JPH09111550A - Cans exchanger of flyer frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cans exchanger capable of carrying out cans exchange action suitable even during operation or stopping of a flyer frame. SOLUTION: A guide roller 85 for guiding a sliver of a feed cans is rotated in the sliver feed direction at a number of revolutions at which the take-in speed is taken into consideration when a feed cans is taken in an exchanger body in cans exchanging action. When the full package followed by the sliver is returned to a feed cans line, a guide roller 85 for guiding the sliver of the full package is rotated to a sliver return direction by number of revolutions at which the return speed and sliver joining speed are taken into consideration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present application relates to a case where a sliver can is fed to a draft part of a spinning machine such as a drawing machine or a roving machine when the remaining amount of the sliver becomes small and the sliver can be fed between the can and the full can. The present invention relates to a can exchange device for performing a can exchange operation including a sliver splicing operation.

[0002]

2. Description of the Related Art As a conventional can changing device, the applicant of the present invention has disclosed Japanese Unexamined Patent Publication No. 6-158453 and Japanese Unexamined Patent Publication No. 6-18.
There are those disclosed in Japanese Patent No. 3646, etc.
Transfer the cans to be exchanged to the main body of the exchange device by moving them in the direction of crossing the cans and taking them into the main body of the exchange machine. A frame and a sliver joint consisting of a plurality of rollers that follow the sliver of the full can to the sliver pulled out from the supply can that has been taken into the main body of the exchange, and can be moved in the can row direction and the can row crossing direction. And a guide roller that is rotatably supported by the tip of the guide rod and that guides the sliver that is pulled out from the can.

The can exchanging operation by the conventional can exchanging device having the above-mentioned structure will be described. In this can exchanging device, the spinning machine to be the target is a roving machine, and the can exchanging operation including the sliver splicing operation with the machine stand operating. The can changing device travels along a full can row and stops at a predetermined can changing position, and at that can changing position, first, a can transfer holding the supply can to be replaced. The frame is moved toward the main body of the exchange device in the direction crossing the cans, and when the supply can is transferred, the guide roller guides the sliver pulled out from the supply can, and when the supply can is taken into the main body of the exchange,
The sliver guided by the guide roller is located at a position corresponding to the sliver joint.

Next, after the sliver splicing operation by the sliver splicing part, the can transfer frame holding the spliced can of the sliver and the guide roller for guiding the sliver pulled out from the sliver can are moved in the can row crossing direction. When the full can is transferred to the supply can row, the guide roller is moved in the direction orthogonal to the sliver supply direction and disengages from the sliver. The sliver guided by the guide roller slips on the sliver guide surface of the guide roller when the supply can is taken in and transferred by the above-mentioned can changing device. In addition, the sliver does not move when the cans are sent out and transferred during the can changing operation. Fed one after another to the Rover in rolling, never become slack sliver, suitable cans exchange operation has been performed.

[0005]

By the way, in the can exchanging device having the above-mentioned structure, the target spinning machine is a roving machine and the can is exchanged while the machine base is operating. When the spinning machine to be used as the drawing machine is a spinning machine, the spinning speed is extremely higher than that of the roving machine, so it is necessary to perform the can changing operation with the machine stand stopped. Even when using a roving machine,
When there is a demand to wind the sliver splicing part as a residual roving near the outer circumference of the empty bobbin, it is necessary to perform the can changing operation with the machine base stopped in accordance with the doffing.

However, when the conventional can changing device performs the can changing operation with the machine stand of the spinning machine stopped, in this can changing operation, the sliver joint after the supply can is taken into the main body of the changing device. The sliver pulled out from the can by operation causes slack without being sent to the machine side.Furthermore, slack due to transfer of the sliver to the supply can row of full cans is also aggravated, and the full can is supplied to the can row. However, even if the guide roller moves in the direction orthogonal to the sliver supply direction due to the large slack of the sliver, the sliver does not come off from the sliver, and a suitable can exchange operation cannot be performed.

[0007]

From the above, the purpose of the present application is to
It is an object of the present invention to provide a can exchange device capable of reliably performing a can exchange operation even while the spinning machine is operating or stopped.
, The guide roller has a sliver guide surface capable of holding the sliver, and a variable speed motor for changing the speed of the guide roller and a variable speed motor are considered in consideration of the movement of the guide roller in the cross direction and the sliver joint. And a control device for gear shift control, so that the tension of the sliver pulled out from the can during the can changing operation is actively controlled. When moving each can in the can row crossing direction during the can change operation, rotate the guide roller at a rotation speed that considers the moving speed of the guide roller in the can row cross direction and the sliver joint speed, and replace the can while the machine is stopped. When taking in the supply cans during operation into the main body of the exchange, use a rotation speed that takes into account the drawing speed of the guide rollers in the direction in which the cans intersect. The id roller is rotated in the sliver feed direction, and at the time of feeding the full can to the feed can row, the guide roller is rotated in the sliver return direction at a rotation speed that considers the feed speed of the guide roller in the can row crossing direction and the sliver joint speed. According to a third aspect of the present invention, the sliver guide surface is formed of a rubber material having a high friction coefficient. Further, in the fourth aspect, the sliver guide surface holds the sliver. It is characterized in that it is formed in a shape that allows it.

[0008]

1 and 2, four rows of supply cans, rows A to D, are arranged on a roving creel 2A along the length of a roving machine 2. In the direction orthogonal to the longitudinal direction of the roving machine 2, the cans 5A to 5D of the supply can rows A to D are linearly arranged. A conveyor 6 including a large number of rotatably supported conveyor rollers 6a is arranged between the rows B and C. The upper surface formed by the conveyor 6 and the floor surface on which the supply can rows 5A to 5D are placed are formed on the same surface. Further, the full cans 5X transferred onto the conveyor 6 are arranged side by side in the direction of the cans by one can with respect to the cans of the cans A to D. When replacing the supply cans row C, the full cans row X is shifted to the upper side in FIG. 1, and when the supply cans row C is replaced, the full cans row X is shifted to the lower side in FIG.

Between the supply can rows A to D, four rows of taper setup are provided so that the rows do not simultaneously issue sliver connection requests. Further, as will be described in the operation described later, the can replacement is performed only on the supply can rows A and B, and the supply can between the supply can rows A and B or between the supply can rows C and D is manually performed. The replacement of the can position shall be carried out.

On the roving creel 2A, as shown in FIG.
A feed roller 10 is provided above the supply can rows A to D in parallel along the longitudinal direction of the machine base. Further, feed rollers 10 are arranged in parallel above the conveyor 6, respectively. As shown in FIG. 7, each feed roller 10 is positively rotated by the rotation of the main motor 12 of the roving frame 2 transmitted through an appropriate transmission means 11, and the cans 5A to 5D.
Of the draft sliver S1 of each rafting machine 2
The sliver S1 is supplied one by one.

With respect to the supply can row B, the can exchanging device 8 shown by an imaginary line in FIG. 1 moves along the full can row X from the lower side to the upper side in the figure, but the supply can row C
In contrast, since the direction of 180 degrees is changed from the imaginary line in FIG. 1 and the full cans row X is moved from the upper side to the lower side in the drawing, it is orthogonal to the traveling rail 24 in the direction along the roving frame 2. A traveling rail 71 is also provided in the direction, and a turntable 70 for changing the direction of the can changing device 8 by 90 degrees or 180 degrees is provided at the intersection thereof.

Next, the can changing device 8 will be described.
The can exchange device 8 has a can take-in position P1 in the lower half of FIG. 1, and a full can take-in position P2 in the upper half, inside the exchange main body 20.
Is set. The distance between the two positions P1 and P2 is set exactly to the diameter of the can. On the side opposite to the roving frame of the exchange device body 20, a portion 20A facing the can take-in position P1 is opened so that the can can pass from the side, and both sides in the longitudinal direction of the machine stand can pass the can. The passage 21 has a bottomless shape with an open bottom. The main body 20 travels along the conveyor 6 over the full cans 5X placed on the conveyor 6 and can be stopped at a predetermined can replacement position Z so that a traveling motor 22 ( The traveling wheels 23 rotated by (shown in FIG. 2) travel on the rails 24.

Further, as shown in FIG. 7, the exchange device main body 2
At 0, the can transfer frame 26 having a suction cup 26a capable of holding the outer circumference of the can is movable in a can row crossing direction intersecting (here, orthogonal to) the can row by a known telescopic mechanism (not shown). It is provided in. This can transfer frame 26 has a supply can 5 to be replaced in the first half of the can replacement operation, as will be described later.
B is moved from the supply can position P3 (shown in FIG. 1) belonging to the supply can row B to the can take-in position P1 by moving in the can row crossing direction, and in the latter half of the can exchange operation, The full can 5X after the sliver connection that has been moved to the insertion position P1 is supplied to the empty supply can position P3 by taking out the supply can 5B.

Further, as shown in FIG. 7, the exchange device main body 2
0, a new sliver between the apron roller 27 and the outlet nozzle 28, which outputs the end of the new sliver S2 of the full can 5X and transfers it to the apron roller 27 that is positively rotated by a pair of openable and closable motors (not shown). Edge S
An opening / closing gripper 29 for cutting the second roller 2, a first roller group 30 rotatably supported by the main body 20 in a stationary state,
On the other hand, the sliver joint portion 32 composed of the second roller group 31 that is pressed and separated, and the new sliver S2 sandwiched by the apron roller 27 are supplied to the joint portion 32 to replace the new and old sliver S1 and S2. After that, a cutting piece 33 for sandwiching and cutting the old sliver S1 with one of the apron rollers 27 is provided.

As shown in FIG. 6, the first roller group 30 includes
Two rollers 35 positively rotated by a motor (not shown),
36 and an apron roller 37. Each roller 35-37 is normally rotated at a feed rate that matches the sliver feed rate, while roller 35 is at the feed rate and
It is possible to shift between two draft speeds. The second roller group 31 is in pressure contact with the two driven rollers 38, 39 and the apron 37a of the apron roller 37, so that the apron 37a
Axial direction (direction orthogonal to the paper surface) while being driven by
In addition, it is composed of kneading rollers 40 and 41 which reciprocate by a motor (not shown), and a trumpet 42 which is open on one side.

The exchange device body 20 is further provided with a horizontal swing arm 60 as shown in FIG. The horizontal swing arm 60 is provided on the main body 20 corresponding to the full-can take-in position P2.
It is provided on the side of. Base end 60 of horizontal swing arm 60
A is horizontally rotatably supported by the main body, is connected to the output shaft of a drive motor (not shown), and a push roller 61 is rotatably supported at the tip of the horizontal swing arm 60. Therefore, as will be described later in action, when the horizontal swing arm 60 in the standby state shown by the dotted line in FIG. 3 is horizontally swung by the action of the drive motor, the push roller 61 at the tip thereof pushes the full-pitch take-in position P2. The full cans 5X are extruded to the can take-in position P1, and the supply cans 5B located at the can take-in position P1 are pushed out along with the extruding of the full cans 5X.
Are discharged to the outside of the exchange device body 20.

Next, the sliver guide mechanism 75 will be described with reference to FIGS. As shown in FIG. 4, the sliver guide mechanism 75 is provided above the main body 20 in the opening 20.
It is provided at a position corresponding to A. A pair of guide rods 77 are attached between the left and right brackets 76 integrally attached to the main body 20, and a first rodless cylinder 78 is supported on the guide rods 77 so as to be laterally movable in the can row direction. . This first rodless cylinder 7
8 is screwed into a ball screw 79 rotatably supported between the left and right brackets 76, and the first rodless cylinder 78 moves in the can row direction by rotationally driving the ball screw 79 by the action of a drive motor 80. It is supposed to do. A second rodless cylinder 81 is attached to the slider 78a of the first rodless cylinder 78. The slider 81 of the second rodless cylinder 81 is attached to the slider 78a.
A guide rod 82 is attached to a. A guide roller 85 which is positively speed-change driven via a motor housing 83 is attached to the tip of the guide rod 82.

When the exchanging device main body 20 is located at the can exchanging position Z and the can exchanging operation is about to be performed, the guide roller 85 causes the supply can 5 to be exchanged.
It is located at the standby position Q1 which is slightly out of phase with the sliver S1 pulled out from B in the direction of the can row, and when the first and second rodless cylinders 78, 81 are caused to project from this state, the guide roller 85 Is a rear position Q which is behind the sliver S1 without interfering with the sliver S1
Located in 2. After that, the ball screw 79 is rotated by the action of the drive motor 80 to move the guide roller 85 to the sliver S1.
When the first and second rodless cylinders 78 and 81 are retracted from this state, the guide roller 85 hooks the sliver S1 and guides it toward the inside of the exchange device main body. When the guide roller 85 moves and is located at the joint position Q4, the sliver S1 guided by the guide roller 85 is positioned between the first and second roller groups 30 and 31 in the separated state ( (Indicated by the solid arrow in FIG. 4). When the sliver joining operation is completed by the sliver joining section 32, the guide roller 85 guiding the sliver at the joining position Q4.
Moves to the facing position Q3 in the direction of the supply can row B to remove the guide of the sliver, and then moves to the rear position Q.
After moving laterally to 2, it is returned to the standby position Q1 again to prepare for the next can replacement operation (shown by the dotted arrow in FIG. 4).

Next, as shown in FIG. 5, a rotary shaft 85a of a guide roller 85 is rotatably supported by a support bracket 87 provided in the motor housing 83 at the tip of the guide rod 82 via a bearing 88. ing. Further, in the motor housing 83, a variable speed motor 91 that is gear-shift controlled by the operation of a control device 100 described later is mounted. A drive pulley 92 is fixed to a drive shaft 91a of the variable speed motor 91. The drive pulley 92 and the rotary shaft 9 are fixed to each other.
The belt 9 is provided between the driven pulley 93 and the driven pulley 93.
4 are wound. In addition, the guide roller 85
A fitting step portion 96 is formed on the outer periphery of the fitting step portion 96.
A fitting member 97 made of silicon rubber is fitted to the.
The outer peripheral surface of the fitting member 97 serves as a sliver guide surface 98 having a high friction coefficient, and when the sliver is guided by the guide roller 85, the sliver is held on the sliver guide surface 98 without slipping. Becomes

Next, the control device 100 for controlling the shift of the variable speed motor 91 will be described. This control device 10
When the feeding can 5B (5C) is taken in and transferred while the roving frame is stopped, the guide roller 85 rotates the guide roller 85 in the sliver feed direction at the rotation speed N ₁ shown by the following equation, and N ₁ = V ₁ / π * d ... ... V _1: uptake transport speed of the guide rollers in the stopping Rover (Figure 4) d: the guide rollers of the sliver guide surface diameter (FIG. 5), when outgoing transfer of full can 5X in Rover stopped, the guide rollers 85 is rotated in the sliver returning direction at a rotation speed N ₂ represented by the following equation. N ₂ > (v ₀ −V ₂ ) / π * d ... v ₀ : Sliver splicing speed when the roving frame is stopped (Fig. 6) V ₂ : Guide roller feed-out transfer speed when the roving frame is stopped (Fig. 4)

Further, the control device 100 causes the guide roller 85 to rotate in the sliver feed direction at the rotation speed N ₃ shown by the following equation when the feeding can 5B (5C) is taken in and transferred during the operation of the roving frame, and N ₃ = (V + V ₃ ) / π * d ... v: sliver splicing speed during operation of the roving machine (matches sliver feeding speed by the feed roller 10 to the roving machine)
(Figure 6) V _3: uptake transport speed of the guide rollers Rover in operation (Fig. 4) Also, at the time of outgoing transfer of supply cans in a roving frame during operation, the sliver at a rotational speed N ₄ showing a guide roller 85 by the following equation It is designed to rotate in the feed direction. , N ₄ = (v−V ₄ ) / π * d ... V ₄ : Delivery speed of guide roller during roving machine operation (Fig. 4)

Next, the can exchange operation by the can exchange device 8 configured as described above will be described. The can exchange operation is performed with the roving frame 2 stopped. Prior to the can exchanging operation of the supply can row B, the full cans 5X are provided on the conveyor 6 in the same number as the supply cans 5B of the B row by shifting one can from the head of the row B by one can (FIG. 1). . At this time, the tips of the new sliver S2 hanging down from the outer circumference of the full can 5X are aligned in a fixed direction suitable for sliver splicing.

When the supply can 5B in the B-row becomes nearly empty, the roving frame 2 stops and outputs a can replacement request, and the request causes the can replacement switch 8 to start moving along the full-ensus can X and the leading cans. 5X is taken into the full-can take-in position P2 of the main body 20, and the supply can 5B to be replaced is stopped at the can exchange position Z, which faces the can take-in position P1 of the main body 20 (FIGS. 1 and 7). At this time, the guide roller 85
The sliver S1 pulled out from the supply can 5B to be replaced is located at a standby position Q1 slightly out of phase with the sliver S1 and the can transfer frame 26 faces the supply can 5B to be replaced. Has become.

From the above state, as shown by the arrow in FIG.
Supply the can transfer frame 26 in the direction crossing the can lines 5B
The feed can 5B to be replaced is held, and the guide roller 85 is moved to the facing position Q3 facing the sliver S1. Then, the can transfer frame 26 is moved toward the exchange main body 20 in the can row crossing direction, and the guide roller 85 located at the facing position Q3 is controlled by the control device 100 at the rotation speed N ₁ (the above formula) in the sliver feed direction. It is transferred toward the exchange device main body 20 in the cross direction of the can rows while being rotated. Then, the guide roller 85 immediately follows the movement of the supply can 5B.
From the sliver S pulled out from the feed roller 10
1 and hook this sliver S1 to the feed roller 10
Guide while sending to the side.

Then, as shown in FIG.
When B is transferred to the can take-in position P1 in the exchange device main body 20 and the guide roller 85 moves to the joint position Q4, the sliver S1 guided by the guide roller 85 is separated from the sliver joint portion 32 at this time. First of the state
It is located between the roller group 30 and the second roller group 31.
Next, the outlet nozzle 28 sucks the new sliver S2 of the full can 5X by air suction, and the outlet nozzle 28
Is moved upward (indicated by an arrow in FIG. 8) and introduced between the open apron roller 27 and the gripper 29 to close them, and the apron roller 27 is reversed to rotate the new sliver between the apron roller 27 and the gripper 29. Cut the end of S2. On the other hand, in parallel with this, the second roller group 31 is pressed against the first roller group 30, and at this time, the first roller group 30 is positively rotated (FIG. 9).

Next, the apron roller 27 sandwiching the new sliver S2 moves to the imaginary line position in FIG.
The tip of the new sliver S2 is fed toward the nip point by. As a result, the new sliver S2 is superposed on the old sliver S1, and the tip of the new sliver S2 is attached to the rollers 35 and
When the roller 35 is positioned at an appropriate position between
Then, the draft is doubled between the rollers 35 and 36 by setting it to / 2. Then, the thickness of the new and old slivers S1 and S2 becomes the original thickness and is fed to the trumpet 42 and converged there. Thereafter, the kneading rollers 40 and 41 are axially moved to rub the overlapping sliver. The new and old slivers S1 and S2 are completely joined, and the succeeding transfer is completed. With such a sliver splicing operation, the sliver is sequentially sent out from the sliver splicing part 32 toward the guide roller 85, but the operation of the roving frame 2 is stopped and the sliver is fed to the roving frame 2 side by the feed roller 10. Therefore, the sliver is slackened between the sliver joint portion 32 and the guide roller 85.

Thereafter, as shown in FIG. 10, the apron roller 2 is
One of the cutting pieces 3 opens toward the cutting piece 33, and the cutting piece 3 cuts the old sliver S1 located outside the apron roller 27.
Hold between 3 and. The old sliver S1 is pulled and cut by the rotation of the roller 35, and the cut end has rollers 35, 3
At the stage of reaching the middle of 6, the rotation of the roller 35 is returned to the original,
The draft ratio is "1". Then, each element is returned to the original position shown in FIG. 11, and the drive motor 64 is operated to swing the horizontal swing arm 60 from the storage position Q1 (shown by the arrow in FIG. 3). As a result, the push roller 61 at the tip of the horizontal swing arm 60 pushes the outer circumference of the full can 5X, and transfers the full can 5X from the full can take-in position P2 to the can take-in position P1. When the full can 5X is transferred, it is pushed by the full can 5X and the supply can 5B located at the can take-in position P1 is pushed and discharged to the outside of the main body 20.

Next, as shown by the arrow in FIG. 11, the can transfer frame 26 holds the full can 5X at the can take-in position P1 and transfers it to the supply can position P3 in this holding state, and at the joining position. The guide roller 85, which guides the sliver S2 pulled out from the full can 5X at Q4, is rotated in the sliver feed direction at the number of revolutions N ₂ (the above formula) by the control of the control device 100 toward the supply can row B. To transfer. During the transfer of the guide roller 85, the guide roller 85 guides the sliver S2 while feeding it back to the can side. Then, the guide roller 85 deviates from the guide of the sliver S2 immediately before reaching the facing position Q3, and after reaching the facing position Q3, moves as shown by an arrow in FIG. When the can exchanging operation including the sliver splicing operation for one can is completed in this way, the can exchanging machine 8 moves upward by one can and stops in FIG. Thereafter, this operation is repeated, and the can replacement work for the plurality of cans 5B in the row B is performed.

As described above, in the can changing device 8 of this embodiment, when the supply can 5B is taken in and transferred, the guide roller 85 is positively rotated at the rotation speed N ₁ in consideration of the take-in speed V ₁ . Since the sliver S1 is sent out in the feed direction, the sliver S1 will not be stretched. Also, when sending out 5X full cans,
Since the guide roller 85 is positively rotated at the number of revolutions N ₂ in consideration of the feed speed V ₂ and the sliver joint speed v ₀ of the sliver joint portion 32, the slack generated in the sliver joint operation is absorbed and a full can There is no slack in the 5X feed transfer.

In the above embodiment, the case of exchanging the cans while the roving frame 2 is stopped has been described. However, when the cans are exchanged during the operation of the roving frame 2 by the setup change,
When the supply can 5B (5C) is pulled in, the guide roller 85 is rotated at the rotation speed N ₃ (the above formula), and when the full can 5X is sent out, the guide roller 85 is rotated at the rotation speed N ₄
By rotating the sliver by the above formula, tension and slack of the sliver caused by the pull-in and feed-out movements of the guide roller 85 are positively adjusted. Further, in the above embodiment, the fitting member 9 forming the sliver guide surface 98 of the guide roller 85.
Although 7 is made of silicone rubber, it may be made of NBR rubber, and the sliver guide surface 98 may be formed by providing a plurality of protrusions and grooves (for example, knurls) capable of holding the sliver.

[0031]

As described above, in the can changing device for a spinning machine of the present application, the guide roller has the sliver guide surface capable of holding the sliver, the variable speed motor for rotating the guide roller at variable speed, and the variable speed motor. Is equipped with a control device that controls the shift in consideration of the movement of the guide roller in the direction crossing the cans and the splicing of the sliver so as to positively control the tension of the sliver pulled out from the can during the can replacement operation. With this configuration, even when the roving frame is in operation or stopped, the guide roller is speed-changed at a rotation speed corresponding to the movement of the can to positively prevent the sliver from being loosened by the guide roller. Can be adjusted.

[Brief description of the drawings]

FIG. 1 is an overall plan view of a roving creel.

FIG. 2 is a II view of FIG.

FIG. 3 is a plan view of the can changer and is an explanatory view of a horizontal swing arm.

FIG. 4 is a plan view of the can changer and is an explanatory view of a sliver guide mechanism.

FIG. 5 is a sectional view of a motor housing.

FIG. 6 is an explanatory diagram of a sliver joint portion.

FIG. 7 is an operation explanatory view.

FIG. 8 is an operation explanatory view.

FIG. 9 is an operation explanatory view.

FIG. 10 is an operation explanatory view.

FIG. 11 is an operation explanatory view.

FIG. 12 is an operation explanatory view.

[Explanation of symbols]

2 roving machine, 2b draft section, 5A to 5D supply can, 5X full can, 8 can exchange device, 2
0 exchange device main body, 85 guide roller, 91 variable speed motor, 98 sliver guide surface, 100 control device

Claims (4)

[Claims] 1. A replacement full cans row is prepared in parallel with a supply cans row consisting of a large number of cans supplying a sliver to a draft section of a spinning machine, and a predetermined row is run along the full cans row. At the can exchange position, and at that can exchange position, the supply cans to be exchanged are moved in the cans row crossing direction that intersects the cans row and taken into the exchange device main body, and the sliver pulled out from this supply can After connecting the sliver of the full can, moving the full can of the sliver in the can row crossing direction and sending it to the supply can row, the can exchange operation is performed, and in the can exchange direction of each can in this can exchange operation. In synchronization with the movement of the can, the can interlacing of the spinning machine is provided with a guide roller which moves in the direction crossing the can rows while guiding the sliver pulled out from the can. In the conversion device, the guide roller has a sliver guide surface capable of holding a sliver, and a variable speed motor for changing the speed of the guide roller and a variable speed motor for moving the guide roller in a direction crossing the can row and for sliver. A can changing device for a spinning machine, which is provided with a control device that controls gear shifting in consideration of splicing, and positively controls the tension of the sliver pulled out from the can during the can changing operation. 2. When the cans are moved in the cans row intersecting direction in the cans exchanging operation during machine stand operation, the guide rollers are rotated at a rotation speed that takes into account the moving speed of the guide rollers in the cans row intersecting direction and the sliver joint speed. When the supply can is taken into the main body of the exchange during the can exchange operation while the machine is stopped, the guide roller is rotated in the sliver feed direction at a rotation speed that takes into account the drawing speed of the guide roller in the direction in which the cans intersect. When the full cans are fed to the can row, the guide roller is rotated in the sliver return direction at a rotation speed that takes into account the feed speed of the guide roller in the can row cross direction and the sliver joint speed. The can changing device for a spinning machine according to claim 1. 3. The can changing device for a spinning machine according to claim 1, wherein the sliver guide surface is made of a rubber material having a high friction coefficient. 4. The can changer for a spinning machine according to claim 1, wherein the sliver guide surface is formed in a shape capable of holding the sliver.