Patent Grant
9290872
The present invention relates to a gas carrying threading device of sewing machine, particularly relates to the gas carrying threading device of sewing machine such as a serger, a double chain stitch sewing machine, or a interlock stitch sewing machine for performing a threading automatically to a looper by utilizing a pressurized gas.
Heretofore, in such as the serger, the double chain stitch sewing machine, or the interlock stitch sewing machine, the gas carrying threading device which is connected by a hollow looper thread guide which leads from a thread introduction portion which inserts the looper thread to a looper thread guide outlet of a loop-taker point of the looper and which feeds a looper thread by utilizing a flow of a pressurized gas which is supplied to the hollow looper thread guide is known.
By this gas carrying threading device, a complicated thread guard is unnecessary and a threading that a handleability is easy can be performed. Therefore, there are no mistake of the threading, no protrusion of the thread in mid-process, and no entanglement of the inserted looper thread with other thread, and thereby the threading can be performed at once by the extremely easy operation.
In a structure of such the gas carrying threading, a pathway for the threading becomes considerably simple, and an operation of the threading becomes easy, and an entanglement of the thread or an incidence of a thread breakage can be dissolved.
However, in the structure of such the gas carrying threading, while pressing a stopper shaft (positioning pin) for a stop positioning plate by one hand, a pulley is rotated manually by the other hand, and thereby a stitch forming device must be locked and concurrently a threading connecting device must be connected. Therefore, it is difficult to understand how to use this threading device for the operator who is not familiar with the sewing machine, and an insertion operation of the thread which is performed by using both hands concurrently is considerably complex, thereby the training of that purpose is necessary.
For this reason, the gas carrying threading device of sewing machine which generates the pressurized gas for carrying the looper thread by gas in the gas supply pump which operates by changing over the sewing machine motor which drives a stitch forming device and is able to perform the threading to the looper by one-touch operation is proposed (refer to Patent document No. 1).
[Patent document No. 1] JP-4741701-B2
However, in the structure of this gas carrying threading, in the operation of the gas supply of the gas supply pump, although the structure of this gas carrying threading is equipped with a clutch changeover limit mechanism to avoid the transition of a looper threading/stitch forming changeover mechanism from a looper threading state to a stitch forming state, this clutch changeover limit mechanism utilizes a pneumatic actuator (air damper) which supplies the gas from the gas supply pump. Therefore, first, in composition, because the number of parts increases, there is a problem that the structure is complicated. And second, in quality, there is a problem that it is troublesome to maintain accuracy for planning stabilization of the fit accuracy of the pneumatic actuator and the air leakage quantity of a retarder.
The present invention was conducted to solve these difficult points. The object of the present invention is to provide the gas carrying threading device of sewing machine that the pressurized gas to carry the looper thread by the gas is generated in the gas supply pump which operates by changing over the sewing machine motor which drives the stitch forming device, the threading to the looper is possible by one-touch operation, the looper threading/stitch forming changeover operation is performed by one hand safely and steadily, the structure is simplified and the quality is high.
In order to achieve such the object, a gas carrying threading device of sewing machine of the present invention is equipped with at least one looper having a hollow structure from a looper thread inlet to a looper loop-taker point thread outlet, a looper thread introduction mechanism inserting a looper thread which is led to the looper, a hollow looper thread guide extending from the looper thread introduction mechanism to the looper thread inlet and having a looper thread guide outlet, a gas supply pump that a looper threading of the looper thread is performed from the looper thread introduction mechanism to the looper thread guide outlet through the hollow looper thread guide by the gas carrying, a clutch for respectively transmitting power from the sewing machine motor to a drive shaft driving a stitch forming device including the looper at the time of the stitch formation or to the gas supply pump at the time of the looper threading, a looper threading/stitch forming changeover mechanism for changing over the clutch so that the transmission of the power to the stitch forming device is interrupted and the power is transmitted to the gas supply pump at the time of the looper threading and so that the power is transmitted to the stitch forming device and the transmission of the power to the gas supply pump is interrupted at the time of the stitch formation, and a changeover prohibition mechanism for prohibiting an abnormal changeover to a stitch forming state of the looper threading/stitch forming changeover mechanism during a gas supply operation of the gas supply pump.
Besides, in the gas carrying threading device of sewing machine of the present invention, a looper threading/stitch forming changeover manual operating portion of the looper threading/stitch forming changeover mechanism is hidden by a front cover of the sewing machine which can open and close freely, at the time of the looper threading, the front cover is opened and the looper threading/stitch forming changeover manual operating portion is changed over to the looper threading state, at the time of the stitch formation, after the looper threading/stitch forming changeover manual operating portion is changed over to the stitch forming state, the front cover is closed, thus the stitch forming device is operated.
Besides, in the gas carrying threading device of sewing machine of the present invention, the changeover prohibition mechanism is equipped with a front cover opening and closing detection piece which is attached pivotally at a sub-frame, detects the opening and closing of the front cover and is attached pivotally at an axis which is formed at a front face cover, a prohibition active arm which is attached pivotally at a prohibition active arm attaching pedestal which is fixed at the sub-frame by resisting elastic repulsion of a spring and is pivoted depending on a pivot of the front cover opening and closing detection piece, and a prohibition driven arm which is fixed at the looper threading/stitch forming changeover mechanism and prohibits an abnormal changeover to a stitch forming state of the looper threading/stitch forming changeover mechanism depending on a pivot of the prohibition active arm during the opening of the front cover, at the time of the looper threading, the front cover is opened, the front cover opening and closing detection piece releases a press of the prohibition active arm by a release of the press of a pressing end which is formed in an inner surface of the front cover, the prohibition active arm is pivoted by the spring, a tongue piece of the prohibition driven arm is latched together at a tip plane portion of the prohibition active arm, the looper threading/stitch forming changeover manual operating portion is changed over to the looper threading state, the stitch forming device is locked by rotating a pulley manually, simultaneously, a threading connecting device is operated, the prohibition driven arm is latched together at a side surface portion from the tip plane portion of the prohibition active arm, and the abnormal changeover to the stitch forming state of the looper threading/stitch forming changeover mechanism is prohibited, at the time of the stitch formation, after the looper threading/stitch forming changeover manual operating portion is changed over to the stitch forming state, the front cover is closed and the front cover opening and closing detection piece which is pivoted by the press of the pressing end which is formed at an inner surface of the front cover is pivoted, the prohibition active arm is pivoted, the prohibition driven arm is released from the side surface portion of the prohibition active arm onto the tip plane portion, the changeover to the stitch forming state of the looper threading/stitch forming changeover mechanism is activated, and the stitch forming device is operated.
Besides, in the gas carrying threading device of sewing machine of the present invention, the clutch is equipped with a pin clutch having a clutch slider which is moved to one of a pump drive member which transmits the power to the gas supply pump and a stitch forming drive member which is fixed to one end of the drive shaft and transmits the power to the stitch forming device so that approach/separation becomes free through a clutch changeover spring depending on a manual operation of a looper threading/stitch forming changeover manual operating portion and that the approach/separation state is held and the power from the sewing machine motor is transmitted.
Besides, in the gas carrying threading device of sewing machine of the present invention, the looper thread guide outlet and the looper thread inlet are equipped with a threading connecting device which is disposed so that approach/separation becomes free respectively at the time of the looper threading and at the time of the stitch formation depending on the manual operation of the looper threading/stitch forming changeover manual operating portion.
Besides, in the gas carrying threading device of sewing machine of the present invention, by rotating a pulley which is fixed at one end of the drive shaft manually, when the looper thread guide outlet and the looper thread inlet are aligned horizontally, a positioning device which connects the looper thread guide outlet of the hollow looper thread guide and the looper thread inlet of the looper is equipped.
Besides, in the gas carrying threading device of sewing machine of the present invention, in the looper threading/stitch forming changeover mechanism, at the time of the looper threading, the means which changes over the clutch so that the power is transmitted to the gas supply pump and the means which prepares the positioning of the positioning device which connects the looper thread guide outlet of the hollow looper thread guide and the looper thread inlet of the looper, prepares the connection of the threading connecting device which is disposed so that approach/separation becomes free respectively at the time of the looper threading and at the time of the stitch formation, operates the positioning device and interrupts the transmission of the power to the stitch forming device by rotating manually the pulley which is fixed at one end of said drive shaft, and operates the threading connecting device and connects the looper thread guide outlet and the looper thread inlet are included, at the time of the stitch formation, the means which changes over the clutch so that the power is transmitted to the stitch forming device and the means which releases the positioning of the positioning device, and releases the connection of the threading connecting device, and separates the looper thread guide outlet and the looper thread inlet are included.
Besides, in the gas carrying threading device of sewing machine of the present invention, the positioning device has a stop positioning plate, which is coaxially attached at the drive shaft and has a notch at the stop position of the circumferential direction for aligning horizontally the positions of the looper thread guide outlet, a thread take-up lever hole which is formed at a looper take-up lever and the looper thread inlet, and has a positioning pin, which is fitted to the notch by rotating the pulley manually at the time of the looper threading that the looper threading/stitch forming changeover manual operating portion is changed over to the looper threading side and operated manually.
According to the gas carrying threading device of sewing machine of the present invention, it is possible to accomplish the gas carrying threading operation that the pressurized gas to carry the looper thread by the gas is generated in the gas supply pump which operates by changing over the sewing machine motor which drives the stitch forming device, the threading to the looper is possible by one-touch operation, the looper threading/stitch forming changeover operation is performed by one hand safely and steadily, the structure is simplified and the quality is high.
Hereinafter, the preferable embodiment that the gas carrying threading device of sewing machine of the present invention is applied to the three-needle/six-thread serger (double chain stitch sewing machine) is explained in detail by referring to the drawings.
As shown in
The sewing machine motor M is attached to the sub-frame 2b, and a drive shaft 5 lengthens along the main frame 2 in a horizontal direction (
As shown in
The upper looper 7, the lower looper 8 and the looper 9 are respectively driven by the looper drive mechanism 10.
Although the needle drive mechanism 12, the cloth feed mechanism 4 and the looper drive mechanism 10 of the stitch forming device 30 are driven by the drive shaft 5, because the concrete structure and the motion are publicly known or well-known, the detailed explanation is omitted.
According to the three-needle/six-thread serger 1, an overlock stitch is formed on the cloth 25 by intersecting with the needle thread 17a, 17b which is inserted to the needle 11a, 11b, a lower looper thread 16b which is inserted to the lower looper 8 and an upper looper thread 16a which is inserted to the upper looper 7. In addition, the looper 9 forms a 401 type stitch (double chain stitch) on the cloth 25 by intersecting with a looper thread 16c which is inserted to the looper 9 and a needle thread 17c which is inserted to the needle 11c, and performs a so-called interlock stitch.
In this serger 1, when inserting each looper thread 16a, 16b, 16c to the upper looper 7, the lower looper 8 and the looper 9 through a thread tensioner 18 by the gas carrying, the upper looper 7, the lower looper 8 and the looper 9 are the hollow structures from looper thread inlet 7a, 8a, 9a to looper loop-taker point thread outlet 7b, 8b, 9b (
For this purpose, the serger 1 is equipped with the looper thread introduction mechanism 110 which inserts each looper thread which is led to the upper looper 7, the lower looper 8 and the looper 9, the hollow looper thread guide 7e, 8e, 9e which extends from the looper thread introduction mechanism 110 to the looper thread inlet 7a, 8a, 9a and has the looper thread guide outlet 7d, 8d, 9d and a gas supply source 40 that the looper threading of each looper thread is performed from the looper thread introduction mechanism 110 to the looper thread guide outlet 7d, 8d, 9d through the hollow looper thread guide 7e, 8e, 9e by the gas carrying (
As shown in
The looper thread inhalation area 114 and the looper thread introduction pipe 116 form a ventilation narrow area 114a which leads to the gas buffer area 115 and generates a jet stream in a downstream portion of the looper thread inhalation area 114.
A looper thread guide outlet end 114b of the looper thread inhalation area 114 is formed slantingly, thereby the generation of a vortex flow in the downstream side of the ventilation narrow area 114a is prevented.
A bottleneck portion 116c is formed in the inside of the looper thread introduction pipe 116 which is adjacent to the looper thread inhalation area 114 in the downstream side of the ventilation narrow area 114a, and therefore, the gas flow in the ventilation narrow area 114a is promoted by reducing the pressure of the downstream side of the bottleneck portion 116c and the looper thread is inhaled into the looper thread introduction pipe 116 by generating the negative pressure in the looper thread inhalation area 114, and the gas carrying can be performed to the looper loop-taker point thread outlet 7b, 8b, 9b of the upper looper 7, the lower looper 8 and the looper 9 through the hollow looper thread guide 7e, 8e, 9e.
As shown in
A threading switch 119b which operates by the push of the threading button 117 is provided on the looper thread introduction pedestal 112 and an attaching arm 118 together with an after-mentioned looper threading/stitch forming changeover switch 119a which operates by the operation of a looper threading/stitch forming changeover manual operating portion 91 of a looper threading/stitch forming changeover mechanism 90 (
As described below, the looper thread guide outlet 7d, 8d, 9d and the looper thread inlet 7a, 8a, 9a are disposed at the time of the looper threading and at the time of the sewing by the sewing machine so that contact/separation becomes free respectively.
In the serger 1, as described below, the looper threading and the sewing by sewing machine are performed by utilizing the upper looper 7, the lower looper 8 and the looper 9 which are the hollow structures from the above-mentioned looper thread inlet 7a, 8a, 9a to the looper loop-taker point thread outlet 7b, 8b, 9b, the looper thread introduction mechanism 110 which inserts the looper thread which is led to the upper looper 7, the lower looper 8 and the looper 9, and the hollow looper thread guide 7e, 8e, 9e which extends from the looper thread introduction mechanism 110 to the looper thread inlet 7a, 8a, 9a and has the looper thread guide outlet 7d, 8d, 9d.
As shown in
As shown in
When the transmission of the power to the gas supply pump 41 is interrupted by stretching and providing a pump drive spring 46 (
The piston 48 is attached at a piston shaft 48a and the piston cap 49 which is formed with the folding-fan shape toward the discharge direction and is the seal material is fixed at a piston head portion 48b.
The back flow stopper valve 51 is equipped with a spring 51b, a back flow stopper ball 51a which is pressed by the spring 51b, and a valve seat 51c which is screwed at a valve housing 50c and closes the valve by seating the back flow stopper ball 51a by pressing the spring 51b at the time of the return (inhalation) process and opens the valve by floating the back flow stopper ball 51a by the delivery pressurized air at the time of the pressurization (forward) process in the valve housing 50c which is connected to the pump cylinder 50 and a delivery port 50b.
In the operation of the gas supply pump 41, concerning the forward process of the piston 48, the piston cap 49 is connected to the inner wall surface of the pump cylinder 50 in the airtight state, and the air is compressed, and pressurized and injected as the compressed air from the delivery port 50b to an air inlet 112a (
As shown in
As discussed in detail, the clutch 60 is composed by so-called pin clutch, and a drive shaft pulley 21 that the power from the sewing machine motor M is transmitted by the timing belt MB, a drive shaft pulley boss 22, the pump drive (eccentric) cam 42, the pump drive member 61, the rotary drive member 23, the clutch slider 62 which houses a clutch connecting pin 63 inside coaxially and slidably, the stitch forming drive member 64 and a pulley 6 are provided in sequence on the shaft line of the drive shaft 5.
In the operation of the clutch 60 which is composed in this way, at the time of the looper threading, the clutch slider 62 slides to the pump drive member 61 side, and the clutch connecting pin 63 connects to a connecting pin hole 61a of the pump drive member 61 with the rotary drive member 23, and the gas supply pump 41 can be driven by a pump drive rod 43 by the pump drive (eccentric) cam 42 (
At the time of the stitch formation, the clutch slider 62 slides to the pulley 6 side, and the clutch connecting pin 63 connects to a connecting pin hole of the stitch forming drive member 64 with the rotary drive member 23, and the drive shaft 5 can be rotated (
In the serger 1, as shown in
The looper threading/stitch forming changeover manual operating portion (looper threading/stitch forming changeover manual lever) 91 is screwed up to a screw hole 92c by a screw so that the rotation is stopped in a rotary flatness portion 92b of one end portion of a changeover cam shaft 92 which is pivotally attached at the sub-frame 2a and a changeover cam shaft backup plate 93. The looper threading/stitch forming changeover cam 94 is fixed by fitting the pin 95 to the pin hole 92a of the changeover cam shaft 92.
The clutch changeover lever 69 is pivotally attached by a clutch changeover lever shaft 68 astride a clutch changeover lever attaching arm 71a of a clutch changeover lever supporting pedestal 71. The clutch changeover spring 67 is stretched between a clutch changeover lever spring stud 69c of the clutch changeover lever 69 and a clutch changeover arm spring stud 65c of the clutch changeover arm 65.
The clutch changeover pin 65a which changes over the clutch 60 is implanted to the clutch changeover arm 65.
The clutch changeover lever supporting pedestal 71 is fixed to one end of the clutch changeover pedestal 73 which is fastened at the main frame 2.
In the clutch changeover arm 65, the clutch changeover arm attaching hole 65b is pivotally attached at a clutch changeover arm attaching hole 73b of a clutch changeover arm supporting pedestal 73a of the clutch changeover pedestal 73 by a clutch changeover lever shaft 66. A through-hole 73c which allows the swing of the clutch changeover pin 65a depending on the swing of the clutch changeover arm 65 and moves the clutch changeover pin 65a freely is holed and provided at the clutch changeover pedestal 73.
Here, when rotating the looper threading/stitch forming changeover manual operating portion (looper threading/stitch forming changeover manual lever) 91 in a clockwise direction B (looper threading side), the clutch changeover lever 69 is driven by the clutch changeover link 72 and rotates in a counterclockwise direction, and the clutch changeover arm 65 is elastically repelled (stretched) by the clutch changeover spring 67, and one stable state is held by rotating in a clockwise direction. Therefore, the clutch changeover pin 65a fits to the slider control groove 62c, and the clutch slider 62 slides to the pump drive member 61 side, and the clutch connecting pin 63 connects to the connecting pin hole 61a of the pump drive member 61 by sliding a drive groove 23a of the rotary drive member 23, and the gas supply pump 41 can be operated and the looper threading can be performed (
On the other hand, when rotating and returning the looper threading/stitch forming changeover manual operating portion (looper threading/stitch forming changeover manual lever) 91 in the counterclockwise direction A (stitch formation side), the clutch changeover lever 69 is driven by the clutch changeover link 72 and rotates in the clockwise direction, and the clutch changeover arm 65 is elastically repelled (stretched) by the clutch changeover spring 67, and the other stable state is held by rotating in the counterclockwise direction. The clutch changeover pin 65a fits to the slider control groove 62c by the clutch changeover spring 67 and the clutch slider 62 slides to the stitch forming drive member 64 side, and the clutch connecting pin 63 connects to a connecting pin hole 64a of the stitch forming drive member 64 by sliding a drive groove 23a of the rotary drive member 23, and the drive shaft 5 can be rotated and the stitch formation can be performed (
Besides, the looper threading/stitch forming changeover cam 94 has a pin advance/retreat cam 94d for advancing and retreating an after-mentioned positioning pin for a stop positioning plate 81 and connecting a threading connecting device 120 (
When repeating, as shown in
In the threading connecting device 120, looper thread guide connecting plate 121, 136, looper thread guide outlet support 131, 139 and looper thread take-up lever thread guide 133, 139b are provided. These are fastened at the sub-frame 2a.
The hollow looper thread guide 7e, 8e, 9e of a hollow looper thread guide 130 which extends from the looper thread introduction mechanism 110 (
In addition, connecting plate guide bar 132, 138 which support the looper thread guide connecting plate 121, 136 is provided.
A spring 134 is stretched and provided between a spring stud 121k of the looper thread guide connecting plate 121 and a spring stud 131c of the looper thread guide outlet support 131, and thereby because the looper threading/stitch forming changeover manual operating portion (looper threading/stitch forming changeover manual lever) 91 is rotated to the clockwise direction B (looper threading side), the releasing cam 94c releases looper thread pass separated state through a cam follower 121g of the looper thread guide connecting plate 121, and when connecting the threading connecting device 120, the hollow looper thread guide 7f, 8f, 9f is elastically repelled to the looper side, and the looper thread guide outlet 7d, 8d, 9d and the looper thread inlet 7a, 8a, 9a are connected in the thread pass.
Besides, as shown in
As shown in
The positioning device 80 is equipped with a follower pin 84 which has a follower pin end 84a which engages to the pin advance/retreat cam 94d of the looper threading/stitch forming changeover cam 94 and the positioning pin 82 that the follower pin 84 is fitted in through a follower pin spring 83. The follower pin 84 becomes slidable by a guide pin 85 through the follower pin spring 83 in the inside of an elongate hole 82b. A positioning pin back spring 86 is provided between the guide pin 85 and the sub-frame 2a in the positioning pin 82, and the positioning pin 82 is elastically repelled toward the looper threading/stitch forming changeover cam 94.
The positioning pin 82 pierces a positioning pin slide hole 2aa and extends toward the positioning plate 81. The follower pin 84 and the positioning pin 82 that this fits are fitted in a shaft hole 121a leading to an elongate hole 121b of the looper thread guide connecting plates 121 with the looper thread pass separated state.
Further, in the gas carrying threading device of sewing machine of the present invention, as shown in
In the gas carrying threading device of sewing machine of the present invention, the looper threading/stitch forming changeover manual operating portion (looper threading/stitch forming changeover manual lever) 91 of the looper threading/stitch forming changeover mechanism 90 is hidden by the front cover 161 (
In the gas carrying threading device of sewing machine of the present invention, the changeover prohibition mechanism 160 comprises a front cover opening and closing detection piece 162 which is attached pivotally at the lower end of a front surface cover 171 (
One end 162b of the front cover opening and closing detection piece 162 combines the actuator of the safety switch 163, and when the front cover 161 is closed, the front cover opening and closing detection piece 162 of the front cover 161 is pivoted to the counterclockwise direction by the press of the pressing end 161a in
The spring 169 is attached between a spring stud 164a of the prohibition active arm attaching pedestal 164 and a spring stud 168a of the prohibition active arm 168 and is repelled elastically so as to pivot the prohibition active arm 168 always to the counterclockwise direction in
The prohibition driven arm 170 is fixed at the looper threading/stitch forming changeover mechanism 90 and the clutch changeover arm 65 of the clutch changeover transmitter 70 by a screw 170c.
The front cover 161 is opened at the time of the looper threading by this changeover prohibition mechanism 160, the front cover opening and closing detection piece 162 pivots to the clockwise direction freely by the release of the press of the pressing end 161a which is formed in the inner surface of the front cover 161, the prohibition active arm 168 is pivoted to the counterclockwise direction by the elastic repulsion of the spring 169, a tongue piece 170a of the prohibition driven arm 170 is latched together at a tip plane portion 168b of the prohibition active arm 168, the looper threading/stitch forming changeover manual operating portion (looper threading/stitch forming changeover manual lever) 91 is changed over to the looper threading state (clockwise direction B), the stitch forming device 30 is locked by rotating the pulley 6 manually, simultaneously, the threading connecting device 120 (
On the other hand, at the time of the stitch formation, after the looper threading/stitch forming changeover manual operating portion (looper threading/stitch forming changeover manual lever) 91 is changed over to the stitch forming state (counterclockwise direction A), the front cover 161 is closed and the front cover opening and closing detection piece 162 is pivoted by the press of the pressing end 161a, a pressed protrusion 168d of the prohibition active arm 168 is pressed by a pressing protrusion 162a, the prohibition active arm 168 is pivoted to the clockwise direction by resisting the elastic repulsion of the spring 169, a driven piece 170a of the prohibition driven arm 170 is released from the side surface portion 168c of the prohibition active arm 168 onto the tip plane portion 168b and the changeover to the stitch forming state (counterclockwise direction A) of the looper threading/stitch forming changeover mechanism 90 is activated, and the stitch forming device 30 is operated.
Hereinafter, the operation of the gas carrying threading device of sewing machine which is composed in this way is explained in sequence in more detail.
In now, when performing the looper threading, the front cover 161 is opened, the front cover opening and closing detection piece 162 of the changeover prohibition mechanism 160 is pivoted from the state of pivoting to the counterclockwise direction in
The looper threading/stitch forming changeover manual operating portion (looper threading/stitch forming changeover manual lever) 91 of the looper threading/stitch forming changeover mechanism 90 is rotated to the clockwise direction B (looper threading side) (
This state is an after-mentioned preparation step for prohibiting the abnormal changeover to the stitch forming state of the looper threading/stitch forming changeover mechanism 90.
Simultaneously, a rotational angle of the looper threading/stitch forming changeover cam 94 in the clutch changeover transmitter 70 is inhibited by a lever right rotation stopper 94f, and the looper threading/stitch forming changeover cam 94 rotates around the changeover cam shaft 92 of a rotary axis and pushes the clutch changeover link 72 which is attached pivotally at the clutch changeover connecting arm 94b (
The clutch changeover lever 69 which is attached by the clutch changeover lever shaft 68 at a clutch changeover lever attaching hole 71b which is provided at the clutch changeover lever supporting arm 71a of a clutch changeover lever supporting pedestal 71 is swung to the counterclockwise direction by a pivot point of the swaging pin 69a by the push of the clutch changeover link 72.
The clutch changeover arm 65 which is attached at the clutch changeover arm attaching hole 73b which is provided at the clutch changeover arm supporting pedestal 73a of the clutch changeover pedestal 73 by the clutch changeover arm shaft 66 and the clutch changeover arm attaching hole 65b is swung to the clockwise direction through the clutch changeover spring 67. In this case, the clutch changeover pin 65a slides in the inside of the through-hole 73c which is provided at the clutch changeover arm supporting pedestal 73a and positions at a left end (
As a result, the clutch changeover pin 65a fits into the slider control groove 62c, the clutch slider 62 of the clutch 60 slides to the pump drive member 61 side, the transmission of the power to the stitch forming device 30 is interrupted, the clutch connecting pin 63 slides in the drive groove 23a of the rotary drive member 23 and becomes a connectable state in the connecting pin hole 61a of the pump drive member 61. The piston 48 of the gas supply pump 41 can be reciprocated by the pump drive rod 43 and the pump drive arm 44 by the pump drive (eccentric) cam 42 (
Concerning the clutch changeover pin 65a, by the clutch changeover spring 67, the clutch slider 62 slides and contacts to the pump drive member 61 side, the contact state is held, the gas supply pump 41 for the looper threading can be driven, and the pump drive preparing state is achieved. That is, the clutch 60 holds one clutch stable state by the elasticity of the clutch changeover spring 67.
In this case, the clutch 60 is the pin clutch, and because the clutch connecting pin 63 is fitted easily to the connecting pin hole 61a of the pump drive member 61 through the rotary drive member 23, the changeover of the clutch can be performed by the weak lateral pressure and without slipping.
When rotating the looper threading/stitch forming changeover manual operating portion (looper threading/stitch forming changeover manual lever) 91 to the clockwise direction B (looper threading side), in parallel with the changeover of the above-mentioned clutch 60, the releasing cam 94c (
From the above operation, the connecting of the threading connecting device 120 (
In such state that the changeover of the clutch 60, the connecting of the threading connecting device 120 (
Because the rotation of the drive shaft 5 is locked by the operation of the positioning plate 81, the positioning device 80 functions as the safety apparatus at the time of the looper threading.
In the first time here, because the clutch slider 62 slides to the pump drive member 61 side, the clutch connecting pin 63 contacts to the surface of the connecting pin hole 61a of the pump drive member 61, and the connectable state is accomplished. Accordingly, a looper thread 16 is inserted to the wide-mouthed looper thread insertion slot 113a, 113b, 113c, when the sewing machine motor M becomes ON-state by pushing the threading button 117, the drive shaft pulley 21 that the power from the sewing machine motor M is transmitted by the timing belt MB and the rotary drive member 23 which is fastened through the drive shaft pulley boss 22 rotate, thereby the clutch connecting pin 63 corresponds to the connecting pin hole 61a of the pump drive member 61 and is fitted into it and is connected completely, and because the clutch slider 62 further slides to the pump drive member 61 side, also the clutch changeover pin 65a further moves to the pump drive member 61 side along with it.
In this state, because the tongue piece 170a of the prohibition driven arm 170 in the changeover prohibition mechanism 160 slides on the tip plane portion 168b of the prohibition active arm 168 which is repelled elastically to the upper direction by the spring 169 with the movement of the clutch changeover arm 65 depending on the movement of the clutch changeover pin 65a and is latched together at a side surface portion 168c from the tip plane portion 168b, as described below, the abnormal changeover to the stitch forming state of the looper threading/stitch forming changeover mechanism 90 is prohibited (
Besides, the positioning pin 82 is fitted into the notch 81a of the positioning plate 81, thereby the threading connecting device 120 (
Simultaneously, by the elasticity of the spring 134, the looper thread guide connecting plate 121, 136, therefore, the hollow looper thread guide 7f, 8f, 9f which is connected with nested state with the hollow looper thread guide 7e, 8e, 9e of the hollow looper thread guide 130 moves to the side of the upper looper 7, the lower looper 8 and the looper 9 through the supporting hole 131a, 139a and the thread take-up lever thread guide 133a, 139b, and the looper thread guide outlet 7d, 8d, 9d and the looper thread inlet 7a, 8a, 9a are connected. In this case, the spring 137 buffers the impact when the looper thread guide outlet 7d, 8d, 9d of the hollow looper thread guide 7f, 8f, 9f and the looper thread inlet 7a, 8a, 9a of the upper looper 7, the lower looper 8 and the looper 9 are connected.
When the looper thread guide connecting plate 121 slides to the looper direction, the looper threading/stitch forming changeover switch 119a which is changed over by a switch operational portion 121h of the looper thread guide connecting plate 121 is released, and a motor controller MC becomes OFF-state, and the threading button 117 is changed over to the ON-state.
Thereby, the hollow looper thread guide 130 of the threading connecting device 120 (
In the connecting state of the threading connecting device 120 (
The compressed air from the gas supply pump 41 is pressurized and injected from the delivery port 50b to the air inlet 112a (
Each looper thread is inhaled from the looper thread inhalation area 114 to the looper thread introduction pipe 116 by sucking with this jet stream, and the gas carrying can be performed to the looper loop-taker point thread outlet 7b, 8b, 9b of the upper looper 7, the lower looper 8 and the looper 9 through the hollow looper thread guide 7e, 8e, 9e of the hollow looper thread guide 130 and the looper thread guide outlet 7d, 8d, 9d of the hollow looper thread guide 7f, 8f, 9f of the threading connecting device 120.
The looper thread guide outlet end 114b of the looper thread inhalation area 114 is formed slantingly, thereby the generation of a vortex flow is prevented in the downstream side of the ventilation narrow area 114a.
The bottleneck portion 116c is formed in the inside of the looper thread introduction pipe 116 which is adjacent to the looper thread inhalation area 114 in the downstream side of the ventilation narrow area 114a, and therefore, the gas flow in the ventilation narrow area 114a is promoted by reducing the pressure of the downstream side of the bottleneck portion 116c and the looper thread is inhaled into the looper thread introduction pipe 116 by generating the negative pressure in the looper thread inhalation area 114.
According to the looper thread introduction mechanism 110 of the gas carrying threading device like this, in the insertion operation of the looper thread to the upper looper 7, the lower looper 8 and the looper 9, when inserting the upper looper thread 16a, the lower looper thread 16b and the looper thread 16c from the thread introducing part, the thread introduction of the upper looper thread 16a, the lower looper thread 16b and the looper thread 16c can be performed strongly and certainly by the looper thread introduction mechanism 110.
Besides, according to the gas carrying threading device of sewing machine of the present invention, the pressurized gas for the gas carrying of the threading of the upper looper thread 16a, the lower looper thread 16b and the looper thread 16c is produced by a gas supply pump 41 which is operated by the sewing machine motor M, and the threading of the upper looper thread 16a, the lower looper thread 16b and the looper thread 16c can be performed by one-touch operation.
Further, according to the gas carrying threading device of sewing machine of the present invention, the threading of the upper looper thread 16a, the lower looper thread 16b and the looper thread 16c can be performed in only one hand by the looper threading/stitch forming changeover mechanism 90.
Therefore, according to the gas carrying threading device of sewing machine of the present invention, by connecting the hollow thread guide 7e, 8e, 9e, 7f, 8f, 9f which leads from the thread outlet 7b, 8b, 9b of the loop-taker point of the upper looper thread 16a, the lower looper thread 16b, the looper thread 16c to the thread introducing part which inserts the thread, the complicated thread guard is unnecessary and the threading that the handleability is easy can be performed. And, there are no mistake of the threading, no protrusion of the thread in mid-process, and no entanglement of the inserted upper looper thread 16a, lower looper thread 16b and looper thread 16c with other thread. And because the thread is fed by utilizing the flow of the pressurized gas which is supplied to the hollow thread guide means, the threading can be performed at once by the extremely easy operation.
Here, in the state that a side surface 170b of the tongue piece 170a of the prohibition driven arm 170 of the changeover prohibition mechanism 160 is latched together at a side surface portion 168c of the prohibition active arm 168, because it is impossible that the clutch changeover pin 65a, therefore the clutch changeover arm 65 moves to the stitch forming drive member 64 side even if the changeover is operated to the stitch forming state (counterclockwise direction A) of the looper threading/stitch forming changeover mechanism 90, the abnormal changeover by the special changeover operation to the stitch forming state (counterclockwise direction A) of the looper threading/stitch forming changeover mechanism 90 during the gas supply operation of the gas supply pump is prohibited (
Next, when performing the stitch formation, if the front cover 161 is closed after the looper threading/stitch forming changeover manual operating portion (looper threading/stitch forming changeover manual lever) 91 of the looper threading/stitch forming changeover mechanism 90 is rotated and returned to the counterclockwise direction A (stitch formation side) (
Simultaneously, a rotational angle of the looper threading/stitch forming changeover cam 94 is inhibited by a lever left rotation stopper 94e, the clutch changeover transmitter 70 operates adversely for the above, and the looper threading/stitch forming changeover cam 94 rotates around the changeover cam shaft 92 of a rotary axis and draws the clutch changeover link 72 which is attached pivotally at the clutch changeover connecting arm 94b (
The clutch changeover lever 69 which is attached by the clutch changeover lever shaft 68 at a clutch changeover lever attaching hole 71b which is provided at a clutch changeover lever supporting arm 71a of the clutch changeover lever supporting pedestal 71 is swung to the clockwise direction by a pivot point of the swaging pin 69a by drawing the clutch changeover link 72.
The clutch changeover arm 65 which is attached at the clutch changeover arm attaching hole 73b which is provided at the clutch changeover arm supporting pedestal 73a of the clutch changeover pedestal 73 by the clutch changeover arm shaft 66 and the clutch changeover arm attaching hole 65b is swung to the counterclockwise direction through the clutch changeover spring 67. In this case, the clutch changeover pin 65a slides in the inside of the through-hole 73c which is provided at the clutch changeover arm supporting pedestal 73a and positions at a right end (
As this result, the clutch slider 62 of the clutch 60 slides to the stitch forming drive member 64 side, and the clutch changeover pin 65a interrupts the transmission of the power to the pump drive member 61, and the clutch connecting pin 63 is connected to the connecting pin hole 64a of the stitch forming drive member 64 with the rotary drive member 23. Therefore, the power to the drive shaft 5 is transmitted, and the stitch forming device 30 can be driven (
In this case, the clutch 60 holds other clutch stable state by the elasticity of the clutch changeover spring 67. That is, depending on the manual operation of the looper threading/stitch forming changeover manual operating portion (looper threading/stitch forming changeover manual lever) 91, the clutch changeover spring 67 accomplishes the function which moves the clutch slider 62 to the stitch forming drive member 64 which is fastened at one end of the drive shaft 5 and transmits the power to the stitch forming device 30 so that contact/separation becomes free and which holds the contact state.
Therefore, by the timing belt MB from the sewing machine motor M, the drive shaft 5 can be rotated and driven by the drive shaft pulley 21, the drive shaft pulley boss 22 and the stitch forming drive member 64 from the rotary drive member 23 of the clutch 60.
Besides, by rotating the looper threading/stitch forming changeover manual operating portion (looper threading/stitch forming changeover manual lever) 91 of the looper threading/stitch forming changeover mechanism 90 and returning it to the counterclockwise direction A (stitch formation side), because the releasing cam 94c (
The needle drive mechanism 12 of the stitch forming device 30, the cloth feed mechanism 4 and the looper drive mechanism 10 are driven by the rotation of the drive shaft 5, and the hemstitch seam and (or) the 401 type stitch can be performed on the cloth 25 which is pressed on the throat plate 3 by the presser foot mechanism 19 by the needle 11a, 11b, 11c and the upper looper 7, the lower looper 8, the looper 9 that the looper threading is performed as described above.
Besides, the positioning device 80 operates adversely for the above, and because the press of the follower pin end 84a of the follower pin 84 is released by the pin advance/retreat cam 94d which is provided at the looper threading/stitch forming changeover cam 94, the positioning pin 82 separates from the notch 81a of the positioning plate 81, and because the releasing cam 94c (
As described above, in the gas carrying threading device of sewing machine of the present invention, the abnormal changeover by the special changeover operation to the stitch forming state (counterclockwise direction A) of the looper threading/stitch forming changeover mechanism 90 during the gas supply operation of the gas supply pump is prohibited.
As such the prohibition of the abnormal changeover, while pushing the threading button 117 by one hand, when the special operation which rotates and returns the looper threading/stitch forming changeover manual operating portion (looper threading/stitch forming changeover manual lever) 91 to the counterclockwise direction A (stitch formation side) by another hand without releasing the finger from the threading button 117 in the completion of the looper threading is performed, also such the abnormal changeover is prohibited.
Further, the threading button 117 is pushed at the time of the looper threading, and shortly after releasing the finger from the threading button 117 in the completion of the looper threading, instantly, when the special operation which rotates and returns the looper threading/stitch forming changeover manual operating portion (looper threading/stitch forming changeover manual lever) 91 to the counterclockwise direction A (stitch formation side) is performed, also such the abnormal changeover is prohibited.
Temporarily, if these special operations are performed, the sewing machine motor M is driven in the state that the positioning pin 82 of the positioning device 80 is fitted into the notch 81a of the positioning plate 81 or the sewing machine motor M keeps being driven by inertia, and the drive shaft 5 is rotated forcibly. As the result, the misalignment of the position of the positioning device 80 occurs, and there is a possibility to cause the phenomenon that the looper thread inlet 7a, 8a, 9a and the thread take-up lever hole which is formed at the looper thread take-up lever do not align horizontally to the looper thread guide outlet. However, because such the abnormal changeover is prohibited, the possibility which causes such the phenomenon disappears completely.
As is clear from the above explanation, according to the gas carrying threading device of sewing machine of the present invention, the pressurized gas for the gas carrying of the looper thread is produced by a gas supply pump which is operated by the sewing machine motor, and the threading to the looper can be performed by one-touch operation by the looper threading/stitch forming changeover manual operating portion (looper threading/stitch forming changeover manual lever).
Further, according to the gas carrying threading device of sewing machine of the present invention, the threading to the looper can be performed in one hand by the looper threading/stitch forming changeover manual operating portion (looper threading/stitch forming changeover manual lever) and the looper threading/stitch forming changeover mechanism.
Therefore, according to the gas carrying threading device of sewing machine of the present invention, by connecting the hollow thread guide which leads from the thread introducing part which inserts the thread to the thread outlet of the loop-taker point of the looper, the complicated thread guard is unnecessary and the threading that the handleability is easy can be performed. And, there are no mistake of the threading, no protrusion of the thread in mid-process, and no entanglement of the inserted looper thread with other thread. And because the thread is fed by utilizing the flow of the pressurized gas which is supplied to the hollow thread guide means, the threading can be performed at once by the extremely easy operation.
Besides, according to the gas carrying threading device of sewing machine of the present invention, by providing the particular changeover prohibition mechanism, the special operation of the changeover to the stitch forming state from the looper threading state is not performed during the gas supply operation of the gas supply pump, and because the abnormal changeover to the stitch forming state of the looper threading/stitch forming changeover mechanism is prohibited, the normal changeover to the stitch forming state from the looper threading state can be performed.
The gas carrying threading device of sewing machine in the present invention can be applied suitably to the chain stitch sewing machine such as the serger, the double chain stitch sewing machine, or the interlock stitch sewing machine for performing the threading automatically to the looper by utilizing the pressurized gas.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2011-204753 | Sep 2011 | JP | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/JP2011/075976 | 11/10/2011 | WO | 00 | 2/6/2014 |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2013/042277 | 3/28/2013 | WO | A |
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| 2865470 | Mar 1999 | JP |
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| Entry |
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| International Search Report PCT/JP2011/075976 dated Feb. 14, 2012. |
| Number | Date | Country | |
|---|---|---|---|
| 20140190383 A1 | Jul 2014 | US |
