JP3971157B2 - Textile machine yarn feeder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a yarn feeding device in a textile machine such as a knitting machine.
[0002]
[Prior art]
As a textile machine such as a knitting machine, what has conventionally been provided with a plurality of yarn feeding devices spaced apart in the circumferential direction with respect to an annular frame installed around the knitting portion, the yarn feeding device, A holder mounted on the annular frame is provided with a rotary shaft that is rotatable in the vertical direction. A drive pulley and a yarn feeding drum are provided on the rotary shaft, and one drive belt is wound around the drive pulley of each yarn feeding device. At the same time, the drive pulley and the yarn supply drum are rotationally driven by the rotation of the drive belt, and the yarn wound around the rotation of the yarn supply drum is forcibly supplied to the knitting portion.
[0003]
[Problems to be solved by the invention]
In the knitting machine as described above, a plurality of yarn feeding devices are operated as a whole or selectively according to a request from the knitting unit to supply a necessary amount of yarn, but when knitting is interrupted, etc. In response to this, it is necessary to stop the yarn supplying operation, and various means have been conventionally used for this stopping operation.
For example, the means disclosed in Japanese Patent Application Laid-Open No. 57-107367, Japanese Patent No. 3015341, and the like are based on claw coupling or pin coupling between the drive pulley and the rotation shaft or between the rotation shaft and the yarn feeding drum. A clutch device was provided to connect and disconnect the rotation of the drive shaft or yarn feeding drum as necessary.
[0004]
However, the above-described means has a disadvantage that it is necessary to form claws, pins and the like on the clutch plate, the drive pulley, etc., and the structure is complicated and the cost is increased. In addition, since the engagement part such as the clutch pawl has a dense structure, it is difficult to discharge if dust such as fluff enters, and the accumulation of the waste makes power transmission uncertain and lacks reliability. It was happening.
On the other hand, in the technique disclosed in Japanese Patent Application Laid-Open No. 60-215853, the yarn feeding drum is formed into a substantially drum shape (a shape having a central portion in the axial direction as a warp), and in the forced yarn feeding state, the yarn is When the knitting part is interrupted, etc., the yarn is naturally unwound by the fact that the yarn tension is lost. It was wound around the warp portion of the yarn feeding drum without friction, thereby stopping the forced yarn feeding.
[0005]
In this case, although the above-mentioned inconvenience due to the accumulation of yarn waste does not occur, the supply / stop of the yarn is made depending on the frictional force between the yarn supply drum and the yarn. Since it varies depending on the property, it is not always possible to stop the yarn feeding at a fixed timing. Therefore, it is difficult to synchronize the interruption of the knitting unit and the yarn feeding stop, and it is difficult to perform stable operation control.
Japanese Patent Publication No. 63-37019 discloses a method in which the contact length of the yarn with respect to the feed wheel (yarn feeding drum) is changed by a swingable movable guide, and the feed length is increased by increasing the contact length. The yarn is fed by rotating the wheel, and the contact length is shortened to reduce the friction with the feed wheel to stop the yarn feeding. Even in this conventional technology, the feed wheel is used to feed and stop the yarn. This is due to the frictional force between the thread and the yarn and has the same disadvantages as described above.
[0006]
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a yarn feeding device for a textile machine that can stably perform supply / stop switching of yarn with a relatively simple structure. And
[0007]
[Means for Solving the Problems]
The present invention takes the following technical means to achieve the above object.
That is, in the present invention, a plurality of yarn feeding devices 4 are installed at intervals in the circumferential direction with respect to the annular frame 3 installed around the knitting unit 2, and each yarn feeding device 4 is located at the center of the knitting unit 2. In the textile machine configured to be driven to rotate from the main pulley 6 via the drive belt 5, each yarn feeding device 4 includes a pair of guide members 27 and 27 arranged so as to sandwich the drive belt 5, and the drive belt. 5 and a pair of guide members 27, 27 and the guide pulley 26, and the drive belt 5 is brought into contact with and separated from the drive belt 5 by the drive body 16. The drive pulley 19 of the yarn feeding drum 20 provided so as to be possible is provided .
[0008]
In this case, it is possible to easily connect / disconnect power to / from the yarn feeding drum 20 by abutting or separating the driving pulley 19 with respect to the driving belt 5, and the mechanism, compared with the case where a clutch plate or the like is provided. The structure can be simplified, and the supply and stop of the yarn can be switched reliably at a fixed timing, improving stability.
In the above configuration, the drive pulley 19 is provided so as to be swingable via the swing shaft 12 and swings to the swing frame 13 that makes the drive pulley 19 contact and separate from the drive belt 5. It is recommended that it be installed. As a result, the contact / separation operation of the drive pulley 19 can be performed with a simpler mechanism.
[0009]
It is recommended that a brake means 30 for braking the rotation of the drive pulley 19 when the drive pulley 19 is separated from the drive belt 5 is provided. As a result, the rotation due to the inertia of the drive pulley 19 can be stopped immediately, and synchronization with the knitting portion can be further ensured.
Further, it is desirable that a pair of guide rollers 27, 27 disposed so as to sandwich the drive belt 5 is provided in the vicinity of the drive pulley 19. As a result, the position of the drive belt 5 is held substantially constant by the pair of guide members 27, 27, and the movement of the drive belt 5 due to the contact / separation of the drive pulley 19 can be minimized.
[0010]
Therefore, when a plurality of yarn feeders are operated by a single drive belt 5 as shown in an embodiment described later, the drive pulley 19 of one yarn feeder contacts or separates from the drive belt 5. The influence on the positional relationship between the drive pulley 19 and the drive belt 5 of another adjacent yarn feeding device is reduced, and a reliable contact / separation operation of the drive pulley 19 is ensured as a whole.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 4, a knitting machine 1 as a textile machine has an annular frame 3 installed around a knitting portion 2 and a plurality of yarn feeders 4 arranged at intervals on the annular frame 3. Each yarn feeding device 4 is operated in synchronism with the knitting portion 2 by a single drive belt 5 arranged over them. The drive belt 5 is driven to rotate by a main pulley 6 provided at the center of the knitting unit 2.
[0012]
As shown in FIGS. 1 to 3, the yarn feeding device 4 has a main frame 8 formed by bending a plate material, and the main frame 8 sandwiches the annular frame 3 between the clamping plates 9. And is fixed by a fastening bolt 10. The main frame 8 is provided with a vertically swinging shaft 12 rotatably attached to the swinging shaft 12.
The swing frame 13 is made of a plate material bent in a Z shape in a side view and is disposed in the left-right direction. The swing frame 13 is attached to one end of the mounting rod 13A by a fixing screw 13C and extends in the front-rear direction. The holder 13 </ b> B is disposed in a plan view so that the holder 13 </ b> B has an L shape in plan view, and a longitudinal halfway portion of the attachment rod 13 </ b> A is attached to the swing shaft 12 via the attachment 14.
[0013]
The other end of the mounting rod 13A is pivotally connected to a cylinder rod of a driving body 16 made of an air cylinder, and a cylinder tube of the driving body 16 is pivotally connected to the left and right side portions of the main frame 8, The swing frame 13 swings about the swing shaft 12 by the expansion and contraction operation of 16.
A vertical rotating shaft 18 is rotatably attached to the tip of the holder 13B. A driving pulley 19 is rotatably provided at the upper end of the rotating shaft 18, and a yarn feeding drum 20 is provided at the lower end. It is fixed.
[0014]
The drive pulley 19 is a toothed wheel in which concaves and convexes continuous on the outer peripheral surface thereof are formed in the circumferential direction, and a clutch member 22 for connecting and disconnecting power transmission to and from the rotary shaft 18 is connected to the rotary shaft 18 on the upper side thereof. On the other hand, it is provided so that it can slide up and down.
Further, the holder 13B is provided with a guide tool 23 erected upward and a guide wheel 24 provided rotatably on a mounting arm that protrudes forward, and a guide hole of the guide tool 23 is provided. The yarn S guided by the guide wheel 24 is wound around the yarn supplying drum 20.
[0015]
A guide pulley 26 is rotatably provided on one side of the drive pulley 19 via a mounting member 8A that protrudes forward from the main frame 8, and on the other side of the drive pulley 19, the main frame 8 is located on the front side. A pair of front and rear guide rollers (guide members) 27, 27 are rotatably provided in a portion extending in the direction. The drive belt 5 is disposed so as to pass between the pair of guide rollers 27 and 27 and circumscribe the guide pulley 26.
The drive pulley 19 can be brought into and out of contact with the drive belt 5 by the swinging of the swing frame 13 described above, and rotates by receiving power from the drive belt 5 by contacting the drive pulley 19. Then, the yarn supply drum 20 is also rotated by the rotation of the drive pulley 19 via the rotary shaft 18, and the wound yarn S is forcibly supplied to the knitting unit 2.
[0016]
Further, when the knitting in the knitting unit 2 is interrupted and all or a specific yarn feeding device 4 is stopped, the driving body 16 is contracted by an operation signal according to this, and the swing frame 13 is thereby operated. Swings toward the annular frame 3 and the drive pulley 19 is separated from the drive belt 5. Then, power transmission to the yarn feeding drum 20 is cut off, and forced yarn feeding is stopped.
In other words, in the present invention, the drive pulley 19 is provided so as to be able to contact with and separate from the drive belt 5 to control the driving of the yarn feeding drum 20, and when a clutch device such as a claw or a pin is provided. In comparison with this, the structure and mechanism are simplified, and the supply / stop of the yarn can be reliably and stably switched.
[0017]
Further, when a plurality of yarn feeding devices 4 are arranged in an annular shape and driven by a single driving belt 5 as in the present embodiment, the driving pulley 19 of one yarn feeding device 4 is attached to the driving belt 5. If the drive belt 5 moves greatly back and forth (inside / outside) when coming into contact or separated, the positional relationship between the drive pulley 19 and the drive belt 5 of another adjacent yarn feeding device 4 changes. As a result, the gap between the drive pulley 19 and the drive belt 5 at the time of power disconnection becomes too small or widened, and there is a risk that the power connection / disconnection cannot be performed smoothly. Moreover, in order to eliminate this, it is necessary to adjust the expansion / contraction amount of the driving body 16 individually in each yarn supplying device 4.
[0018]
In this respect, in the present invention, since the pair of guide rollers 27 and 27 are provided in the vicinity of the drive pulley 19 so as to sandwich the drive belt 5, even if the drive pulley 19 is brought into contact with or separated from the drive belt 5. The movement of the driving belt 5 can be minimized, and the belt position can be kept substantially constant, so that the above-described problems can be solved.
Since the drive pulley 19 is moved via the swing frame 13, the drive pulley 19 and the drive body 16 can be arranged apart from each other, and the degree of freedom in design is increased. The guide pulley 26, the drive pulley 19, and the guide roller 27 are arranged side by side in the left-right direction (belt 5 longitudinal direction), and the drive body 16 is disposed on the left and right sides of the guide pulley 26. The piping can be performed with less interference with the surroundings, and the adjustment of each wheel 26, 19, 27, the adjustment of the driving body 16, etc. can be easily performed without interfering with each other.
[0019]
The driving body 16 may be disposed on the side of the main frame 8 opposite to the left and right sides (the guide roller 27 side).
The main frame 8 is provided with brake means 30 for braking the rotation of the drive pulley 19 when the drive pulley 19 is separated from the drive belt 5.
The brake means 30 is constructed by providing a brake shoe 32 such as urethane rubber having wear resistance at the tip of a mounting bolt screwed to a fixed bracket 31 on the upper surface of the main frame 8. When the pulley 19 is separated from the drive belt 5, the outer peripheral surface of the clutch member 22 above the drive pulley 19 contacts the brake shoe 32 on the opposite side, thereby reliably braking the rotation of the drive pulley 19 due to inertia. Therefore, the yarn supply by the yarn supply drum 20 is also stopped in synchronization with the knitting unit 2 reliably.
[0020]
Further, it is possible to prevent the yarn feeding drum 20 from rotating due to vibrations from the knitting unit 2 while the yarn feeding is stopped.
The brake shoe 32 may be configured to directly contact the drive pulley 19. In this embodiment, the drive pulley 19 may be fixed to the rotary shaft 18 without the clutch member 22. In this case, a brake receiver that contacts the brake shoe 32 is separately fixed to the drive pulley 19. Also good.
FIG. 5 shows a second embodiment of the present invention. In this embodiment, two drive pulleys 19, 19 are provided on the upper portion of the rotating shaft 18, and the drive belt 5 is provided for each of the drive pulleys 19, 19. Is circumscribed. Corresponding to the drive pulleys 19, 19, the guide pulley 26 and the pair of guide rollers 27, 27 are also provided in the top and bottom two (two pairs).
[0021]
The drive pulleys 19 and 19 are selectively connected to and disconnected from the rotary shaft 18 by the clutch member 22.
Other configurations are the same as those of the first embodiment, and detailed description thereof is omitted to achieve the same operations and effects.
The present invention is not limited to the embodiment described above, and can be appropriately changed in design.
For example, the drive pulley 19 may be configured to abut against or separate from the drive belt 5 by a linear motion rather than a swinging motion. The driving body 16 may employ a hydraulic cylinder, a mechanical cylinder, a solenoid, an electric motor, or the like without using an air cylinder.
[0022]
The pair of guide members 27, 27 can be appropriately changed in design, for example, constituted by a pair of plate members as well as a roller.
The drive pulley 19 and the yarn feeding drum 20 are not limited to be provided on the same axis 18 but may be provided on separate shafts so that both are linked via a gear mechanism, a belt transmission mechanism, or the like.
[0023]
【The invention's effect】
According to the present invention, the supply and stop of the yarn can be switched stably with a simple structure.
[Brief description of the drawings]
FIG. 1 is a plan view of a yarn feeding device according to a first embodiment of the present invention.
FIG. 2 is a side view of the yarn feeding device (in the direction of arrow A in FIG. 1).
FIG. 3 is a rear view of the yarn feeding device (in the direction of arrow B in FIG. 1).
FIG. 4 is an overall plan view of the knitting machine.
FIG. 5 is a rear view of a yarn feeding device according to a second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Knitting machine 4 Yarn feeder 5 Drive belt 12 Oscillation shaft 13 Oscillation frame 19 Drive pulley 20 Yarn supply drum 27 Guide roller 30 Brake means

Claims (3)

A plurality of yarn feeding devices (4) are installed at intervals in the circumferential direction with respect to the annular frame (3) installed around the knitting unit (2), and each yarn feeding device (4) is arranged in the knitting unit (2 ) In a textile machine configured to be forward driven through a drive belt (5) from a central main pulley (6) of
Each yarn feeding device (4) includes a pair of guide members (27, 27) disposed so as to sandwich the drive belt (5), and a guide pulley (contact pulley) disposed so as to contact the drive belt (5). 26) and the pair of guide members (27, 27) and the guide pulley (26), and the drive belt (5) is brought into contact with and separated from the drive belt (5) by the drive body (16). A yarn feeding device for a textile machine comprising a drive pulley (19) of a yarn feeding drum (20) provided in a possible manner .   The drive pulley (19) is swingably provided via a swing shaft (12) and swings so that the drive pulley (19) is brought into contact with and separated from the drive belt (5) by swinging. The yarn feeder for a textile machine according to claim 1, wherein the yarn feeder is attached to a moving frame (13).   The brake means (30) for braking the rotation of the drive pulley (19) when the drive pulley (19) is separated from the drive belt (5) is provided. Yarn feeder for textile machine.

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