EP3628760A1

EP3628760A1 - Bobbin replacement apparatus of spinning machine

Info

Publication number: EP3628760A1
Application number: EP19195031.0A
Authority: EP
Inventors: Kohei Sato; Yasuyuki Kawai; Daisuke Tsuchida
Original assignee: Toyota Industries Corp
Current assignee: Toyota Industries Corp
Priority date: 2018-09-25
Filing date: 2019-09-03
Publication date: 2020-04-01
Anticipated expiration: 2039-09-03
Also published as: JP2020050978A; CN110937470B; CN110937470A; JP7020355B2; EP3628760B1

Abstract

A bobbin replacement apparatus (20) of a spinning machine includes a first bobbin support axis (J1) extending in parallel to a vertical axis (J5), a second bobbin support axis (J2) that is disposed at a position shifted from the first bobbin support axis (J1) in a horizontal direction, a holder axis (J3),and a lift axis (J4). When the lift axis (J4) and the second bobbin support axis (J2) are disposed in parallel, the angle between the holder axis (J3) and the lift axis (J4) is maintained at a first angle. When the lift axis (J4) of the lifting mechanism (25) is tilted by the tilting mechanism (26), the angle between the holder axis (J3) and the lift axis (J4) is maintained at a second angle, and the holder axis (J3) and the second bobbin support axis (J2) are disposed coaxially.

Description

The present disclosure relates to a bobbin replacement apparatus of a spinning machine.

BACKGROUND ART

Some spinning machines includes a simultaneous bobbin replacement apparatus that performs the operation replacing bobbin mounted to a plurality of spindles in all the spindles stations simultaneously, i.e., replacing full bobbins with empty bobbins in all the spindles at the same time. Japanese Patent Application Publication H07-126930 discloses such a simultaneous bobbin replacement technique.
The above-cited Publication discloses a simultaneous bobbin replacement apparatus that includes a pantograph mechanism that moves the doffing bar having bobbin holder upward and downward, and a transport mechanism that transports the entire pantograph mechanism between a position close to the spinning machine and a position away from the spinning machine by rotating the pantograph mechanism about the drive shaft.
The simultaneous bobbin replacement apparatus of the above-cited Publication includes a bobbin transport member that transports bobbins using a plurality of peg trays and is disposed below a spindle rail to which a plurality of spindles are provided. The replacement of the bobbins mounted to the spindles, the full bobbin with the empty bobbin, is accomplished by the upward and downward movement of the doffing bar by the pantograph mechanism and the rotational movement of the pantograph mechanism by the moving mechanism.
Specifically, the bobbin holder holds the empty bobbin mounted on the peg tray with the upward and downward movement of the doffing bar caused by the pantograph mechanism. The bobbin holder moves upward and downward in accordance with the upward and downward movement of the doffing bar, and holds the empty bobbin using this movement.
Then, the empty bobbin held by the bobbin holder is mounted on the intermediate peg with the upward and downward movement of the doffing bar caused by the pantograph mechanism and the rotational movement of the pantograph mechanism caused by the pantograph mechanism.
Then, the bobbin holder holds a full bobbin mounted on the spindle with the upward and downward movement of the doffing bar caused by the pantograph mechanism, and then such full bobbin held by the bobbin holder is mounted on the peg tray by the upward and downward movement of the doffing bar caused by the pantograph mechanism and the rotational movement of the pantograph mechanism caused by the moving mechanism.
Subsequently, the bobbin holder holds the empty bobbin mounted on the intermediate peg with the upward and downward movement of the doffing bar by the pantograph mechanism and the rotational movement of the pantograph mechanism by the moving mechanism, such empty bobbin is mounted on the spindle by the upward and downward movement of the doffing bar by the pantograph mechanism and the rotational movement of the pantograph mechanism by the moving mechanism. Accordingly, the bobbins mounted on the spindle are replaced from the full bobbin to the empty bobbins.
However, the simultaneous bobbin replacement apparatus of the above-cited Publication increases the height of the spinning machine due to the following reasons.
When mounting the bobbin on the peg trays of the bobbin transport member and removing therefrom, the bobbin transport member may be moved upward and downward the elevation movement of the doffing bar by the pantograph mechanism, instead of moving the bobbin holder upward and downward with the upward and downward movement of the doffing bar by the pantograph mechanism. However, it requires a new driving system to move the bobbin transport member upward and downward in order to move the bobbin transport member upward and downward, which makes the configuration of the simultaneous bobbin replacement apparatus complex and large. Therefore, it is preferable that the mounting the bobbin on the peg trays and removing therefrom are accomplished by using the upward and downward movement of the doffing bar by the pantograph mechanism.
However, in order to accomplish the mounting the bobbin on the peg trays and removing therefrom by the upward and downward movement of the doffing bar by the pantograph mechanism, it requires to arrange the spindle and the peg tray with a large space secured therebetween in the vertical direction and to dispose the bobbin support axis of the spindle and the bobbin support axis of the peg tray coaxially. In addition, the bobbin holder needs to be moved upward and downward when mounting the bobbin on spindle and removing therefrom and when mounting the bobbin on the peg trays of the bobbin transport member and removing therefrom. Therefore, spaces need to be secured above the spindle and above the peg tray for the operation to mount and remove the bobbin, in addition to the dimension of the bobbin in the longitudinal direction thereof. As a result, the height of the spinning machine is increased.
The above-mentioned space for the operation to mount and remove the bobbin is for the upward and downward movement of the bobbin holder with the upward and downward movement of the doffing bar by the pantograph mechanism. The bobbin support axis is an imaginary axis that is set at parts such as a spindle and a peg tray on which the bobbin is mounted insertably and removably. The spindle and the peg tray support the bobbin with the bobbin support axis at the center of the bobbin. In the simultaneous bobbin replacement apparatus of the above-cited Publication, the bobbin support axis of the spindle and the bobbin support axis of the peg tray are disposed in parallel with the vertical axis, respectively. In the present specification, the vertical axis corresponds to the axis extending in parallel to the direction of the gravity.
As a means for reducing the height of the spinning machine, it may be considered that one of or both of the bobbin support axis of the spindle and the bobbin support axis of the peg tray are inclined relative to the vertical axis. If the bobbin support axis of the spindle is tilted, however, the gravitational force acts on the spindle and the bobbin in the tilted direction when the bobbin is being rotated by the spindle, which makes the rotation of the spindle and the bobbin unstable. Additionally, if the bobbin support axis of the peg tray is tilted, the bobbin may be come off from the peg tray during the transport of the bobbin by the bobbin transport member. Further, the configuration of a winder device that receives, from the bobbin transport member, the full bobbin having completed the winding of yarn in the spinning machine may be greatly altered so as to correspond to the tilting of the bobbin support axis of the peg tray.
The present disclosure is directed to providing a bobbin replacement apparatus of a spinning machine that permits reducing the height of the spinning machine without tilting a bobbin support axis relative to a vertical axis.

SUMMARY

In accordance with an aspect of the present disclosure, there is provided a bobbin replacement apparatus of a spinning machine includes a bobbin support member that supports a bobbin with a first bobbin support axis extending in parallel to a vertical axis arranged at a center of the bobbin, a bobbin transport member that supports the bobbin with a second bobbin support axis that is disposed at a position shifted from the first bobbin support axis in a horizontal direction arranged at the center of the bobbin, a bobbin holder that holds the bobbin with a holder axis arranged at the center of the bobbin, a doffing bar that supports the bobbin holder, a lifting mechanism that moves the doffing bar upward and downward in a direction parallel to a lift axis, and a tilting mechanism the entire lifting mechanism relative to the vertical axis. The bobbin replacement apparatus further includes a support mechanism supporting the bobbin holder via the doffing bar between the lifting mechanism and the doffing bar. The support mechanism includes a position changing mechanism that changes a position of the bobbin holder so that an angle between the holder axis and the lift axis is set at least two different angles, wherein the angle between the holder axis and the lift axis is maintained at a first angle when the lift axis and the second bobbin support axis are disposed in parallel, and the angle between the holder axis and the lift axis is maintained at a second angle that is greater the first angle when the lift axis of the lifting mechanism is tilted by the tilting mechanism. The holder axis and the second bobbin support axis are disposed coaxially when the support mechanism maintains the angle between the holder axis and the lift axis at the first angle, and the holder axis and the first bobbin support axis are disposed coaxially when the support mechanism maintains the angle between the holder axis and the lift axis at the second angle.
Other aspects and advantages of the present disclosure will become apparent from the following description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The present disclosure together with objects and advantages thereof may best be understood by reference to the following description of the presently preferred embodiments together with the accompanying drawings in which:

FIG. 1 is a side view, showing an example of the configuration of a bobbin replacement apparatus of a spinning machine according to an embodiment of the present disclosure;
FIG. 2 is a front view of the bobbin replacement apparatus of the spinning machine of FIG. 1;
FIG. 3 is a perspective view of the bobbin replacement apparatus of the spinning machine of FIG. 1;
FIG. 4 is a view, showing a configuration of a bobbin transport member;
FIG. 5 is a view showing an arrangement of a peg tray and an intermediate peg in a spinning machine longitudinal direction;
FIG. 6 is a view, showing a configuration of a bobbin support member;
FIG. 7 is a side view, showing various members before a pantograph mechanism is tilted;
FIG. 8 is a side view, showing various members after the pantograph mechanism is tilted;
FIG. 9 is a perspective view, showing the mounting of the pantograph mechanism, a doffing bar, and a support mechanism, as viewed from the front side;
FIG. 10 is a perspective view, showing the mounting of the pantograph mechanism, the doffing bar, and the support mechanism, as viewed from the frame side;
FIG. 11 is a partial cross-sectional view, showing the support mechanism when the pantograph mechanism is disposed standing vertically;
FIG. 12 is a partial cross-sectional view, showing a state of the support mechanism when the pantograph mechanism is tilted;
FIG. 13 is a side view, showing an example of the configuration of the support mechanism in which a spring member is provided;
FIG. 14 is a side view, showing another example of the configuration of the support mechanism in which a magnet is provided;
FIG. 15 is a side view, showing an example of a position changing mechanism; and
FIG. 16 is a side view, showing another example of the position changing mechanism.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The following will describe an embodiment of the present disclosure with reference to the accompanying drawings.
FIG. 1 is a side view, showing an example of the configuration of a bobbin replacement apparatus of a spinning machine according to an embodiment of the present disclosure. FIGS. 2 and 3 are a front view and a perspective view of the bobbin replacement apparatus. In the description of the present embodiment, a pot spinning machine will be described as an example of the spinning machine.
As shown in FIG. 1, a pot spinning machine 10 includes a plurality of fixed covers 12 that are disposed on opposite sides of a frame 11. It is effective to reduce the height of the frame 11 to reduce the height of the pot spinning machine 10. As shown in FIG. 2, the fixed covers 12 are disposed along a spinning machine longitudinal direction X. The fixed cover 12 has a cylindrical shape. A pot (not shown) is disposed in the fixed cover 12. The pot spinning machine 10 is provided with a plurality of spindles on opposite sides of the frame 11. A spindle represents a unit of spinning. The fixed cover 12 and the pot are provided for each spindle. Each spindle is provided with a draft device, a sliver suction pipe, a yarn introduction pipe and the like (none of which are shown), in addition to the fixed cover 12 and the pot.
The following will briefly describe a basic operation of the pot spinning machine 10. Firstly, in the pot spinning machine 10, a yarn stretched by the draft device is supplied to the yarn introduction pipe through the sliver suction pipe, which is introduced into the pot through the introduction pipe. The yarn is discharged from the bottom end of the introduction pipe in the pot, twisted by the rotation of the pot and laid on the inner wall of the pot. At this time, the position of the yarn introduction pipe is gradually moved downward while the yarn introduction pipe is repeatedly reciprocated in the vertical direction at predetermined intervals. Accordingly, a cake is formed on the inner wall of the pot. With the pot kept rotated, a bobbin is inserted into the pot and a yarn forming the cake is unwounded and wounded on the bobbin. Then, a full bobbin having a predetermined amount of yarn wound on by winding of the yarn is removed from the pot.
A bobbin replacement apparatus 20 is configured to replace the full bobbin with an empty bobbin to the pot spinning machine 10 operating in this manner. The bobbin replacement apparatuses 20 are disposed in pair on the opposite sides of the frame 11 corresponding to the plurality of spindles. The bobbin replacement apparatus 20 forms a simultaneous bobbin replacement apparatus that simultaneously replaces bobbins with respect to the plurality of spindles of the pot spinning machine 10.
The bobbin replacement apparatus 20 includes a bobbin transport member 21 that transports the bobbin, a bobbin support member 22 that supports the bobbin, a bobbin holder 23 that holds the bobbin, a doffing bar 24 that supports the bobbin holder 23, a pantograph mechanism 25 serving as a lifting mechanism, a tilting mechanism 26 that tilts the entire pantograph mechanism 25, and a support mechanism 27 that supports the bobbin holder 23 via the doffing bar 24.

(Bobbin transport member)

The bobbin transport member 21 is configured to transport bobbins for carrying in empty bobbins to and carrying out full bobbins from the pot spinning machine 10 provided with the plurality of spindles. As shown in FIG. 4, the bobbin transport member 21 includes a peg tray 31 and transports a bobbin 30 using the peg tray 31. The peg tray 31 has integrally therewith a peg 31a having a pointed shape. The peg tray 31 and the peg 31a have a circular shape in plan view. The bobbin 30 is configured to be inserted into or removed from the peg 31a of the peg tray 31. The peg tray 31 supports the bobbin 30 with the second bobbin support axis J2 that is disposed coaxially with the axis of the peg 31a at the center. Thus, the central axis of the bobbin 30 supported by the peg tray 31 is disposed coaxially with the second bobbin support axis J2. The second bobbin support axis J2 is an imaginary axis that extends in parallel with the vertical axis J5, which is an imaginary axis extending in the direction of the gravity. Accordingly, in the bobbin transport member 21, the bobbin 30 is supported by the peg tray 31 with the bobbin 30 arranged standing in the vertical direction.
A plurality of peg trays 31 is disposed in the peg tray passage formed by a guide member 32. The guide member 32 forms a rail extending long in the spinning machine longitudinal direction X. The peg trays 31 are disposed at constant pitches along the spinning machine longitudinal direction X. The pitch between any two adjacent peg trays 31 is set at the same pitch between any two pots disposed along the spinning machine longitudinal direction X.
The bobbin transport member 21 transports the bobbin 30 mounted on each peg tray 31 together with the peg tray 31. As shown in FIG. 5, the peg trays 31 are disposed abutting to each other along the spinning machine longitudinal direction X. An intermediate peg 33 is disposed on a border between any two adjacently disposed peg trays 29 31 in the spinning machine longitudinal direction X. The intermediate peg 33 is provided for temporarily keeping an empty bobbin when the bobbin replacement apparatus 20 replaces bobbins. The dimension of the half pitch Pb between any two adjacently disposed intermediate pegs 33 in the spinning machine longitudinal direction X are set a half of the dimension of the pitch Pa between any two adjacently disposed pegs 31a in the spinning machine longitudinal direction X. In other words, the intermediate peg 33 is disposed at an intermediate position between two adjacently disposed pegs 31a in the spinning machine longitudinal direction X.

(Bobbin support member)

The bobbin support member 22 supports the bobbin 30 that is used for rewinding of the yarn when spinning a yarn in the pot spinning machine 10. Additionally, the bobbin support member 22 supports the full bobbin that is disposed before replacing the bobbins and the empty bobbin that is disposed after replacing bobbins at different timings when the bobbin replacement operation is performed by the bobbin replacement apparatus 20. Thus, the bobbin support member 22 belongs to the pot spinning machine 10 and also to the bobbin replacement apparatus 20.
The bobbin support member 22 supports the bobbin 30 with one to one relation to the pot provided for each spindle. The bobbin support member 22 includes a bobbin rail 36 and supports the bobbin 30 with the bobbin 30 disposed vertically standing on the bobbin rail 36. As shown in FIG. 6, the bobbin rail 36 has a support pin 37. The support pin 37 has a circular shape in plan view. The support pin 37 is disposed standing vertically from the upper surface of the bobbin rail 36. The bobbin 30 is insertable and removable with respect to the support pin 37. The bobbin rail 36 supports the bobbin 30 with the first bobbin support axis J1 extending in the axis of the support pin 37 positioned at the center of the bobbin 30. At this time, the central axis of the bobbin 30 supported by the bobbin rail 36 is disposed coaxially with the first bobbin support axis J1. Thus, the bobbin 30 is supported in the bobbin support member 22 by the bobbin rail 36 with the bobbin 30 disposed standing vertically.
The first bobbin support axis J1 is an imaginary axis extending in parallel with the vertical axis J5. Thus, the above-mentioned second bobbin support axis J2 and the first bobbin support axis J1 extend in parallel with each other. However, the second bobbin support axis J2 and the first bobbin support axis J1 are set at their respective positions that are shifted in the horizontal direction to each other. Specifically, the second bobbin support axis J2 and the first bobbin support axis J1 are set at positions shifted from each other in the spinning machine short direction Y that extends perpendicularly to the spinning machine longitudinal direction X. In addition, the second bobbin support axis J2 is positioned farther from the frame 11 than the first bobbin support axis J1 is in the spinning machine short direction Y.
The bobbin support member 22 is movable upward and downward by a lifter device 38. The lifter device 38 moves the bobbin support member 22 upward from its initial position for winding a yarn on the bobbin 30 in the pot. The lifter device 38 moves the bobbin support member 22 downward to the initial position for removing the bobbin 30 on which a yarn has been wound in the pot. When the bobbin support member 22 is positioned at the initial position, there is a predetermined height difference H between the bobbin transport member 21 and the bobbin support member 22 (see FIG. 1). The dimension of the predetermined height difference H is smaller than the dimension of the bobbin 30 in the longitudinal direction thereof. Thus, the bottom portion of the bobbin 30 supported by the bobbin support member 22 is arranged at a position lower than the upper portion of the bobbin 30 supported by the bobbin transport member 21. The bobbin 30 supported by the bobbin support member 22 and the bobbin 30 supported by the bobbin transport member 21 shares part of a space in the height direction of the frame 11.
Since the first bobbin support axis J1 and the second bobbin support axis J2 are disposed at positions shifted in the horizontal direction according to the present embodiment, the bobbins 30 supported with the first and second bobbin support axes J1, J2 as their respective centers do not interfere with each other. In a case where the first and second bobbin support axes J1, J2 are disposed coaxially, on the other hand, to avoid the interference between the bobbins 30 supported with the first and second bobbin support axes J1, J2 as their respective centers, it requires securing at least the dimension of the bobbin 30 in the longitudinal direction thereof for the height difference between the bobbin transport member 21 and the bobbin support member 22. According to the configuration of the present embodiment, the dimension of the frame 11 in height may be reduced, as compared with the case where the first and second bobbin support axes J1, J2 are disposed coaxially.

(Bobbin holder)

The bobbin holder 23 is configured to holds the bobbin 30 while replacing the bobbins. The bobbin holder 23 has a bobbin insertion hole (not shown) into which the top end of the bobbin 30 is inserted, and holds the bobbin 30 with the holder axis J3 (FIG. 1) extending through the bobbin insertion hole disposed at the center of the bobbin 30. The holder axis J3 is an imaginary axis, which is positioned coaxially with the central axis of the bobbin 30 when the bobbin 30 is held by the bobbin holder 23.
A bobbin holder disclosed in Japanese Patent Application Publication H09-087931 may be used for the bobbin holder 23. The bobbin holder disclosed in the above-cited Publication includes a fixed holder member, a movable holder member, a diaphragm, and an urging member. In this bobbin holder, the movable holder member is moved from the opened portion to the holding position by applying a fluid pressure to the movable holder member through the diaphragm, so that a bobbin is held between the fixed holder member and the movable holder member. In addition, in this bobbin holder, the movable holder member is moved to the release position by urging member by releasing the fluid pressure to the diaphragm, thus the holding of the bobbin is released.

(Doffing bar)

As shown in FIG. 2, the doffing bar 24 extends long in the spinning machine longitudinal direction X and is disposed extending. The doffing bar 24 moves upward and downward with its horizontal posture maintained by driving of the pantograph mechanism 25. The plurality of bobbin holders 23, which are provided in one to one relation to the pot of each spindle, are along the longitudinal direction of the doffing bar 24. Each bobbin holder 23 is mounted to the doffing bar 24 with a screw and the like. Thus, the plurality of the bobbin holders 23 are supported by the doffing bar 24.

(Pantograph mechanism)

The pantograph mechanism 25 is configured to move the doffing bar 24 upward and downward in the direction of the lift axis J4 (FIGS. 1 and 2). The lift axis J4 is an imaginary axis. When the lift axis J4 is disposed in parallel with the vertical axis J5, the doffing bar 24 moves up and down in the direction parallel to the lift axis J4, that is, the vertical direction. The pantograph mechanism 25 is rotatably supported with the drive shaft 42 disposed at the center of the pantograph mechanism 25. The drive shaft 42 is disposed extending horizontally along the spinning machine longitudinal direction X. The drive shaft 42 is reciprocally movable in the spinning machine longitudinal direction X with the operation of a power cylinder (not shown).
The pantograph mechanism 25 includes a first link 43 and a second link 44. One end of the first link 43 is connected to a fixed member 62 by a connection pin 45. The doffing bar 24 is mounted to the fixed member 62. A plurality of first links 43 and a plurality of second links 44 are provided at predetermined intervals in the spinning machine longitudinal direction X. The doffing bar 24 is disposed horizontally between the upper end portions of the two first links 43 disposed adjacently to each other in the spinning machine longitudinal direction X. The other end of the first link 43 is connected to a moving bracket 47 by a connection pin 46. The connection pins 45, 46 form link joints of the pantograph mechanism 25, respectively. The link joint formed by the connection pin 45 and the link joint formed by the connection pin 46 are disposed on the lift axis J4. The moving bracket 47 is fixed to the drive shaft 42 so as to move integrally with the drive shaft 42 in the spinning machine longitudinal direction X.
The second link 44 has a length a half of the first link 43. The one end of the second link 44 is connected to an intermediate portion of the first link 43 in the length direction thereof by a connection pin 48. The other end of the second link 44 is connected to a support bracket 50 by a connection pin 49. The connection pins 48, 49 form link joints of the pantograph mechanism 25, respectively. A fixed bracket 51 restricts the movement of the support bracket 50 in the axial direction of the drive shaft 42. The support bracket 50 is mounted on the drive shaft 42 for rotation therewith while permitting the movement of the drive shaft 42 in the spinning machine longitudinal direction X.
In the pantograph mechanism 25 having the above-described configuration, the reciprocating movement of the drive shaft 42 in the spinning machine longitudinal direction X driven by the power cylinder (not shown) causes the doffing bar 24 to move upward and downward with the movement of the first link 43 and the second link 44. The bobbin holder 23 moves upward and downward with the doffing bar 24 with the upward and downward movement of the doffing bar 24.

(Tilting mechanism)

The tilting mechanism 26 is configured to tilt the entire pantograph mechanism 25 relative to the vertical axis J5. The lift axis J4 of the pantograph mechanism 25 tilts relative to the second bobbin support axis J2 by tilting the pantograph mechanism 25 by the tilting mechanism 26. The tilting mechanism 26 includes the above-described drive shaft 42 and tilts the entire pantograph mechanism 25 by rotating the pantograph mechanism 25 about the drive shaft 42. Thus, the drive shaft 42 serves as axis of rotation when the tilting mechanism 26 tilts the pantograph mechanism 25. With the rotational movement of the pantograph mechanism 25 caused by the tilting mechanism 26, the bobbin holder 23 and the doffing bar 24 move in directions in which the bobbin holder 23 and the doffing bar 24 approach or move away from the frame 11.
Specifically, when the pantograph mechanism 25 rotates in the clockwise direction CW about the drive shaft 42 from a state where the lift axis J4 of the pantograph mechanism 25 extends vertically, as shown in FIG. 7, the bobbin holder 23 and the doffing bar 24 move in direction to approach the frame 11. This operation of the tilting mechanism 26 tilts the pantograph mechanism 25 to the vertical axis J5 (hereinafter such operation will be referred to as the first operation). On the other hand, as shown in FIG. 8, when the pantograph mechanism 25 rotates in the counterclockwise direction CCW about the drive shaft 42 from a state where the lift axis J4 of the pantograph mechanism 25 is tilted to the vertical axis J5, the bobbin holder 23 and the doffing bar 24 move in a direction to move away from the frame 11. This operation of the tilting mechanism 26 cancels the tilting of the pantograph mechanism 25 to the vertical axis J5 (hereinafter such operation will be referred to as the second operation)
For the configuration of the tilting mechanism 26, a tilting mechanism disclosed in the above-cited Japanese Patent Application Publication No. H07-126930 may be used. A lever 50a formed integrally with the support bracket 50 is rotated about the drive shaft 42 by an air cylinder (not shown), and thereby the entire pantograph mechanism 25 rotates with the support bracket 50 about the drive shaft 42. The tilting mechanism 26 is not limited to the configuration disclosed in the above-cited Publication as long as it can rotates the entire pantograph mechanism 25 about the drive shaft 42.

(Support mechanism)

The support mechanism 27 is disposed between the pantograph mechanism 25 and the doffing bar 24, and supports the bobbin holder 23 through the doffing bar 24. The support mechanism 27 includes a position changing mechanism 61 configured to change the position of the bobbin holder 23 so that at least two angles is set by an angle between the holder axis J3 of the bobbin holder 23 and the lift axis J4 of the pantograph mechanism 25. The position changing mechanism 61 includes a hinge 66. The position of the bobbin holder 23 is determined by the angle between the holder axis J3 and the lift axis J4, and the position of the bobbin holder 23 is changed by a change of such angle.
FIG. 9 is a perspective view, showing the mounting of the pantograph mechanism, a doffing bar and a support mechanism, as viewed from the front side, and FIG. 10 is a perspective view, showing the mounting of the pantograph mechanism, the doffing bar and the support mechanism, as viewed from the frame side. Additionally, FIG. 11 is a partial cross-sectional view, showing the support mechanism when the pantograph mechanism is disposed standing vertically, and FIG. 12 is a partial cross-sectional view, showing a state of the support mechanism when the pantograph mechanism is tilted.
The support mechanism 27 includes the fixed member 62 and the movable member 63. The fixed member 62 is a member that is fixed to the pantograph mechanism 25. A recess 64 is formed in the fixed member 62. The upper end portion of the first link 43 is inserted into the recess 64. The upper end portion of the first link 43 is connected to the fixed member 62 by the connection pin 45 with the upper end portion of the first link 43 inserted into the recess 64. A protruded portion 65 is formed in the upper end portion of the fixed member 62. The protruded portion 65 is formed integrally with the fixed member 62.
The movable member 63 is connected to the fixed member 62 via the hinge 66. The hinge 66 includes a pin 66a, and a pair of leaf members 66b, 66c that are rotatable about the pin 66a. The pin 66a is disposed in parallel to the drive shaft 42. One of the leaf members 66b, 66c (one leaf member 66b) is fixed to the lower surface of the fixed member 62 by a screw 67a and the other of the leaf members 66b, 66c (the other leaf member 66c) is fixed to the lower surface of the movable member 63 by a screw 67b. Thus, the movable member 63 is rotatable about the pin 66a of the hinge 66 and supported by the fixed member 62. The doffing bar 24 is fixed to the movable member 63 by a screw and the like. With the rotation of the movable member 63 about the pin 66a of the hinge 66, the angle between the holder axis J3 and the lift axis J4 is changed, so that the position of the bobbin holder 23 is changed.
A hook portion 68 is formed in the movable member 63. The hook portion 68 is formed so as to correspond to the protruded portion 65 of the fixed member 62. An adjustment screw 69 is fixed to the movable member 63 at a position facing the hook portion 68. The adjustment screw 69 is fastened to a screw hole 70 formed in the movable member 63. The adjustment screw 69 serves as the adjustment member that adjusts the position change amount of the bobbin holder 23 by the position changing mechanism 61. In the present embodiment, as an example, the adjustment screw 69 is provided by the hex screw. A predetermined amount of the tip of the adjustment screw 69 projects from the surface of the movable member 63. The projected amount of the adjustment screw 69 is adjustable by rotating the adjustment screw 69. The tip of the adjustment screw 69 is a part that is set in contact with the protruded portion 65 of the fixed member 62 when changing the position of the bobbin holder 23 by the position changing mechanism 61. The position change amount of the bobbin holder 23 may be changed by adjusting the projection amount of the adjustment screw 69. The adjustment of the position change amount of the bobbin holder 23 using the adjustment screw 69 is advantageous when adjusting the position of the bobbin holder 23 by the position changing mechanism 61 so as to position the holder axis J3 relative to the first bobbin support axis J1 and dispose the holder axis J3 and the first bobbin support axis J1 coaxially.
A contact portion 71 is formed in the movable member 63. The contact portion 71 may be formed integrally with or separately from the movable member 63. In the present embodiment, as an example, the contact portion 71 is fixed to the upper portion of the movable member 63 by a screw or the like. The contact portion 71 has a half-moon shape in side view and projects towards the fixed cover 12.
A stopper 75 is fixed to the frame 11. The stopper 75 forms a part of the bobbin replacement apparatus 20 and is disposed so as to surround one of the fixed covers 12. The stopper 75 is fixed to the frame 11 by a screw or the like. The stopper 75 is arranged at a position facing the contact portion 71 of the movable member 63 in the spinning machine short direction Y. Accordingly, when changing the position of the bobbin holder 23 with the position changing mechanism 61, the contact portion 71 of the movable member 63 is configured to be in contact with the stopper 75 by tilting the entire pantograph mechanism 25 by the tilting mechanism 26.
The movable member 63 is mounted to the bobbin holder 23 via the doffing bar 24. The doffing bar 24 and the bobbin holder 23 are disposed shifted in one direction relative to the pin 66a of the hinge 66, so that the gravitational center of the whole mechanism including the movable member 63, the doffing bar 24, and the bobbin holder 23 is shifted in such one direction. The rotational force F1 in the clockwise direction in FIG. 11 is applied to the movable member 63 by the weight of the bobbin holder 23 and the doffing bar 24, which causes the hook portion 68 of the movable member 63 to be in contact with the protruded portion 65 of the fixed member 62.
As shown in FIG. 7, the support mechanism 27 having the above-described configuration maintains the angle between the holder axis J3 and the lift axis J4 at a first angle that is the same as the angle θ1 when the lift axis J4 of the pantograph mechanism 25 is arranged in parallel with the second bobbin support axis J2. The angle θ1 is the angle between the lift axis J4 and the vertical axis J5, and equal to the angle between the lift axis J4 and the second bobbin support axis J2, since the second bobbin support axis J2 extends vertically. The angle θ1 becomes 0° when the lift axis J4 of the pantograph mechanism 25 is arranged in parallel to the second bobbin support axis J2. As shown in FIG. 8, when the lift axis J4 of the pantograph mechanism 25 is tilted relative to the second bobbin support axis J2 by the tilting mechanism 26, the support mechanism 27 maintains the angle between the holder axis J3 and the lift axis J4 at the second angle, which is the same angle with the angle θ2. The angle θ2 is the angle between the lift axis J4 and the vertical axis J5, and is equal to the angle between the lift axis J4 and the first bobbin support axis J1, since the first bobbin support axis J1 extends vertically. When the lift axis J4 of the pantograph mechanism 25 is tilted relative to the second bobbin support axis J2, the angle θ2 becomes greater than the angle θ1. The following will describe in detail.
When the lift axis J4 of the pantograph mechanism 25 and the second bobbin support axis J2 are arranged in parallel, the movable member 63 is subjected to the rotational force F1 in the clockwise direction in FIG. 11 due to the weight of the bobbin holder 23 and the doffing bar 24. The hook portion 68 of the movable member 63 is placed in contact with the protruded portion 65 of the fixed member 62 by this rotational force F1. This permits maintaining the angle between the holder axis J3 and the lift axis J4 at the first angle that is the same angle with the angle θ1 (FIG. 7). At this time, the holder axis J3 is arranged in parallel with the second bobbin support axis J2. Thus, the first angle is maintained at 0°. While the first angle is maintained, the holder axis J3 and the second bobbin support axis J2 are arranged coaxially, which means that two axes are disposed on the same axis. The holder axis J3 and the second bobbin support axis J2 are coaxially arranged so that the bobbin holder 23 can hold the bobbin 30 supported with the second bobbin support axis J2 at the center of the bobbin 30 in the bobbin transport member 21.
On the other hand, when the entire pantograph mechanism 25 is tilted by the tilting mechanism 26, as shown in FIG. 12, the contact portion 71 of the movable member 63 hits the stopper 75. Consequently, the movable member 63 receives the reaction force F2 caused by the contact portion 71 of the movable member 63 hitting the stopper 75 and thereby rotates in the counterclockwise direction in FIG. 12 about the pin 66a of the hinge 66. When the movable member 63 is thus rotated, the hook portion 68 is separated from the protruded portion 65 and the tip of the adjustment screw 69 hits the protruded portion 65. This permits maintaining the axis between the holder axis J3 and the lift axis J4 at the second angle that is the same as the angle θ2 (FIG. 8). When the pantograph mechanism 25 is tilted relative to the second bobbin support axis J2, the lift axis J4 tilts with the pantograph mechanism 25. This causes the holder axis J3 to tilt relative to the lift axis J4 at the angle θ2 in the direction opposite from the tilting direction of the lift axis J4. Thus, the holder axis J3 is arranged in parallel to the first bobbin support axis J1 and the second bobbin support axis J2 even when the lift axis J4 tilts relative to the second bobbin support axis J2. Since the tilting of the lift axis J4 relative to the vertical axis J5 is maintained, the second angle is maintained at an angle greater than 0°. When the second angle is maintained in this manner, the holder axis J3 and the first bobbin support axis J1 are arranged coaxially. The holder axis J3 and the first bobbin support axis J1 are arranged coaxially so that the bobbin holder 23 can hold the bobbin 30 supported with the first bobbin support axis J1 at the center of the bobbin 30 in the bobbin support member 22.
The following will describes the bobbin replacement operation using the bobbin replacement apparatus 20 having the above-described configuration. In each spindle of the pot spinning machine 10, the bobbin 30 supported by the bobbin support member 22 is inserted into the pot where a yarn is wound on the bobbin 30 by moving the bobbin support member 22 upward by the lifter device 38. The bobbin replacement apparatus 20 starts the following operations before the winding of yarn on the bobbin 30 in the pot is completed.

(Step 1)

Empty bobbins 30 are transported to the positions corresponding to each spindle by the bobbin transport member 21. Each empty bobbin 30 is mounted on the peg 31a of the peg tray 31 when being transported. The second bobbin support axis J2 of the bobbin transport member 21 is disposed coaxially with the holder axis J3 of the bobbin holder 23. Thus, the empty bobbin 30 is disposed right blow the bobbin holder 23.

(Step 2)

Then, pantograph mechanism 25 moves the doffing bar 24 downward. At this stage, the lift axis J4 of the pantograph mechanism 25 is disposed in parallel to the second bobbin support axis J2. Thus, the doffing bar 24 moves downward straight along the second bobbin support axis J2 together with the bobbin holder 23.

(Step 3)

The bobbin holder 23 holds the empty bobbin 30 transported by the bobbin transport member 21 in the above-described manner.

(Step 4)

Subsequently, the pantograph mechanism 25 moves the doffing bar 24 upward. Thus, the bobbin holder 23 moves upward with the doffing bar 24 while holding the empty bobbin 30. As a result, the empty bobbin 30 is pulled out from the peg tray 31 of the bobbin transport member 21.

(Step 5)

The bobbin transport member 21 moves the positions of the peg trays 31 by the half pitch Pb (FIG. 5) in one of the directions along the spinning machine longitudinal direction X. Thus, the intermediate peg 33 is arranged right below the bobbin holder 23.

(Step 6)

After the doffing bar 24 is moved downward by the pantograph mechanism 25, the holding of the bobbin 30 by the bobbin holder 23 is released. The empty bobbin 30 is thus mounted on the intermediate peg 33.

(Step 7)

After the doffing bar 24 is moved upward by the pantograph mechanism 25, the bobbin transport member 21 moves the positions of the peg tray 31 by the half pitch Pb (FIG. 5) in the other direction along the spinning machine longitudinal direction X. Accordingly, the peg 31a of the peg tray 31 is arranged right below the bobbin holder 23. If the winding of yarn on the bobbin 30 is not completed in the pot, the bobbin replacement apparatus 20 stands by until the winding of yarn on the bobbin 30 is completed.

(Step 8)

Once the winding of the yarn on the bobbin 30 in the pot is completed, the lifter device 38 moves the bobbin support member 22 downward. As a result, the full bobbin 30 having completed the winding of yarn is removed from the pot.

(Step 9)

Subsequently, the entire pantograph mechanism 25 tilts relative to the second bobbin support axis J2 by the first tilting operation of the tilting mechanism 26. Tilting the pantograph mechanism 25, the contact portion 71 of the movable member 63 hits the stopper 75, which rotates the movable member 63 about the pin 66a of the hinge 66 by the reaction force generated by hitting the stopper 75 with the contact portion 71 of the movable member 63. The rotational movement of the movable member 63 causes the hook portion 68 to move away from the protruded portion 65, and the tip of the adjustment screw 69 hits the protruded portion 65. As a result, the angle between the holder axis J3 and the lift axis J4 is maintained at the second angle. In addition, the holder axis J3 of the bobbin holder 23 is disposed coaxially with the first bobbin support axis J1 of the bobbin support member 22.

(Step 10)

Then, the lifter device 38 moves the bobbin support member 22 upward, and the bobbin holder 23 holds the full bobbin 30.

(Step 11)

After the lifter device 38 moves the bobbin support member 22 downward, the tilting of the pantograph mechanism 25 relative to the second bobbin support axis J2 is released by the second tilting movement of the tilting mechanism 26. Thus, the lift axis J4 of the pantograph mechanism 25 and the second bobbin support axis J2 are arranged in parallel. The contact portion 71 of the movable member 63 moves away from the stopper 75. Receiving the rotational force generated by the weight of the bobbin holder 23 and the doffing bar 24, the movable member 63 rotates about pin 66a of the hinge 66. Thus, the angle between the holder axis J3 and the lift axis J4 is maintained at the first angle. In addition, the holder axis J3 of the bobbin holder 23 is arranged coaxially with the second bobbin support axis J2 of the bobbin transport member 21.

(Step 12)

The pantograph mechanism 25 moves the doffing bar 24 downward, and the holding of the bobbin 30 by the bobbin holder 23 is released. Accordingly, the full bobbin 30 is mounted on the peg tray 31 of the bobbin transport member 21.

(Step 13)

Thus, after the pantograph mechanism 25 moves the doffing bar 24 upward, the bobbin transport member 21 moves the position of the peg tray 31 by the half pitch Pb in the one of the directions along the spinning machine longitudinal direction X, which positions the intermediate pegs 33 right below the bobbin holder 23. At this stage, the empty bobbin 30 is mounted on the intermediate pegs 33.

(Step 14)

After the pantograph mechanism 25 moves the doffing bar 24 downwards, the bobbin holder 23 holds the empty bobbin 30 mounted on the intermediate peg 33.

(Step 15)

After the pantograph mechanism 25 moves the doffing bar 24 upward, the entire pantograph mechanism 25 tilts relative to the second bobbin support axis J2 by the first tilting movement of the tilting mechanism 26. This maintains the angle between the holder axis J3 and the lift axis J4 at the second angle. In addition, the holder axis J3 of the bobbin holder 23 is arranged coaxially with the first bobbin support axis J1 of the bobbin support member 22.

(Step 16)

After the lifter device 38 moves the bobbin support member 22 upward, the bobbin holder 23 releases the holding of the bobbins 30. Thus, the empty bobbin 30 is mounted on the support pin 37 of the bobbin support member 22.

(Step 17)

Then, after the lifter device 38 moves the bobbin support member 22 downward, the tilting of the pantograph mechanism 25 relative to the second bobbin support axis J2 is released by the second tilting movement of the tilting mechanism 26. This maintains the angle between the holder axis J3 and the lift axis J4 at the first angle. In addition, the holder axis J3 of the bobbin holder 23 is disposed coaxially with the second bobbin support axis J2 of the bobbin transport member 21.
According to the above-described operations of the bobbin replacement apparatus 20, the bobbin 30 supported by the bobbin support member 22 is replaced from the full bobbin to the empty bobbin.
It is noted that the above-described operations of the bobbin replacement apparatus 20 is executed by a controller (not shown), which collectively controls the operations of the pot spinning machine 10 and the bobbin replacement apparatus 20, by controlling the operation of the bobbin transport member 21, the bobbin support member 22, the bobbin holder 23 the pantograph mechanism 25, and the tilting mechanism 26.
In the above-described Steps, the empty bobbin 30 to be transported by the bobbin transport member 21 may be transported with such empty bobbin 30 mounted on the intermediate peg 33. In this case, Steps 2 through 7 are omitted. In addition, the peg 31a of the peg tray 31 and the intermediate pegs 33 are mutually replaceable.

(Effects of the present embodiment)

In the present embodiment of the present disclosure, the second bobbin support axis J2 of the bobbin transport member 21 and the first bobbin support axis J1 of the bobbin support member 22 are set at positions shifted from each other in the horizontal direction. In addition, when the lift axis J4 of the pantograph mechanism 25 and the second bobbin support axis J2 are arranged in parallel, the support mechanism 27 maintains the angle between the holder axis J3 and the lift axis J4 at the first angle, and the holder axis J3 and the second bobbin support axis J2 are coaxially disposed. When the lift axis J4 of the pantograph mechanism 25 is tilted relative to the second bobbin support axis J2 by the tilting mechanism 26, the angle between the holder axis J3 and the lift axis J4 is maintained at the second angle that is greater than the first angle, and the holder axis J3 and the first bobbin support axis J1 are arranged coaxially. Accordingly, the bobbin 30 supported by the bobbin transport member 21 and the bobbin 30 supported by the bobbin support member 22 are held by their associated bobbin holders 23, even the positions of the first bobbin support axis J1 and the second bobbin support axis J2 are shifted in the horizontal direction during the bobbin replacement by the bobbin replacement apparatus 20. As compared with the case where the first bobbin support axis J1 and the second bobbin support axis J2 are arranged coaxially at vertically different positions, the height of the frame 11 of the pot spinning machine 10 may be reduced. Thus, the frame 11 of the pot spinning machine 10 and hence the height of the pot spinning machine 10 may be reduced without tilting the bobbin support axes J1, J2 relative to the vertical axis J5.
In the present embodiment of the present disclosure, the support mechanism 27 includes the fixed member 62 that is fixed to the pantograph mechanism 25 and the movable member 63 that is mounted to the fixed member 62, and has the configuration in which the bobbin holder 23 is mounted to the movable member 63 via the doffing bar 24. This enables to change the position of the bobbin holder 23 by using the movement of the movable member 63 relative to the fixed member 62 with a simple structure.
In the present embodiment of the present disclosure, the contact portion 71 is formed in the movable member 63 and the stopper 75 is formed in the frame 11 so as to correspond to the contact portion 71. When the tilting mechanism 26 tilts the pantograph mechanism 25, the angle between the holder axis J3 and the lift axis J4 is maintained at the second angle by the contact portion 71 in contact with the stopper 75. Thus, the angle between the holder axis J3 and the lift axis J4 may be maintained at the second angle by changing the position of the bobbin holder 23 utilizing the movement of the tilting mechanism 26 without providing an additional driving system.
In addition, according to the present embodiment of the present disclosure, the bobbin replacement apparatus 20 is configured to maintain the angle between the holder axis J3 and the lift axis J4 at the first angle by the weight of the bobbin holder 23 and the doffing bar 24. Thus, fewer parts are needed for the support mechanism 27.
According to the present embodiment of the present disclosure, the bobbin replacement apparatus 20 includes the hook portion 68 that adjusts the position change amount of the bobbin holder 23 by the position changing mechanism 61. As a result, the angle between the holder axis J3 and the lift axis J4 may be set at a desired angle precisely when the tilting mechanism 26 tilts the pantograph mechanism 25.

(Modifications)

The technical scope of the present disclosure is not limited to the above-described embodiment. The embodiment of the present disclosure may be modified and improved in various manners and intends to includes any modified embodiment within the scope that provides specific effects offered by the configurations of the present disclosure and the combination thereof.
Although the angle between the holder axis J3 and the lift axis J4 is maintained at the first angle only by the weight of the bobbin holder 23 and the doffing bar 24 in the above-described embodiment, the present disclosure is not limited to this configuration. For example, as shown in FIG. 13, the bobbin replacement apparatus 20 includes a spring member 77 as an elastic member at a position where the fixed member 62 faces the movable member 63, the first angle may be maintained by an elastic force (spring force) of the spring member 77. However, the elastic member is not limited to the spring member, but may be a rubber member having the great flexibility. Moreover, as shown in FIG. 14, the bobbin replacement apparatus 20 may include a magnet 78a in the protruded portion 65 of the fixed member 62 and a magnet 78b in the hook portion 68 of the movable member 63 so as to maintain the first angle by the magnetic force between the two magnets 78a, 78b. One of the two magnets 78a, 78b may be replaced with a metal piece to be attracted to the magnet. If the configuration that maintains the angle between the holder axis J3 and the lift axis J4 at the first angle by the elastic force or the magnetic force is employed, the vibration of the doffing bar 24 and the bobbin holder 23 may be suppressed during the lift movement caused by the pantograph mechanism 25 and the tilting movement caused by the tilting mechanism 26
The position changing mechanism 61 need not necessarily be formed by using the hinge 66 in the above-described embodiment, but may be provided by any members that can changes the position of the bobbin holder 23 so as to change the angle between the holder axis J3 and the lift axis J4. For example, the position changing mechanism 61 may be provided by a link mechanism 80 shown in FIG. 15. The link mechanism 80 includes an upper link 81 and a lower link 82. One end of the upper link 81 is connected to the fixed member 62 by a pin 83 and the other end of the upper link 81 is connected to the movable member 63 by a pin 84. One end of the lower link 82 is connected to the fixed member 62 by a pin 85 and the other end of the lower link 82 is connected to the movable member 63 by a pin 86. In this link mechanism 80, as shown in FIG. 15, the holder axis J3 of the bobbin holder 23 is arranged extending vertically when the lift axis J4 of the pantograph mechanism 25 is arranged extending vertically. As shown in FIG. 16, when the lift axis J4 of the pantograph mechanism 25 is arranged in a tilted position, the holder axis J3 of the bobbin holder 23 extends vertically due to the change of the position of the bobbin holder 23 with the movement of the link mechanism 80.
Although the pantograph mechanism 25 is used as an example of the lifting mechanism in the present embodiment, any mechanism that can move the doffing bar 24 upward and downward may be used as the lifting mechanism.
Although a pot spinning machine has been described as an example of the spinning machine to which the present disclosure may be applied in the above-described embodiment, the present disclosure is not limited to the pot spinning machine, but is applicable to a ring spinning machine. In a case where the present disclosure is applied to a ring spinning machine, a spindle (not shown) is provided in the bobbin support member, instead of the bobbin rail 36. Since the pot spinning machines need to secure a space for disposing cylindrical members such as a pot and a space for the operations to insert the bobbins into the pot and removed therefrom, the dimension in height of the pot spinning machines tends to becomes large, as compared with the ring spinning machines. Therefore, it offers more significant effect that restricts the height of the spinning machine when the present disclosure is applied to the pot spinning machine.
A bobbin replacement apparatus (20) of a spinning machine includes a first bobbin support axis (J1) extending in parallel to a vertical axis (J5), a second bobbin support axis (J2) that is disposed at a position shifted from the first bobbin support axis (J1) in a horizontal direction, a holder axis (J3),and a lift axis (J4). When the lift axis (J4) and the second bobbin support axis (J2) are disposed in parallel, the angle between the holder axis (J3) and the lift axis (J4) is maintained at a first angle. When the lift axis (J4) of the lifting mechanism (25) is tilted by the tilting mechanism (26), the angle between the holder axis (J3) and the lift axis (J4) is maintained at a second angle, and the holder axis (J3) and the second bobbin support axis (J2) are disposed coaxially.

Claims

A bobbin replacement apparatus (20) of a spinning machine (10), the bobbin replacement apparatus (20) comprising:
a bobbin support member (22) that supports a bobbin (30) with a first bobbin support axis (J1) extending in parallel to a vertical axis (J5) arranged at a center of the bobbin (30);

a bobbin transport member (21) that supports the bobbin (30) with a second bobbin support axis (J2) that is disposed at a position shifted from the first bobbin support axis (J1) in a horizontal direction and arranged at the center of the bobbin (30);

a bobbin holder (23) that holds the bobbin (30) with a holder axis (J3) arranged at the center of the bobbin (30);

a doffing bar (24) that supports the bobbin holder (23);

a lifting mechanism (25) that moves the doffing bar (24) upward and downward in a direction parallel to a lift axis (J4); and

a tilting mechanism (26) that tilts the entire lifting mechanism (25) relative to the vertical axis (J5), characterized in that

a support mechanism (27) supporting the bobbin holder (23) via the doffing bar (24) is provided between the lifting mechanism (25) and the doffing bar (24),

the support mechanism (27) includes a position changing mechanism (61) that changes a position of the bobbin holder (23) so that an angle between the holder axis (J3) and the lift axis (J4) is set at least two different angles, the support mechanism (27) maintaining the angle between the holder axis (J3) and the lift axis (J4) at a first angle when the lift axis (J4) is arranged in parallel to the second bobbin support axis (J2), and the support mechanism (27) maintaining the angle between the holder axis (J3) and the lift axis (J4) at a second angle that is greater than the first angle when the lift axis (J4) of the lifting mechanism (25) is tilted relative to the second bobbin support axis (J2) by the tilting mechanism (26),

the holder axis (J3) and the second bobbin support axis (J2) are disposed coaxially when the support mechanism (27) maintains the angle between the holder axis (J3) and the lift axis (J4) at the first angle, and the holder axis (J3) and the first bobbin support axis (J1) are disposed coaxially when the support mechanism (27) maintains the angle between the holder axis (J3) and the lift axis (J4) at the second angle.
The bobbin replacement apparatus (20) according to claim 1, characterized in that
the support mechanism (27) includes a fixed member (62) that is fixed to the lifting mechanism (25), and a movable member (63) that is mounted to the fixed member (62), and
the bobbin holder (23) is mounted to the movable member (63) via the doffing bar (24).
The bobbin replacement apparatus (20) according to claim 2, characterized in that
the bobbin replacement apparatus (20) further comprises a contact portion (71) formed in the movable member (63), and a stopper (75) fixed to a frame (11) of the spinning machine (10) so as to correspond the contact portion (71), and
the support mechanism (27) maintains the angle between the holder axis (J3) and the lift axis (J4) at the second angle with the contact portion (71) in contact with the stopper (75) when the lift axis (J4) of the lifting mechanism (25) is tilted relative to the second bobbin support axis (J2) by the tilting mechanism (26).
The bobbin replacement apparatus (20) according to any one of claims 1 through 3, characterized in that
the support mechanism (27) maintains the angle between the holder axis (J3) and the lift axis (J4) at the first angle by weight of the bobbin holder (23) and the doffing bar (24).
The bobbin replacement apparatus (20) according to any one of claims 1 through 3, characterized in that
the support mechanism (27) maintains the angle between the holder axis (J3) and the lift axis (J4) at the first angle by an elastic force.
The bobbin replacement apparatus (20) according to any one of claims 1 through 3, characterized in that
the support mechanism (27) maintains the angle between the holder axis (J3) and the lift axis (J4) at the first angle by a magnetic force.
The bobbin replacement apparatus (20) according to any one of claims 1 through 6, characterized in that
the support mechanism (27) includes an adjustment member (69) that adjusts a position change amount of the bobbin holder (23) by the position changing mechanism (61).
The bobbin replacement apparatus (20) according to any one of claims 1 through 7, characterized in that
the spinning machine (10) is a pot spinning machine (10).