JPH06254277A - Multi-color sewing machine - Google Patents

Abstract

PURPOSE:To eliminate a thread pull-up work from a needle or thread take-up lever by a hand work by a method wherein a pull-back device is individually provided to thread passages for respective color threads from a plurality of color thread feeding sources, and a color thread is pulled up from a needle or thread take-up lever by winding the color thread on the side connected to the thread take-up lever around the outer peripheral surface of a drum by a thread guide part which turns around the drum. CONSTITUTION:A pull-back device 11 is individually provided on the passages of respective threads between a plurality of color thread feeding sources 9 and a thread take-up lever 8, and a thread 20 which is pulled out from a bobbin 21 being fitted in a bobbin stand 19 of each color thread feeding source 9 is brought to a selecting device 10 through a thread guide 81, pull-back device 11, tension device 12, and thread guides 84, 61. When a sewing by one color thread is completed, and the color thread is required to be pulled up from a needle 6 or the thread take-up lever 8 in order to sew using another color thread, by applying an operation signal to a driving device 74, a winding member 69 turns, and the color thread 20 is wound on the outer peripheral surface of a drum 64 orderly, and the color thread 20 is pulled up from the needle 6 or thread take-up lever 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-color sewing machine which performs sewing by selectively using color yarns supplied from a plurality of color yarn supply sources.

[0002]

2. Description of the Related Art A multicolor sewing machine comprises a bed, a shuttle provided below the bed, a needle for sewing provided above the bed, a balance above the needle, and sewing above the needle. A plurality of colored yarn supply sources for supplying colored yarns for use, and selectively draws the colored yarns from the plurality of colored yarn supply sources, and guides the colored yarns to the needle through the balance. Sew. When sewing with one colored thread is completed and then sewing with another colored thread is performed, the colored thread that has passed through the balance or the needle after the previous colored thread is separated from the cloth Is manually pulled by a worker from a location above the balance and pulled up from the needle or the balance, and the pulled-up colored thread is wound in a small size and kept in a place where it does not interfere with sewing with other colored threads. Then, the colored thread used for sewing next is passed through the balance and the needle.

[0003]

The process which is premised on the fact that the above-mentioned work of pulling up the colored yarn from the needle or the balance is carried out manually by the above-mentioned worker has a problem that is not suitable for the automation of the sewing work by the sewing machine. is there.

The present invention has been made in order to solve the above-mentioned problems (technical problems) of the prior art, and it is possible to eliminate the work of manually pulling a thread from a needle or a balance by an operator. The purpose of the present invention is to provide a multi-color sewing machine that can be adapted to the automation of sewing work.

[0005]

In order to achieve the above object, a multicolor sewing machine according to the present invention is provided with a bed, a shuttle provided below the bed, and a sewing machine provided above the bed. A needle, a balance, and a plurality of colored yarn supply sources for supplying colored yarns for sewing, respectively, the colored yarns are selectively drawn out from the plurality of colored yarn supply sources, and the colored yarns are fed to the balance. In a multi-color sewing machine that guides the needle through the needle to perform sewing, the drum and the outer peripheral surface of the drum with respect to the passage of each color thread between the plurality of color thread supply sources and the balance. On the other hand, it is provided with a winding member in which a yarn guide portion is rotated around the drum in order to wind the colored yarn on the side connected to the balance, and a drive device for rotating the winding member. The pullback devices are individually provided.

[0006]

[Function] Pulling out desired color yarns from a plurality of color yarn supply sources,
By guiding it to the balance and the needle, sewing with the colored thread can be performed. After the sewing with the colored yarn is completed and the colored yarn is separated from the cloth, when the drive mechanism is operated by the operation signal, the yarn guide portion of the winding member rotates around the drum, and the colored yarn is sequentially wound on the drum and the needle And withdrawn from the balance.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 showing one of the multi-head multicolor sewing machines
In the above, 1 is a horizontally long base frame in a multi-head sewing machine, which is also called a bridge. Reference numeral 2 denotes one sewing machine provided in the bridge 1. 3 is a head in the sewing machine. A head frame 4 is attached to the base frame 1. Reference numerals 5, 6, 7 and 8 indicate the existence of a needle bar, a needle for sewing provided at the lower end of the needle bar, a cloth presser, and a balance in order, and these are well-known structures and, as is well known, ascending / descending not shown. It is moved up and down by the mechanism to exert a predetermined function. Next, a configuration for supplying colored yarn will be described. Reference numeral 9 denotes a colored yarn supply source, and a plurality of colored yarn supply sources are provided for supplying yarns of different colors and different thicknesses. Reference numeral 10 is a selection device for selecting and sending out the color yarns supplied from the respective color yarn supply sources 9. Reference numeral 11 is a pullback device for bringing the respective colored yarns to the selection device 10 in a ready state, and 12 is a tension device for applying a predetermined tension to the colored yarns. Next, 14 is a threading device for threading from the selecting device 10 to the thread balance 8, and 15 is a threading device for threading from the thread balance 8 to the needle 6. 16 indicates the presence of a well-known bed in the sewing machine, the figure showing the upper surface of the bed. The bed is provided with a needle plate as is well known, and a well-known shuttle is provided below it. A known cutting device for the upper thread and the lower thread is provided between the needle plate and the shuttle.

Next, the color yarn supply source 9 will be described.
18 is a pedestal, 19 is a bobbin stand attached to the pedestal 18, 20 is a colored thread for sewing (upper thread, and is also referred to as thread below)
An example is shown in which the bobbin is wound around 21 and is set up 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 around the main body 22. In FIG. 3, reference numeral 24 denotes a casing of the main body, which is a substantially columnar main body member 25 having a built-in structure for selecting a thread, a cone-shaped first guide member 26 for forming a thread guide path, and a cap. 2nd guide member 27 in the shape of a circle. 26
Reference numeral a is a screw connecting portion, 25a and 27a are flanges for connecting the main member 25 and the second guide member 27, and 28 is a packing for preventing air leakage. The outer peripheral side surface of the first guide member 26 and the second guide member 27.
All of the inner peripheral side surfaces are smooth so that the threads can slide smoothly. Next, 33 is a thread introduction port, and a large number (for example, 16) are arranged on one circumference around the axis of the main member 25. Reference numeral 34 denotes a yarn outlet, and reference numeral 35 denotes a holding portion for holding the tip of the yarn introduced from the inlet 33, which is formed into a small through hole communicating with each inlet 33. Reference numeral 36 in FIG. 3 is a guide path connecting the holding portion 35 and the outlet 34. Reference numeral 61 in FIGS. 1 and 2 is a thread guide for guiding the thread toward the introduction port 33.

In FIG. 3, the yarn is guided from the holding portion 35 to the outlet port 34.
The drive means for feeding through will be described. The driving means includes a plurality of first driving means 37 individually provided for each holding portion 35 in order to feed the yarns in each holding portion 35 to the middle of the guide passage 36, and the first driving means 37 to the middle of the guide passage 36. It comprises a second driving means 38 for sending the picked-up yarn from there to the outlet 34, and for sending it out from the outlet 34. FIG. 5 showing the first driving means 37 in detail will be described. 41 and 42 are members for strongly blowing air toward the holding portion 35 for driving the yarn,
A nozzle hole and a nozzle member are shown respectively. 42a is a screw part for mounting. 43 is an air inlet. 46 is an annular air passage for sending air evenly around the nozzle member 42, 47
Is an air guide portion for flowing air straight downwards in parallel with the axis of the nozzle hole 41, and has a large number of grooves 47 in a direction parallel to the axis of the nozzle member 42 in a sectional shape as shown in FIG. 5B.
A large number of a are formed around the nozzle member 42. Reference numerals 48 and 49 denote portions for forming a narrow tubular cylindrical air passage 50 having a straight shape in the axial direction, and respectively show a lower thin portion of the nozzle member 42 and a lower thin portion of the nozzle hole 41. Show.
Reference numeral 51 denotes an outlet at the lower end of the ventilation path 50. 52 is the inlet
A threading hole for passing a thread from 33 to the holding portion 35. The outer diameter of the small diameter portion 48 is, for example, 2.2 mm, the inner diameter of the small diameter portion 49 is, for example, 3 mm, and the inner diameter of the threading 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 small-diameter vent hole for sending air to the outlet 34 vigorously, and 60 denotes a discharge port. Reference numeral 57 in FIG. 3 and reference numeral 58 in FIG. 8 are ventilation passages for sending air from the air receiving port 59 opening to the outer peripheral surface of the main body member 25 in FIG. 8 to the ventilation hole 56. Above discharge port
The inner diameter of 60 is, for example, 1.5 mm, and the outer diameter of the first guide member 26 at the portion of the discharge port 60 is 2.5 mm. Main body 22 above
An example of the dimensions of the other parts in is D1 = 66 mm, D
2 = 57 mm, D3 = 30 mm, D4 = 5.5 mm, θ
1 = 20 °, θ2 = 40 °, L1 = 50 mm, L2 = 5
It is 8 mm.

Next, FIG. 6 showing the operating body 23 in detail will be described. Reference numeral 121 denotes an annular base frame, which is configured by stacking the first element 122, the second element 123, and the third element 124 in the axial direction, and is connected and integrated by a connecting bolt (not shown). The first element 122 is made of, for example, a synthetic resin, and the element 122
The configuration provided in the above will be described. Reference numeral 125 is an air supply passage formed in an annular shape as shown in FIG. 7A for distributing air, and an air inlet 126 is provided in a part of the air supply passage as shown in FIG. 7B. , One end of an air supply pipe 128 (for example, a hose) is connected thereto via a connector 127. The other end of the air supply pipe 128 is connected to an air source 129 such as a compressor as shown in FIG. 6, 130 is an air supply port to each of the receiving ports 43 and 59, 131 is a seal member for keeping the air supply port 130 airtight, and is formed of an elastic material such as rubber, and Entrance 43, 59
The bulging portion 132 is provided in pressure contact with the peripheral portion of the. 133 is a valve for turning on and off air to each air supply port. Reference numeral 134 denotes a valve seat of the valve, the outer peripheral side of which serves as an air receiving portion 140 of the valve and the inner peripheral side thereof serves as a discharge portion 139. Reference numeral 135 denotes a valve body, which is formed by attaching a contact member 137 (for example, a flexible rubber material) to a base material 136 made of a hard material such as stainless steel. 138 is a spring for closing the valve. 1
41 and 142 are air supply holes for connecting the discharge part 133 to the air supply port 130, and their diameters are 0.5 mm and 2.5 mm, for example. Reference numeral 143 denotes the first element 12 generated due to the formation of the air supply holes 141 and 142.
A lid for closing the second opening, which is airtightly bonded to the first element 122.

Next, the second element 123 is made of synthetic resin and has a concave cross section for accommodating the electromagnet. 146 is an electromagnet for operating each valve 133, which has a well-known configuration, and 147 is a fixed iron core,
Reference numerals 48 and 149 each denote a disk-shaped yoke, 150 denotes a cylindrical yoke, 151 denotes a coil, 152 denotes the bobbin, and 153 denotes a winding. A plunger 154 is formed integrally with the base material 136 of the valve body 135. Next, 155 is a filling material for filling the space between the inner surface of the second element 123 and the large number of electromagnets 146, and for example, casting resin is used. Reference numeral 156 denotes a large number of lead wires embedded in a filling material 155, one end of which is the winding 153 of each coil and the other end of which is the outer side of the second element 123 on the same side as the air inlet 126. It is connected to a connector (not shown) mounted on the wall. Next, 157 is a packing for preventing air from leaking from the air supply passage 125.
It is formed in an annular shape (see FIG. 6C) along 125, and a through hole 157a for penetrating the plunger is formed at a position corresponding to each electromagnet 146. 158 and 159 are air supply paths 12
A member for preventing air leakage from the space communicating with 5, which is an annular gasket and an O-ring, respectively. The third element 124 is for holding the electromagnet 146 in the second element 123 and is made of aluminum, for example. The operation body 23 having the above configuration
The outer diameter of is, for example, 95 mm.

A first drive means 37 and a second drive 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 respective first driving means 37 are designated by reference numerals 133a, 133b, 13
3c ... ・, the valve corresponding to the second drive means 38 is a reference numeral
Shown at 133A.

Next, the pull-back device 11 of FIG. 2 is provided with each color yarn supply source 9 and the selection device so as to be individually provided in the passage path of each yarn between the plurality of color yarn supply sources 9 and the balance 8. They are individually provided in the thread passages between the yarns 10 and 10, and are attached to, for example, a support frame 1a fixedly arranged above the base frame 1. The drawing device 11 will be described in detail below with reference to FIGS. Reference numeral 63 denotes a base, which is made of a synthetic resin material and is formed in a concave shape. 63a is a recess for drum fitting, 63b is a bottom wall,
Reference numeral 63c indicates a peripheral side wall, and 63d indicates a groove for mounting an arm provided on the back surface of the bottom wall. 64 is a drum, which is made of a synthetic resin material. 64a indicates the outer peripheral surface of the main body for winding the thread,
The middle part in the axial direction is formed with a small diameter to stabilize the wound yarn, and both end parts 65 and 66 are cross-sectional shapes for guiding the middle part when the yarn is wound around those parts. Is an arc-shaped guide slope. The guide slopes 65 and 66 are formed as smooth surfaces so that the thread slides well. Reference numeral 64b is a base portion for connection, which is press-fitted into the recess 63a of the base 63. 67 is a receiving member for stably supporting a winding member 69, which will be described later, and a drum 64.
It is formed in a disk shape that closes one end of. Next, 68 is a through hole for guiding the yarn from the colored yarn supply source toward the outer peripheral side of the drum, 68a is its yarn inlet, 68b is the yarn outlet, and each has a wear-resistant yarn guide. It is set up.

Next, 69 is a winding member, which is made of a synthetic resin material and is rotatably arranged around the shaft center of the drum 64. Reference numeral 70 denotes a base plate portion of the winding member 69, which is formed into a large-diameter disk shape in order to rotate the winding member 69 stably without rattling, and is opposed to the receiving member 67, and a thrust washer is provided therebetween. 73 is interposed. Reference numeral 71 denotes a thread guide portion, which is formed in a through hole shape, and has guide members 71a and 72a made of a hard material having high wear resistance, for example, alumina, at both ends thereof.
The end 72 on the drum 64 side of the yarn guide portion 71 is located on the outer peripheral side of the guide slope 66. Reference numeral 74 is a motor for rotating the winding member 69. A pulse motor, for example, is used to accurately control the rotation angle of the winding member 69, and is attached to the receiving member 67 with a set screw 74a. The boss 70 in the base plate portion 70 of the winding member 69 via the mounting sleeve 76 on the rotating shaft 75.
a is attached. The lead wire 74b of the motor 74 is the bottom wall 63b.
It is connected to a control device (not shown) through a through hole provided in the. Next, 77 is an arm that supports the thread guide 78, and a rod-shaped mounting piece 77a of the base portion is fitted into the groove 63d and fixed to the base 63 with a set screw 77b. The thread guide 78 is a winding member so that the tension of the thread is constant when the winding member 69 is rotated.
It is located on the central axis of rotation of 69. The thread guide 78 is made of a material having high wear resistance, such as alumina.

Next, 90 is a thread stopping mechanism provided on the peripheral side wall 63c of the base 63 for stopping the progress of the thread. 91 is a hole for thread insertion in the mechanism, 92 is a receiving part on the side wall of the hole 91, 93 is a pressing body for pressing the thread against the receiving part 92, and the receiving part 92 is formed by a guide 93a integrally formed with the receiving part 92. It is supported to move forward and backward freely. Reference numeral 94 is a spring for applying a biasing force to the receiving portion 92 to the pressing body 93. Reference numeral 95 denotes a release member for releasing the operation of the thread stopping mechanism 90, and a solenoid is exemplified, and the pressing body 93 is integrally connected to the tip of a plunger 96 thereof. solenoid
The lead wire 95b of 95 is connected to a control device (not shown) like the lead wire 74b. Next, reference numeral 98 is a mounting member for mounting the retracting device 11 to the support frame 1a, which has a mounting screw hole 99 and is formed integrally with the base portion 77a of the arm 77. Is used to integrate with the base 63.

In the present embodiment, the tension device 12 is arranged in the yarn passing path between each pulling device 11 and the selecting device 10 as shown in FIG. This tension device
Reference numeral 12 is a known one (for example, see Japanese Examined Patent Publication No. 58-10115) that is configured by using an electromagnet so that tension can be applied to and released from the yarn. Reference numeral 84 is a thread guide.

Next, the threading device 14 and the threading device 15 shown in FIGS. 1 and 2 are both known devices using, for example, air (for example, JP-B-57-31916 or JP-A-51-42).
652).

Next, the operation of the sewing machine having the above structure will be described.
First, as a preparatory work, bobbins are set up in each color yarn supply source 9.
The bobbin 21 having the thread 20 wound thereon is attached to the thread 19, and the thread 20 pulled out from each of them is guided by the thread guide 81, the pullback device 11, the tension device 1
2. Bring to the selection device 10 through the thread guides 84, 61. In this case, in the pullback device 11, the yarn guide portion 71 faces the through hole 68 as shown in FIG. 10, and the yarn 20 is inserted as shown by the chain double-dashed line. In the selection device 10, as shown in FIG. 3, the tip of the yarn 20 is inserted from the introduction port 33 and reaches the holding portion 35.

In this state, the operation of each device is performed as follows based on a predetermined program under the control of the computer and other control devices. First, in the pullback device 11 relating to the thread to be used for sewing, the solenoid
95 is energized, and the thread stopping mechanism 90 is released as shown in FIGS. 10 and 11 (A). The tension is also released in the tension device 12 related to the yarn, and the yarn becomes free. In this state, the valve 133A of FIG. 9 and the first driving means 37 corresponding to the above-mentioned yarn
The valve for example 133a is opened. The opening of these valves is performed by exciting the electromagnet 146 linked to each valve. That is, when the electromagnet 146 is excited, the valve body 135 separates from the valve seat 134 and the valve opens, as shown in FIG. The air that has passed through the valve 133A flows into the ventilation passage 58 of FIG. 8 and FIG. 9 in the second drive means 38 from its inlet 59, passes through the ventilation passage 57 and ventilation hole 56 of FIG. It is blown out vigorously toward 34. Valve 133a
The air that has passed through is the inlet of the first drive means 37 shown in FIG.
The air flows from 43 into the annular air passage 46, flows straight downward through the groove 47a of the guide portion 47, and then is blown out straight from the air outlet 51 toward the holding portion 35 through the narrow air passage 50. It Due to the flow of air by the first drive means 37, the lower end of the yarn 20 in the holding portion 35 reaches from the holding portion 35 to the guide path 36 in FIG. 3, and the narrow portion indicated by the reference numeral 36a below the guide path 36. Up to. In the narrow portion 36a, the air blown from the discharge port 60 of the second drive means 38 allows the air to flow from the narrow portion 36a to the outlet 34, so that the yarn reaching the narrow portion 36a is formed. The air flows to the outlet 34 by the flow of the air, and is further discharged downward from there. 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 air flow is stopped. The time from the start of circulation of the air to the stop is, for example, about 0.2 to 0.5 seconds (1 second is also possible). The pressure of air is, for example, ² to 4 kg / cm ² .

When threading is performed as described above, threading from the holding portion 35 to the outlet 34 is reliable for the following reasons. That is, the valve 133A is opened slightly earlier (for example, 0.1 seconds) than the valve 133a. Therefore, the air flow from the guide path 36 to the outlet 34 is formed in advance, and
Air from the holding portion 35 flows out to the 36. The guideway 36 is a large space. Therefore, when air is blown from the holding portion 35 to the guide path 36, the pressure increase in the guide path 36 is small, and the turbulent flow in the guide path 36 and the surroundings around the first guide member 26 are generated. It is difficult for the swirling flow to occur, and the air smoothly goes to the outlet 34. Therefore, the yarn delivered from the holding portion 35 to the guide path 36 is reliably delivered to the outlet 34 without being entangled with the first guide member 26.

Since the air blown out from the air outlet 51 of FIG. 5A and the air blown out of the discharge outlet 60 of FIG. 3 are air that flows straight, the yarn can be fed straight, and as described above. This allows extremely smooth threading. Further, since the air flows as described above, the problem of twisting or untwisting the yarn can be prevented.

When the air is sent to or stopped from the first and second drive means 37, 38 by opening and closing the valve 133 as described above, each valve 133 is provided in the immediate vicinity of the drive means 37, 38. Therefore, the influence of the elastic expansion and contraction of air between the valve and the driving means is extremely small, and therefore the first and second drive for controlling the opening / 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 drive means.

When the second drive means 38 is operated, the guide path is also provided in the holding portion 35 for threads other than the thread used for sewing.
An air flow is generated toward the 36 side. However, the flow rate is too small to advance the yarn.

The yarn 20 sent out from the outlet 34 as described above is passed through the thread balance 8 by the yarn passing device 14 shown in FIGS. 1 and 2, and is further inserted into the needle hole of the needle 6 by the yarn passing device 15.

When the thread used for sewing is threaded up to the needle 6 as described above, the tension device 12 relating to the thread is in a state of applying tension to the thread, and as is well known, rotation of the sewing machine main shaft. Is started and the vertical movement of the needle 6 and the rotation of the shuttle are started. Further, the balance 8 is operated in conjunction with it, and the sewing of the cloth on the bed is performed in the same manner as a known sewing machine. In the retracting device 11, the yarn 20 is shown in FIG.
In the direction indicated by the double-dashed line in the direction of arrow 20a.

Next, the operation of changing the colored thread used for sewing to another colored thread is as follows. When the needle 6 reaches the top dead center, the rotation of the sewing machine main shaft is stopped and the operation of the needle 6 and the shuttle is stopped. Under the needle plate, the upper thread is cut by the thread cutting device. On the other hand, in the thread stopping mechanism 90 of FIG. 10, the energization of the solenoid 95 is stopped, the pressing body 93 is moved toward the receiving portion 92 by the spring 94, and as shown in FIG.
20 is sandwiched between the receiving portion 92 and the pressing body 93 to make it incapable of proceeding. Further, the tension device 12 shown in FIG. 2 releases the tension applied to the yarn. Next, the motor of the retractor 11
The 74 is rotated by being supplied with power for rotation as an operation signal,
The yarn guide portion 71 rotates around the drum 64. By the rotation, the yarn 20 on the side linked to the balance 8 is wound around the outer peripheral surface of the drum 64 through the yarn guide portion 71 while being pulled back through the yarn guide 78 in the arrow 20b direction. In this case, the yarn coming out of the mouth 72 with the rotation of the yarn guide portion 71 is
Due to the positional relationship between b and the mouth 72, the drum 64 is first wound around the outer peripheral surface of the intermediate portion of the drum 64. As the winding member 69 rotates, the position around which the yarn is wound approaches the side of the guide slope 66 located inside the rotation trajectory of the yarn guide 71. When the thread coming out of the mouth 72 comes to be wound around the guide slope 66, the mouth 72 becomes a drum.
As the yarn 20 moves in the circumferential direction of 64, the yarn 20 slides along the slope 66 toward the lower position side in the axial direction of the drum 64 as indicated by arrow 100 in FIG. Therefore, when the yarn is wound around the slope 66 a plurality of times, the yarn 20 is wound side by side (in the axial direction of the drum 64) in a single winding state as shown in FIG. 13, and the yarns overlap each other. There is no. By such winding, the thread that has passed through the needle hole of the needle 6 is pulled out from the needle hole, further pulled out from the balance 8, and the tip end is pulled back to a predetermined position, for example, the holding portion 35 in the selection device 10. When the pullback is completed, the motor 74 is stopped by the control signal from the controller. The control of the pullback dimension as described above is performed by controlling the rotation angle of the winding member 69 by controlling the number of pulses applied to the motor 74. After pulling back the thread as described above, threading of the thread to be used next is performed in the same manner as described above, and sewing with the new thread 20 is performed in the same manner as described above.

Next, the operation when the sewing is started again using the thread which has already been pulled back as described above is as follows. The motor 74 of the retracting device 11 receives the actuation signal and starts rotating in the opposite direction to the above case. Further, the operations of the selecting device 10 and the threading devices 14 and 15 are started. When the winding member 69 rotates in the opposite direction to the rotation of the motor 74 (the winding member 69 that rotates in this manner functions as an unwinding member), the drum 64 is wound as described above. The thread 20 that has been taken off is sequentially released from the side of the mouth 72, and the thread guide section
It is pulled out in the direction of arrow 20a through 71 and the thread guide 78.
In this case, when the winding member 69 is rotated in the opposite direction by the same number of rotations as in the case of the winding, the yarn 20 having the same size as the wound size can be fed out, and the tip of the yarn 6 is fed to the needle 6 It can be guided to a position passing through the needle hole of. Then, by energizing the solenoid 95, the pressing body 93 is returned to the state shown in FIGS. 10 and 11 (A), and the thread stopper is released. After that, the sewing as described above is restarted.

Next, the pullback device 11 can be used to apply tension to the thread when the thread is used for sewing. When the yarn guide portion 71 is positioned at a position indicated by reference numeral 71 'in FIG. 12 so that the yarn coming out from the yarn outlet 68 rubs the peripheral surface of the drum 64 and reaches the yarn guide portion 71, Tension can be applied by the sliding resistance with respect to the peripheral surface of the drum 64. The magnitude of the tension can be set to an arbitrary magnitude by changing the location of the thread guide hole 71 and changing the distance that the thread 20 rubs against the drum 64.

Next, FIGS. 14 to 16 show the above-mentioned known balance 8.
2 shows a balance device that can be used instead of. The balance device shown in these figures has already been disclosed in Japanese Patent Application No. 4-33975.
It has the structure described in the No. 2 application document. In the figure, 187 is a base whose rear surface is attached to the front surface of the head frame 4, and 188 is a bearing integral with the base 187. Reference numeral 189 denotes a rotor, which is provided with shafts 190 at axial center positions on one end face and the other end face in the axial direction, respectively, and is rotatably attached to the bearing 188 by the shaft 190. A threading hole 191 is provided in the rotor 189, and is formed in a state orthogonal to the axis of the rotor 189. Reference numeral 192 denotes a thread introduction port in the threading hole 191, and 193 denotes a discharge port, respectively, and an insulator 194 for wear prevention is provided on the periphery of these. 195,196 are base
Thread guides are attached to 187 using support pieces 195a and 196a, respectively, and both have a structure in which two thin rods are juxtaposed at a slight interval for threading. These thread guides 195,196
As is clear from FIG. 15 (A), the thread guides 195 and 196 are provided at positions directly opposite to the axial center of the rotor 189 so that threading through the thread guides 195 and 196 and the thread passing hole 191 is easy. Inlet 192 when 191 is in a vertical position
Faces the thread guide 195, and at the same time, the outlet 193
It is set to face 6. Reference numeral 197 denotes a motor attached to the base 187 for rotating the rotor 189 reciprocally at a predetermined speed at a predetermined angle, and the rotation axis thereof is the shaft.
It is connected to 190. As the motor 197, for example, a pulse motor whose rotation angle can be easily controlled is used.

Rotor of the balance device in the case of sewing
The rotation of 189 is as shown in FIG. 16, for example. After the thread 20 is inserted in the state as shown in FIG.
First, 189 is rotated by 180 ° and brought into the state shown in FIG. 16 where the rotation angle of the main shaft of the sewing machine is 0 °. In this state, the rotation of the sewing machine main shaft is started, but the rotation of the rotor 189 is not performed until the angle reaches 60 °. Spindle rotation angle is 60
If it exceeds 0 °, the rotor 189 moves in the direction of arrow X as the needle 6 descends.
The yarn is rotated in the direction, and the yarn is delivered toward the needle as in the known balance. The rotation in the arrow X direction is performed until the main shaft rotation angle reaches 300 °, for example. When the main spindle rotation angle exceeds 300 °, the rotor 189 is rotated in the direction of the arrow Y, and after the main spindle rotation angle 360 °, the main spindle rotation angle 60 °.
To the state of. In this process, the pulling force applied to the yarn by the shuttle causes the yarn 20 to guide the yarn 20 to the yarn guide 195, one peripheral surface of the rotor 189, the inlet 192, and the yarn passing hole 1 as shown in FIG.
91, outlet 193, the other peripheral surface of rotor 189, thread guide 196
Through the needle hole of the needle 6 toward the shuttle under the needle plate, or excess yarn is drawn in the direction of arrow Y in the rotor.
It is pulled up by the rotation of 189. The above operation is repeated to sew the cloth.

[0033]

As described above, according to the present invention, there is an effect that a desired colored yarn 20 can be selected from a plurality of colored yarns and sewn.

Moreover, when it is desired to pull up the previous color thread from the needle 6 or the balance 8 in order to finish sewing with one color thread and thereafter to sew with another color thread, an operation signal is sent to the drive device 74. When it is given, the winding member 69 rotates and the colored yarns 20 are sequentially drummed.
It has a feature that it is wound around the outer peripheral surface of 64 and can be pulled up from the needle 6 or the balance 8. This means that it is possible to eliminate the manual work of the worker for pulling up the colored yarn 20 from the balance 8 and the needle 6 as in the prior art, and it is possible to meet the demand for automating the sewing work. is there.

Further, in the present invention, when a part 66 of the outer peripheral surface of the drum 64 is formed as an inclined surface, the color threads 20 wound on the outer peripheral surface of the drum 64 overlap each other as described above. It has the feature that it is always wound in a single layer. This has the effect that when the color thread 20 is subsequently unwound from the drum 64 for use in sewing, it can be unwound very smoothly.

[Brief description of drawings]

FIG. 1 is a front view of a multicolor sewing machine.

FIG. 2 is a side view of the same.

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

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

FIG. 5A is a vertical cross-sectional view showing a first drive means, FIG.
Is a cross-sectional view taken along line V-V in (A).

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

7A is a sectional view taken along line VII-VII in FIG.
FIG. 6B is a cross-sectional view showing an air inlet in the supply path.

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

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

FIG. 10 is a vertical cross-sectional view of the pullback device.

11A and 11B are sectional views taken along line XI-XI in FIG. 1 for explaining the operation of the thread stopping mechanism.

FIG. 12 is a right side view of the pullback device.

FIG. 13 is an enlarged view of an essential part showing a winding state of colored yarn.

FIG. 14 is an enlarged front view of the balance device.

15A is a vertical cross-sectional view showing a state of the rotor during threading, and FIG. 15B is a vertical cross-sectional view showing a state where the rotor is rotated.

FIG. 16 is a time chart showing an example of the state of reciprocal rotation of the rotor with respect to the vertical movement of the needle.

[Explanation of symbols]

 6 needles 9 color yarn supply source 12 balance 64 drum 69 winding member 71 thread guide

Claims (2)

[Claims] 1. A bed, a hook arranged below the bed, a needle for sewing arranged above the bed, and a balance.
A plurality of colored yarn supply sources for supplying colored yarns for sewing respectively are provided, the colored yarns are selectively drawn from the plurality of colored yarn supply sources, and the colored yarns are guided to the needle through the balance. In a multi-color sewing machine that is configured to perform sewing, a drum and a side of the outer peripheral surface of the drum connected to the balance with respect to a passage of each color yarn between the plurality of color yarn supply sources and the balance. And a drive device for rotating the winding member, the winding member having a yarn guide portion rotating around the drum for winding the colored yarn, A multicolor sewing machine characterized by being prepared individually. 2. A portion of the outer peripheral surface of the drum, which is located on the inner side of the rotation trajectory of the yarn guide portion of the winding member, is a colored yarn wound around the outer peripheral surface of the drum as the yarn guide portion rotates. 2. The multi-color sewing machine according to claim 1, wherein the multi-color sewing machine is formed on an inclined surface so as to be sequentially moved in the axial direction of the drum.