JPH0235049B2 - SOBOKINIOKERUKARABOBINNOJIDOSOCHAKUHOHO - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention is provided with an upper support type flyer, and after the pipe is stopped full, the bobbin rail is lowered from the winding position to the pipe changing position, and the bobbin rail is lowered from the winding position to the pipe changing position, and is used in an intermittent movement type pipe changing machine or a simultaneous pipe changing machine. A method for automatically installing an empty bobbin between the flyer, which has become empty due to doffing a full bobbin, and a bobbin wheel, in a rover frame that is configured to doff a full bobbin and supply an empty bobbin by a changer. In particular, there is a roving machine which is suitable for changing the tubes of a roving frame every multiple spindles using an intermittent transfer type tube changer, and which is also applicable to simultaneous tube changes using a simultaneous tube changer. The present invention relates to an automatic loading method for empty bobbins.

Prior Art and its Problems In recent years, with the adoption of an upper-support type flyer in roving machines, it has become possible to automate the tube change operation of changing full bobbins and empty bobbins. However, as shown in FIGS. 1 and 2, the bobbin 5 of the generally used roving frame has a plurality of engagement grooves 5b formed radially around the outer periphery of the lower hole 5a. Bobbin wheel 7 shown in FIGS. 3 and 4
and engages the engagement groove 5b with the engagement protrusion 8a implanted on the outer periphery of the engagement part 8 of the bobbin wheel 7 to rotate at high speed integrally with the bobbin wheel 7. It's becoming like that. Therefore,
In a roving machine using a bobbin 5 having such a configuration, the empty bobbin 5 is placed between the flyer and the bobbin wheel after the full bobbin is doffed by the tube changer.
In order to automatically mount A, complete mounting is not possible unless the engagement protrusion 8a of the bobbin wheel and the engagement groove 5b of the empty bobbin 5A match. However, the bobbin wheel 7 of the roving frame is not assembled so that its engaging protrusion 8a is in the same position over all spindles, and moreover, the engaging protrusion 8a of the bobbin wheel 7 is not assembled every time it stops. Stop at any position. For this reason, the engagement grooves 5b of the empty bobbin 5A held at random positions are aligned with the engagement protrusions 8a of the bobbin wheel 7, which stops at different positions between the spindles and is displaced each time the spindle stops. Therefore, it was almost impossible to automatically and reliably attach the empty bobbin 5A to the bobbin wheel 7 of the rover frame. Therefore, in conventional roving machines, only full bobbins are doffed using the doffing machine, and empty bobbins are loaded manually. Furthermore, even when a full bobbin and an empty bobbin are automatically exchanged using a tube changer, most of the empty bobbins are not completely inserted into the bobbin wheel 7, and the operator checks the exchanger for all the empty bobbins. Empty bobbins that were fully loaded had to be manually corrected. In addition, an inclined surface is formed between the lower surface of the conventional bobbin and the engagement groove, and the bobbin rail is raised with the lower hole of the bobbin inserted into the fitting part of the bobbin wheel, so that the engagement protrusion of the bobbin wheel A system has already been proposed in which rotational movement is generated in the bobbin by pressing the inclined surface of the bobbin, and the rotational movement causes the engagement groove of the bobbin to engage with the engagement protrusion of the bobbin wheel. However, even if such a special bobbin is used, there is no guarantee that the automatic insertion will be performed reliably across all spindles because the self-weight of the relatively lightweight empty bobbin is used to automatically insert the bobbin. In order to operate safely, it is necessary to check the installation status of empty bobbins before starting operation, and in order to apply it to an existing roving frame, it was impossible to implement it without changing the conventional bobbin.

Therefore, the present applicant previously proposed in Japanese Patent Application No. 55-168546 (Japanese Unexamined Patent Publication No. 57-95322) a vertically swingable pipe changer on the front side of a roving frame using an upper support flyer. A tube changing machine equipped with an arm is installed, and after the bobbin is stopped full, the bobbin rail is lowered from the winding position to the tube changing position, and the tube changing machine unloads full bobbins and supplies empty bobbins. In the roving machine, the empty bobbin held by the tube changing arm of the tube changing machine is fed between the flyer, which has become empty due to doffing of the full bobbin, and the bobbin wheel, and then the bobbin rail is moved from the lowest position. Raise the empty bobbin to the winding start position and insert it into the fitting part of the flyer's bobbin guide leg and bobbin wheel. The tube changing arm of the tube changing machine is pushed up by the lower flange of the fully loaded empty bobbin, and the lifted tube changing arm's own weight or spring force pushes the incompletely loaded empty bobbin downward and prevents its rotation. suppress,
Next, by rotating the bobbin wheel, the engagement groove of the incompletely installed empty bobbin is engaged with the engagement protrusion of the bobbin wheel to completely install the empty bobbin, and then the tube is changed from the installed empty bobbin. We proposed a method for automatically loading an empty bobbin on a rovering machine with a detachable arm. However, this method of automatically loading empty bobbins is suitable when all the spindles on the roving frame are changed at the same time using a simultaneous bobbin changing machine, but when multiple bobbins are changed using an intermittent moving type bobbin changing machine, When changing tubes for each spindle, it is necessary to raise and lower the bobbin rail each time an empty bobbin is supplied in order to completely attach the incompletely installed empty bobbin that occurs during the tube change to the bobbin wheel. This significantly increases the tube change time, and furthermore, if the bobbin wheel is rotated to completely install the empty bobbin by operating the roving machine (inching), the roving cannot be wound. The roving is sent out from the drafting section without being carried out, and since this inching of the roving frame is performed at least 10 times until the pipe change of all the spindles of the roving frame is completed, the A considerable amount of roving remains between the drafting section and the top of the flyer, and not only is the roving wasted throughout the spindle, but after removing the roving, it is difficult to thread the roving into the flyer and into the empty bobbin. There is an inconvenience in that the end of the roving must be manually wrapped over the entire spindle, and this is not a preferred method when changing the tube using an intermittent moving type tube changer.

Outline and Purpose The present invention has been developed in view of the current state of the roving frame as described above.
A roving frame equipped with an upper-support type flyer, and after the bobbin stops being full, the bobbin rail is lowered from the winding position to the tube changing position, and the tube changing machine unloads full bobbins and supplies empty bobbins. In this process, the empty bobbin holding the tube changing arm of the tube changing machine is attached to the bobbin wheel which has become empty due to doffing of the full bobbin, and when the empty bobbin is attached, the lower engagement groove is engaged with the bobbin wheel. The incompletely installed empty bobbin that has not engaged with the mating protrusion is pressed against the pressing means attached to the tube changing arm of the tube changing machine to press it downward and suppress its rotation. The bobbin wheel of the machine base is rotated by an independent drive device, and by the rotation of the bobbin wheel, the engagement groove of the incompletely installed empty bobbin is engaged with the engagement protrusion of the bobbin wheel, and the empty bobbin is removed. is completely attached to the bobbin wheel, an empty bobbin is attached to the bobbin wheel of all spindles, and the tube changing arm of the tube changing machine is detached from the empty bobbin. After that, raise the bobbin rail to the winding start position, and then The feature is that the upper hole of the empty bobbin attached to the bobbin wheel is inserted into the bobbin guide leg in the center of the upper supported type flyer by raising the bobbin wheel. Automatic loading of empty bobbins, which was a key point,
Even with the conventional bobbin 5 as described above, it can be carried out reliably, and is particularly suitable when changing the tube in a rover frame for each plurality of spindles using an intermittent movement type tube changing machine. Moreover, it is an object of the present invention to provide a method for automatically loading empty bobbins in a revolving frame, which is applicable even when all the spindles are loaded simultaneously using a simultaneous tube changer.

Embodiment Hereinafter, the present invention will be explained in detail by way of an embodiment shown in the drawings. Reference numeral 1 designates a roving frame, on which a top rail 2 suspends double rows of top-supported flyers 3 arranged in a staggered manner between the front and rear rows at a predetermined pitch in the longitudinal direction; Drive shaft 10 and gears 11, 1 arranged inside
2, it is rotated at high speed. Further, a bobbin guide leg 4 is protruded from the center of the flyer 3 and is inserted into the upper hole 5e of the bobbin 5 to always support the upper part of the bobbin throughout the entire movement of forming the roving bobbin. Below the flyer 3 suspended by the top rail 2, there is provided a bobbin rail 6 that moves up and down for forming the roving bobbin.
is arranged and rotated at high speed via a drive shaft 13 and a gear 14. Reference numeral 8 denotes a fitting portion of the bobbin wheel 7 that protrudes from the upper surface of the bobbin rail 6, and the lower hole 5a of the bobbin 5 is fitted into the fitting portion 8, so that the bobbin 5 is engaged with the engagement protrusion 8a implanted in the fitting portion 8. The bobbin 5 is rotated at high speed together with the bobbin wheel 7 by engaging the groove 5b. Therefore, bobbin 5 is
It is fitted between the bobbin guide leg 4 of the flyer 3 and the fitting part 8 of the bobbin wheel 7 and is supported vertically, and rotates at high speed integrally with the bobbin wheel 7, and as the bobbin rail 6 moves up and down. The roving is moved up and down, and the roving twisted by the flyer 3 is wound in layers to form a full bobbin 9. The bobbin 5 of this embodiment has an upper flange 5c formed at its top and a lower flange 5d formed at its lower part.

Further, as shown in FIG. 7, in the Rovering machine 1 of this embodiment, an electromagnetic clutch 15 is interposed on the input side of the drive shaft 13 for the bobbin wheel 7. A geared motor 18 is connected to the other end of the drive shaft 13 via a one-way clutch 17, and the drive shaft 13 is connected to the drive shaft 13 electromagnetically when the rover 1 is stopped. Transmission mechanism 1 via clutch 15
6, and the one-way clutch 17, drive shaft 13 and gear 1 are connected by the geared motor 18.
An independent drive device 38 is provided which independently rotates the bobbin wheel 7 via the bobbin wheel 4. This independent drive device for the bobbin wheel 7 is not limited to the above-mentioned embodiment, and may be configured so that the bobbin wheel 7 can be independently rotated while the roving frame is stopped.

Further, on the front side of the roving frame 1, a peg conveyor 19 is installed on the floor that can rotate along the longitudinal direction of the machine frame, and the peg conveyor 19 has pitches in the longitudinal direction and pitches in the front and rear directions. Pets 20 having a pitch equal to the pitch of the bobbin wheel 7 of the roving frame 1 are arranged in a staggered manner between the front and rear rows, and a full bobbin 9 doffed from the roving frame 1 is attached to the pets 20.
and the empty bobbin 5A that is supplied to the roving frame 1 after doffing.
is inserted and transported in the longitudinal direction of the machine base. In addition, on the floor in front of this peg conveyor 19, two rails 21, 21 are laid across the entire length of the machine platform with appropriate spacing in the front and back direction of the machine platform. A tube changer 22, which will be described later, moves intermittently on the frame 21 from one end of the frame to the other end to change the tubes of the roving frame 1 every plural spindles.

As shown in FIGS. 5 and 6, this intermittent moving pipe changing machine 22 has a machine frame 2 fixedly installed on a trolley 23.
4, two screws 25A and 25B for lifting and lowering are vertically supported with appropriate spacing in the left and right direction in FIG. are connected to each other for synchronous rotation through the screw 2.
A lifting motor 28 is connected to the lifting motor 5A, and a horizontal frame 29 protruding upward from the peg conveyor 19 is screwed to the two lifting screws 25A and 25B. It is designed to be raised and lowered by forward and reverse rotation. Furthermore, two screws 30A and 30B for forward and backward movement are pivotally supported on both sides of this frame 29, and these two screws 30A and 30B can be rotated synchronously via chain wheels 31, 31 and chain 32. A motor 33 for forward and backward movement is connected to one of the screws 30A, and the left and right screws 30A and 30B,
A connecting rod 34 is screwed together, and on the connecting rod 34, pipe changing arms 35A and 35B of two types, long and short, which project horizontally above the peg conveyor 19 maintain the same spacing as the spacing between the bobbin wheels 7 of the roving frame 1. A plurality of pipe switching arms 35A, 35B (the illustrated example shows a case of four) are arranged in series, and these pipe switching arms 35A, 35B are configured to move in the front and rear directions by forward and reverse rotation of the front and rear movement motor 33. These tube change arms 35A, 35B have a fork-shaped front end so that the bobbin 5 can be suspended via the upper flange 5c, and the tube change arms 35A, 35B are A pressing means is attached to the upper side of the tip, which is composed of a pressing plate 36 and a suitable brake piece 37 such as a sponge, which presses the incompletely installed empty bobbin 5A downward when changing the tube and suppresses its rotation. ing.

Next, the operation of this embodiment will be explained below.
When the roving frame 1 in operation approaches a full tube and a full tube forecast signal is issued, the peg conveyor 19 starts to circulate according to the full tube forecast signal, and at one end, the front,
Empty bobbins 5A are sequentially inserted into the third and subsequent pegs 20 excluding the first and second four pegs 20 (in the case of 4-spindle change) in the back row and transported to the other side,
Empty bobbin 5A for one roving frame is sent to Pezg conveyor 1
When the leading peg 20, which is placed on the peg conveyor 19 and has not inserted the empty bobbin 5A, reaches the position corresponding to the first bobbin at one end of the roving frame, the peg conveyor 19
stops. Next, the tube changing machine 22 enters the front side of the machine frame along the rail 21 from the machine frame end side of the roving frame 1, which is almost full, and the tube changing machine 22 is shown in FIGS. 6 and 10. Stops at the first pipe change position. Thereafter, when the roving frame 1 becomes full and the machine in operation stops, the bobbin rail 6 descends from the winding position and stops at the pipe change position shown in FIG. Next, the tube changer 35A, 35 next to the tube changer 22 stopped at the first tube change position shown in FIG. 5 and FIG.
When B descends from the standby position shown in FIG. 5 to the same position as shown in FIG. The roving frame 1 moves forward from the retracted position toward the upper part of the full bobbin 9, and at the forward end, the fork at the tip touches the upper flange 5 of the full bobbin 9.
It is inserted below c. Next, when the tube changing arms 35A and 35B, whose forked portions at their tips are inserted below the upper flange 5c of the full bobbin 9, rise by a predetermined amount by the forward rotation of the lifting motor 28, the tips of the The full bobbin 9 is suspended by the two prongs and rises, and the lower hole 5a of the full bobbin 9 slips out of the fitting part 8 of the bobbin wheel 7. Next, the tube changing arms 35A and 35B that are suspending the full bobbin 9 are moved back from the forward end position by the reverse rotation of the forward and backward movement motor 33, and the suspended full bobbin 9 is placed in a position corresponding to the empty peg 20 on the peg conveyor 19. When it stops, the lifting motor 2 starts again.
8 rotates in the opposite direction and the pipe changing arms 35A, 35B descend,
The lower hole 5a of the suspended full bobbin 9 is inserted into the corresponding peg 20 on the peg conveyor 19, and the first
0 The state shown in FIG. 2 is reached. Next, the tube change arm 35A
and 35B are moved back to the most retracted position by the reverse rotation of the longitudinal motor 33, and then the elevating motor 2
8 is raised again to the standby position shown in FIG. 5 by normal rotation. When the tube changing arms 35A and 35B return to the standby position, the peg conveyor 19 moves in the direction of the arrow from the position shown in FIG. 10 2 to the position shown in FIG. The empty bobbin 5A inserted in advance into the peg 20 on the top 19 corresponds to the empty bobbin wheel 7 that doffed the full bobbin 9, and the empty bobbin 5A doffed the full bobbin 9.
The pipe also moves from the initial pipe change position to the position shown in FIG. 10, 3. Next, the pipe changing arm 35A of the pipe changing machine 22
and 35B are moved to the first position by the reverse rotation of the lifting motor 28.
1. When descending from the standby position shown in FIG. 1 to the position shown in FIG.
It moves forward to the position shown in FIG.
When the bobbin 5A is inserted into the upper part of the peg 20, the tube changing arms 35A and 35B rise again due to the normal rotation of the lifting motor 28, and the empty bobbin 5A is pulled out from the peg 20 and suspended therefrom (FIG. 11, 4). Next, the tube changing arms 35A, 35B suspending the empty bobbin 5A are moved from the position shown in FIG.
When the robot moves forward to the forward end position shown in FIG. Rotate and change tube arm 3
5A and 35B from the position shown in FIG.
The pipe changing arms 35A, 3 are lowered to the position shown in FIG.
The lower hole 5a of the empty bobbin 5A suspended by the bobbin 5B is fitted into the corresponding fitting part 8 of the bobbin wheel 7. However, even if the lower hole 5a of the empty bobbin 5A in this case is fitted into the fitting part 8 of the bobbin wheel 7, the engaging groove provided on the outer periphery of the lower hole 5a
b rarely engages with the engagement protrusion 8a of the bobbin wheel 7, and as shown in FIGS. 11 and 12, most of the empty bobbins 5A
The incompletely installed empty bobbin 5A rests on the engaging protrusion 8a of the tube changing arm 35A, 3, as shown in FIGS. 11 and 12.
5B is lowered, a pressing means consisting of a pressing plate 36 attached to the tips of the tube changing arms 35A, 35B and a suitable damping piece 37 such as a sponge comes into pressure contact with the upper surface of the empty bobbin 5A and presses it downward. Suppress its rotation. On the other hand, the drive shaft 13 for the bobbin wheel of the roving frame 1 is operated by an independent drive device 38 after the frame has stopped.
The transmission mechanism 1 on the input side via the electromagnetic clutch 15
It is separated from 6 and can be driven independently. Therefore, in the state shown in FIG.
When the geared motor 18 is rotated slightly or slowly, the bobbin wheel 7 rotates independently and the position of the engagement protrusion 8a is displaced.
The engagement groove 5b of the incompletely installed empty bobbin 5A is engaged with the empty bobbin 5A, and the empty bobbin 5A is placed on the bobbin wheel 7 and completely installed as shown in FIGS. 11 and 13. Next, the pipe changing arms 35A and 35B, which were at the forward end position, are moved back to the most retracted position shown in FIG. 11 by the reverse rotation of the forward and backward movement motor 33, thereby completing the first pipe changing. When the first pipe change is completed, the peg conveyor 19 and the pipe change machine 22 simultaneously move from the first pipe change position shown in FIG. 10 4 to the next pipe change position shown in FIG. The pipe changer 22 performs the pipe change of the next full bobbin 9 and empty bobbin 5A of multiple spindles in the same manner as described above, and furthermore, the pipe change of each plurality of spindles is performed by the intermittent movement type pipe change machine 22. When the tube change for one roving frame is completed in sequence, the drive shaft 13 for the bobbin wheel in that roving frame 1 is connected again to the input side transmission mechanism 16 via the electromagnetic clutch 15, and the tube change position is changed again. The bobbin rail 6, which had been lowered, is also returned to the winding start position as shown in FIGS. 11 and 14. By raising the bobbin rail 6, the bobbin wheel 7
When the upper hole 5e of the empty bobbin 5A installed in the flyer 3 is inserted into the bobbin guide leg 4 of the flyer 3, and the full weight of the empty bobbin 5A is held above and below it and automatically installed, the operation of the roving frame 1 is restarted. Ru. The tube changing machine 22 that has completed the tube changing operation is moved to the roving frame, where the tubes will be filled next, and stands by, and the full bobbin 9 on the peg conveyor 19 is also moved to the end of the machine by the rotation of the peg conveyor 19. At the end of the movement, it is transferred to the next transfer means and supplied to the next process machine.

In the above embodiment, the tube change of the roving frame by the intermittent moving type tube changer 22 is performed between the roving frame 1 and the peg conveyor 19 installed on the floor in front of the roving frame 1, but the present invention This is not limited to the above-mentioned embodiments, but also applies to the case where the tube change of the roving frame is performed by an intermittent moving type tube change machine with an overhead transfer means installed above the frame of the roving frame. It is possible, and furthermore, it is applicable even when the pipe switching machine is a simultaneous pipe switching machine.

Effects As described above, the present invention is equipped with an upper-support type flyer, and after the bobbin is stopped full, the bobbin rail is lowered from the winding position to the pipe change position, and the pipe change machine performs doffing and emptying of the full bobbin. In a roving frame that is designed to supply bobbins, an empty bobbin held by the rewinding arm of a tube changer is attached to the bobbin wheel, which has become empty due to doffing of a full bobbin, and when the bobbin is attached, An incompletely installed empty bobbin whose lower engagement groove does not engage with the engagement protrusion of the bobbin wheel is pressed against the pressing means attached to the tube changer arm of the tube changer to press it downward and rotate it. In this state, the bobbin wheel of the stopped machine is rotated by an independent drive device.
By this rotation of the bobbin wheel, the engagement groove of the incompletely attached empty bobbin is engaged with the engagement protrusion of the bobbin wheel, and the empty bobbin is completely attached to the bobbin wheel, and the empty bobbin is attached to the fully loaded bobbin wheel. is installed and the tube changing arm of the tube changing machine is detached from the empty bobbin, then the bobbin rail is raised to the winding start position, and as the bobbin rail is raised, the upper hole of the empty bobbin installed on the bobbin rail is opened. By inserting the empty bobbin into the bobbin guide leg in the center of the top-supported flyer, the empty bobbin on the roving machine is automatically installed, so even if the bobbin on the roving machine is an ordinary bobbin that has been widely used, Automatic loading using a changing machine is now possible, which eliminates the biggest bottleneck in automatic tube changing on a roving machine.Moreover, automatic loading of empty bobbins is ensured, so you can check the loading status of empty bobbins after changing tubes. There is no need to change the tube, and the operation of the roving frame can be restarted immediately after changing the tube.The time required for changing the tube is shortened, and the operating rate of the roving frame is improved. Further, the present invention can be applied to the case where pipe changing of a roving frame is performed for each plurality of spindles using an intermittent moving type pipe changing machine. The bobbin wheel is rotated independently by an independent drive device while the machine is stopped, so that the bobbin wheel can be rotated to completely attach a fully loaded empty bobbin to the bobbin wheel. The roving is not sent out from the drafting section by the movement, and a large amount of roving is not wasted when changing the tube. There is no need to thread the thread or wind the end of the roving around the empty bobbin, and if you use an empty bobbin with a raised cloth pasted at the winding start position, it is possible to automatically wind the end of the roving onto the empty bobbin. The roving frame can be restarted immediately after replacement. Furthermore, the present invention is characterized in that it can be applied to the case where all the spindles of the roving frame are changed at the same time using a simultaneous tube changer.

[Brief explanation of drawings]

Figure 1 is a sectional view of a conventional bobbin, Figure 2 is a bottom view of a conventional bobbin, Figure 3 is a top view of the bobbin wheel, Figure 4 is a front view of the upper part of the bobbin wheel, and Figure 5 is the front of the roving frame. 6 is a plan view of the front part of the roving frame, FIG. 7 is a perspective view of the bobbin wheel drive section, FIG. 8 is a partial plan view of the tube changing arm of the tube changer, and FIG.
The figure is a side view of Fig. 8, Fig. 10 is an explanatory plan view showing step by step the operating state of tube change, and Fig. 11 is an explanation showing step by step the automatic loading of an empty bobbin during tube change. Figure 12 is a partially enlarged view showing the empty bobbin incompletely installed, Figure 13 is a partially enlarged view showing the empty bobbin fully installed on the bobbin wheel, and Figure 14 is after tube change. FIG. 3 is a partially enlarged view showing a state in which the bobbin rail is raised to a winding start position. 1... Rover, 3... Flyer, 4... Bobbin guide leg, 5A... Empty bobbin, 5b... Engagement groove, 5e... Upper hole, 6... Bobbin rail, 7...
...Bobbin wheel, 8a...Engaging protrusion, 9...Full bobbin, 22...Tube changer, 35A, 35B...Tube change arm, 36...Press plate, 37...Brake piece, 38...
...Single drive device.

Claims (1)

[Claims] 1 Equipped with an upper support type fryer, after stopping the fryer,
In a roving machine, in which the bobbin rail is lowered from the winding position to the tube changing position, and the tube changer is used to doff a full bobbin and supply an empty bobbin, the bobbin rail is lowered from the winding position to the tube changing position. Attach the empty bobbin held by the tube changing arm of the tube changer to the worn bobbin wheel. Pressing the bobbin against a pressing means attached to the pipe changing arm of the pipe changing machine to press it downward and suppressing its rotation;
In this state, the bobbin wheel of the stopped machine is rotated by the independent drive device, and the rotation of the bobbin wheel engages the engagement groove of the incompletely installed empty bobbin with the engagement protrusion of the bobbin wheel. At the same time, the empty bobbin is completely attached to the bobbin wheel, and after the empty bobbin is attached to the full bobbin wheel and the tube changing arm of the tube changing machine is detached from the empty bobbin, the bobbin rail is raised to the winding starting position. This method automatically installs an empty bobbin in a roving frame, in which the upper hole of the empty bobbin installed on the bobbin wheel is inserted into the bobbin guide leg at the center of an upper supported type flyer by raising the bobbin rail.