to the outlet 34 without being entangled with the first guide member 26 and sent out therefrom.

The air blown out from the outlet 51 shown in FIG. 5A and the air blown out from the outlet 60 shown in FIG. 3 are air flowing straight, so that the yarn can be sent straight. Threading can be performed extremely smoothly. In addition, since the air flows as described above, the problem of twisting or untwisting the yarn can be prevented.

When air is sent to or stopped from the first and second driving means 37 and 38 by opening and closing the valve 133 as described above, each valve 133 is provided in the very vicinity of the driving means 37 and 38. Therefore, the effect of elastic expansion and contraction of air between the valve and the driving means is extremely small, and therefore, the first and second driving for controlling the opening and closing of the valve (for example, energizing and stopping the electromagnet). The response of the operation of the means is good. This enables high-speed operation of each driving means.

When the second driving means 38 is operated, the guide path is also provided in the holding portion 35 relating to a thread other than the thread used for sewing.
An air flow is generated toward the side 36. However, the flow rate is so small that the yarn cannot be advanced.

The yarn 20 sent out from the outlet 34 as described above is passed through the balance 12 by the threading device 14 shown in FIGS. 1 and 2, and further inserted into the needle hole of the needle 6 by the threading device 15.

When the thread used for sewing is passed through the needle 6 as described above, the thread adjusting device 83 relating to the thread enters a state in which tension is applied to the thread, and the turning of the main shaft of the sewing machine is performed as is well known. The movement is started, and the vertical movement of the needle 6 and the rotation of the shuttle are started. The balance 12 is operated in conjunction therewith, and the sewing on the cloth on the table is performed in the same manner as in a known sewing machine.

Next, the operation for changing the thread used for sewing to another thread is performed as follows. When the needle 6 reaches the top dead center, the rotation of the main shaft of the sewing machine is stopped, and the operation of the needle 6 and the shuttle stops. Below the needle plate, the upper thread is cut by a thread cutting device. Thereafter, the yarn holding device 80 of FIG. 10 relating to the yarn is operated to stop the movement of the yarn in the portion of the holding device 80, and the yarn adjusting device 83 of FIG.
Is released from the tension applied to the yarn. Next, the winding member 77 in FIG. 10 is rotated, and the guide portion 77a is
Rotate around 72. As a result, the yarn 20 is pulled back through the yarn guide 79 as shown in FIG.
Wrapped around. By this pullback of the thread, the thread that has passed through the needle hole of the needle 6 is pulled out from the needle hole, the balance 12 is further pulled out, and the thread is pulled back to the holding portion 35 of the selection device 10. When the retraction is completed, the motor 76 stops. The control of the pullback size is performed by controlling the rotation angle of the motor 76, and the pullback of the yarn 20 is performed by holding the lower end of the yarn 20 with the holding portion.
It ends when it reaches 35. After the thread is pulled back as described above, the threading of the thread to be used next is performed in the same manner as described above, and the sewing with the new thread 20 is performed in the same manner as described above.

Next, the operation for starting sewing again using a thread which has already been pulled back as described above is as follows. In this case, the yarn holder 80 in the retraction device 70
Is held, and the operation of the selection device 10 and the threading devices 14 and 15 is performed in a state where the rotation of the motor 76 is performed in a direction opposite to that at the time of the lifting. Accordingly, the guide portion 77a of the retraction device 70 rotates around the drum 72 to release the yarn wound around the drum 72, and the yarn passes through the yarn guide 79 and further passes through the tension device 13 to the selection device 10. And the thread passing operation as described above is performed. In this case, the rotation of the motor 76 is performed in the opposite direction by the same angle as the angle at which the winding is performed, and the yarn having the same length as the retracted length is supplied toward the needle 6. Thereafter, the holding portion 80 is released, and sewing is started in the same manner as in the case described above.

[0028]

As described above, according to the present invention, a plurality of yarns are driven by individual driving means 37, and air is supplied to each driving means 37 through individual valves 133. ing. Therefore, when sending out the selected yarn, the yarn can be sent out by sending air only to the driving unit 37 related to the selected yarn among the plurality of driving units 37. This has the effect of reducing the amount of air required for sending out the yarn, reducing the energy for supplying air, and contributing to energy saving.

Further, in the present invention, when sending out one selected yarn, an operation for sending out is performed, and then
There is an effect that the yarn can be quickly sent out in a short time. That is, in the present invention, the air supply path 125 for supplying air to the driving means 37 is provided so as to surround the casing 24 provided with the driving means 37. Therefore, the air supply path 125 has a feature that a relatively large volume can be secured. When the amount of air held in the air supply path 125 is large, high-speed air can be continuously sent to the one driving unit 37 from the moment the valve 133 is opened. Therefore, the yarn can be continuously driven at a high speed from the moment when the valve 133 is opened. As a result, the yarn can be sent out in an extremely short time from the operation of opening the valve 133. The fact that the thread can be sent out in a short time in this manner is effective in improving the efficiency in a sewing operation in which replacement of a plurality of threads and sewing with the replaced thread are repeated one after another.

Further, in the present invention, the plunger 1
54 are arranged so that the operation direction is parallel to the axial direction of the casing 24. Generally, the size of the electromagnet 146 in the operation direction of the plunger 154 is large, and the size in the direction perpendicular to the direction is small. In the present invention, such an electromagnet 146 is arranged in the above-described state, so that the diameter of the yarn selecting device is equal to the diameter of the casing 24 by the electromagnet 146.
The dimension on the smaller side of is added. That is, the diameter of the yarn selecting device can be minimized. The fact that the diameter of the yarn selecting device can be reduced as described above has an effect of meeting the demand for reducing the arrangement pitch of the sewing machine bed in a multi-head sewing machine. That is, in a multi-head sewing machine, there is a demand to reduce the arrangement pitch of the sewing machine bed so that as many patterns as possible can be sewn simultaneously within a certain range of the cloth. When the arrangement pitch of the sewing machine beds is reduced, there is a demand that the yarn selection device provided for each sewing machine bed also has a small arrangement pitch similarly to the sewing machine bed. According to the present invention, there is an effect that the diameter of the yarn selecting device can be reduced as described above. Therefore, the configuration of the sewing head can be extremely reduced.

[Brief description of the drawings]

FIG. 1 is a front view of one sewing machine in a multi-head sewing machine.

FIG. 2 is a side view of the same.

FIG. 3 is a partially cutaway enlarged view of the selection device.

4A is a sectional view taken along line 4A-4A in FIG.
(B) is a sectional view taken along line 4B-4B.

FIG. 5A is a longitudinal sectional view showing a first driving unit, and FIG.
FIG. 5 is a sectional view taken along line VV in FIG.

6A is an enlarged vertical cross-sectional view of the operating body, FIG. 6B is a partial view of the valve in an open state, and FIG. 6C is a perspective view of the packing (partial view).

7A is a sectional view taken along line VII-VII in FIG.
(B) is a cross-sectional view showing an air receiving port in the supply path.

FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 3;

FIG. 9 is a diagram showing a relationship between a driving unit, a valve, and an air source.

FIG. 10 is a partially cutaway side view of the retraction device.

FIG. 11 is a longitudinal sectional view of a winding drum.

FIG. 12 is a side view showing a state in which the yarn is wound around the winding drum.

[Explanation of symbols]

 2 Sewing machine 6 Needle 8 Thread supply device 9 Thread supply source 10 Selection device 12 Balance

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-53-123257 (JP, A) JP-A-51-30054 (JP, A) JP-A-51-42652 (JP, A) 89365 (JP, A) JP-A-50-84354 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) D05B 1/00-97/12

Claims (2)

(57) [Claims] 1. A selecting device for selecting one of a plurality of yarns supplied from a plurality of yarn supply sources 9 for supplying yarns.
Reference numeral 10 denotes a casing 24, a plurality of inlets 33 provided at one end of the casing 24 for introducing a yarn, and a plurality of inlets 33 provided at the other end of the casing 24.
In order to derive a single yarn selected from the yarns respectively located at the outlets 34, the outlets 34 communicate with the plurality of inlets 33 through the yarn passages 35 and 36, and are introduced into the respective inlets 33. A plurality of driving means 37 provided in the casing 24 for sending the yarns to the outlet 34 by individual air flows, respectively.
An annular air supply path 125 for distributing air to driving means 37 provided to surround the periphery of the casing 24;
A plurality of valves 133 provided for individually opening and closing the passages with respect to a passage from each of the driving means 37 to the driving means 37, and a plurality of valves 133 provided around the casing 24.
A plurality of electromagnets 146 for individually controlling the yarn selection devices 3. 2. The yarn selecting device according to claim 1, wherein the electromagnets 146 are arranged such that the operation direction of each plunger 154 is parallel to the axial direction of the casing 24.