JP3976753B2 - Warp knitting machine - Google Patents

Description

  The present invention is a warp knitting machine including at least one pattern guide bar having a plurality of yarn guides, and the yarn guide can be reciprocated in a displacement direction by a drive device. The yarn guide, the drive device, The present invention relates to a warp knitting machine in which tension elements are arranged between the two.

  This type of warp knitting machine is known from US Pat. In this type of warp knitting machine, the yarn guide is hung on the wire or wire rope which is the tension element, and both ends of the wire or wire rope are connected to the tightening element via the tightening belt. The same force is applied to the end of the. Therefore, the drive motor in which the tightening belt is wound around the drive gear of the drive shaft only needs to apply the drive force necessary for the movement of the yarn guide. Thus, the drive motor need not provide the drive force necessary to tighten the spring or other tightening device. In this case, the tightening device is configured as an air cylinder that maintains the tightening force by the pressure of air.

In such a warp knitting machine, for example, the supply of compressed air supplied to the air cylinder may be interrupted during assembly or during operation. When the warp knitting machine is transported from the manufacturer to the customer, the compressed air is not supplied to the warp knitting machine. In this state, the tensile elements are unable to maintain their position due to lack of lateral stiffness. For this reason, there is a risk that the tensile elements fall from a predetermined position and become entangled with each other. In order to prevent this, a considerable extra expense is required before the start of operation. At the time of shipment, the tension elements are broken apart and must be reset in place before resuming operation. In addition, when the thread guide is replaced with a bar unit in another mounting position, the tension element may be tangled and damaged.
German Patent Application Publication No. 10137601

  The subject of this invention is providing the warp knitting machine which can suppress the influence of an above-described obstacle small.

The problem is that in a warp knitting machine of the type pointed out at the beginning, a holding device acting on the tension element is provided , and the holding portion of the holding device receives a pretension in one holding direction by the pretension applying means and A tension element can be held, and the holding device releases the tension element by driving the holding portion in a direction opposite to the one holding direction against the pretension. This is solved by having a tightening drive (e.g. a drive cylinder) that can be used.

  When a situation occurs in which the clamping force acting on the tension element becomes too small or disappears, the holding device is activated. The holding device then holds the tension element or elements firmly in place. Even when gravity acts on the tension element, the tension element does not fall from that position. Therefore, operation restart can be easily performed. When restarting the operation, it is only necessary to release the holding of the holding device. The release of the holding device in this way is performed after the required clamping force (tensile force) or the clamping pressure has again increased to the desired state in order to hold the tension element under tension. When the tension element is tightened in this way, it no longer falls from the predetermined position.

  Preferably, the holding device is configured as a tightening device. Such a configuration is one of the particularly simple forms of the holding device. In such a configuration, the tension element is simply clamped by the holding device. The friction force generated at that time is sufficient to hold the tension element in place.

  Preferably, the tension element is configured in a belt shape at least in a region where the holding device is provided. Such a belt-like configuration has the advantage of having two substantially parallel flat surfaces. In particular, when the holding device is configured as a tightening device as described above, a simple holding form is possible. All that is required is to tighten the belt-shaped members with sufficient force to produce the desired friction joint.

  Preferably, a plurality of tension elements are provided and the holding device is configured to act on a group of tension elements simultaneously. That is, in such a configuration, it is not necessary to provide a unique holding device for each tension element. That is, the tension elements can be grouped into groups and one common holding device can be used for multiple tension elements. If comprised in this way, attachment space (arrangement space) will be saved and control will become easy. In other words, it is only necessary to assume that only one holding device is used for all the tensile elements at the same time for at least one group of all the tensile elements.

  At that time, a configuration in which a plurality of tensile elements overlap to form a group of tensile elements is preferable. Such a configuration is particularly advantageous when the tensioning device is configured in a belt shape in the region where the holding device is provided. In that case, the individual belt-like tension elements can be pressed against each other. The belt-like tension elements are reliably held in their position if they can be pressed with sufficient force, although they do not have to be excessive.

In this case, it is preferable that the guide device is arranged in a region where the holding device is provided, and that the guide device is configured to guide the tension element in parallel with the moving direction of the holding device. On the other hand, when the holding device is configured as a tightening device, for example, the guide device restrains the belt-like tension element so that it cannot be avoided laterally when it is pressed against each other. Next, the holding device together with the guiding device ensures that the belt-like tension elements remain in their position during operation of the holding process.
Preferably, the holding device acts on a plurality of groups of tension elements at the same time and each group of these tension elements is configured to be at the same height. For example, two or three pulling elements can be juxtaposed and arranged such that they can be biased by the same holding device. This further saves space. Assuming that the warp knitting machine has a large number of tension elements, for example 64 tension elements and a corresponding number of yarn guide groups, each of which eight tension elements are arranged as a group, When the two groups are juxtaposed, it is only necessary to provide four holding devices. The 16 tension elements of both groups (2 groups) juxtaposed can be biased by one holding device.

  Preferably, the holding device is pre-tensioned in one holding direction and has a tightening drive device. In such a configuration, the holding device automatically operates when the auxiliary energy, eg compressed air or current, is lost or the compressed air or current is reduced so that they can no longer maintain the holding force of the holding device. To do. That is, when the above-described failure occurs, it is not necessary to take other measures to operate the holding device. When the auxiliary energy is lost, the tension element automatically holds the tension element firmly.

  In this case, it is preferable that the holding device has a compression spring. A compression spring is a simple part of the structure. During operation, that is, when there is no obstacle, the compression spring is in a state where the spring force is not applied (killed state) by, for example, compressed air or magnetic force. When the auxiliary energy is lost and therefore the spring force of the compression spring is no longer in effect (killed state), this spring force causes the tension element to be held firmly by the holding device.

As a preferred form, the holding device has a displaceable (for example, telescopic) head portion, and this head portion acts on the tension element in cooperation with a cradle (also called anvil). . This head part can be moved by, for example, a compression spring. However, other drive devices can naturally be employed instead of the compression springs. When the head portion moves toward the cradle, the head portion can tighten and hold the tension element between the head portion and the cradle.
At that time, it is preferable that the head portion has a deformable front surface (contact surface or pressing surface). In that case, the deformable front face conforms to the contour of the tension element or elements and holds the tension element or elements firmly. The deformable head portion can also compensate for small elevation differences occurring between groups of adjacent tension elements, thus holding multiple groups of tension elements firmly with one holding device.

  Preferably, the head part is formed from a polymer. Polymers, ie polymeric plastics, have the advantage of being inexpensive. That is, if it is inexpensive, the head part can be a worn part that is sometimes replaced. In addition, this polymer, that is, a polymer plastic, is sufficiently flexible (elastic) to absorb the surface difference when the tensile element is biased.

  One particularly preferable form is that the cradle is configured to move toward the head portion. In such a configuration, not only the head portion but also the cradle moves. Tightening between the head part and the cradle thus secures (secures) a structure in which the tension element or elements do not “strike” too strongly. That is, the load on the tension element can be kept small.

  In that case, it is preferable that a stopper is provided as a cradle stroke limiting means. That is, the cradle can move only to a predetermined position. This position is selected such that the tension element has an optimal transition. Especially when the tension element is short, the “it” of the tension element is kept within limits.

  In this case, it is preferable that the cradle has a driving device that is stronger than the driving device of the head unit. This can be achieved, for example, by the following: the head is moved by a drive element having, for example, one compression spring while the cradle is biased by a drive element having two similar compression springs, This can be realized by a configuration in which the drive element of the base has a total of two compression springs. The position of the cradle is determined by the stopper, and it is thus ensured that this position (position for tightening the tension element) does not change due to the force of the head portion.

Preferably, one end of the tension element is connected to the driving device, and the other end of the tension element is connected to the tightening device via a turning roll, the turning roll has a circumferential groove, and the circumferential groove is In other words, at least the lower end thereof is covered with a stationary holding element in the direction of gravity. That is, in this configuration, the tension element is not clamped between the two clamping devices, but is only fixed between the driving device at one end and the clamping device at the other end. When the clamping device loses its clamping force, the tension element is firmly held by the holding device on the side of the drive. On the other hand, the tension element is held by a turning roll at the other end, and therefore no holding is required at this other end. Such a retention mechanism is relatively simple in design. A tensioning element whose end can be configured, for example, as a wire rope, in this case simply holds the wire rope firmly in the groove of the turning roll and cannot escape from it.
In that case, it is preferable that a plurality of turning rolls are juxtaposed, and the gap between adjacent turning rolls is smaller than the minimum cross-sectional dimension of the tensile element in (present) the gap area. In this case, since the guide groove of the turning roll is covered by the adjacent turning roll, the tensile element cannot escape from the turning roll to the outer diameter side. Only the outermost turning roll requires a separate covering member for covering the guide groove of the turning roll.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

  A warp knitting machine in which a main part of the present invention, a part of which is omitted in FIG. 1, includes a pattern guide bar 1, and the pattern guide bar 1 includes a yarn guide 2. A warp knitting machine is usually provided with a plurality of pattern guide bars 1. Each pattern guide bar 1 usually has a plurality of yarn guides 2. However, although the figure showing the warp knitting machine shown in FIG. 1 is omitted, the figure showing the warp knitting machine shown in FIG. 1 is useful for a simple explanation of the embodiment of the present invention.

  The yarn guide 2 is fixed to a wire rope 3. When the wire rope 3 reciprocates, the yarn guide 2 similarly reciprocates in the displacement direction. The displacement direction is a direction extending in parallel with the longitudinal direction of the wire rope 3.

  At one end (right end in FIG. 1), the wire rope 3 is guided to the tightening device 5 via the turning roll 4 and is connected to the tightening device 5. The tightening device 5 generates a constant tightening force on the wire rope 3 that is not affected by the stroke length. For this purpose, the fastening device 5 can be configured as a compressed air cylinder, for example.

  At the other end (the left end in FIG. 1), the wire rope 3 is connected to the tightening belt 6 via a detachable connector 7. The tightening belt 6 is wound around a drum 8, and the drum 8 is disposed on the output shaft 9 of the transmission 10. A motor 11 is disposed on the input side of the transmission device 10. The motor 11 is an electric motor, and may preferably be a servo electric motor, a permanent magnet excitation synchronous motor, or a stepping motor. Any type of motor that can be controlled to rotate at a small angle (rotation angle) can be basically used as the motor 11. An electronic control unit necessary for controlling the motor 11 is not shown. The motor 11 and the transmission device 10 together with the drum 8 form a drive device 21.

  The wire rope 3 together with the tightening belt 6 forms a tension element 12. The tension element 12 is kept in a tightened state by a predetermined tightening force by the tightening device 5 during operation. The motor 11 operates against the tightening force of the tightening device 5. With such a configuration, even when the transmission device 10 has a gap inside, the transmission device 10 can be used. In other words, the clearance of the transmission device 10 is always reduced (compensated) by the tightening force of the tightening device 5 regardless of the operating direction of the tension element 12 (rightward operation or leftward operation).

  There is a possibility that a failure (failure) may occur during operation and even at the start of operation. For example, when the supply of compressed air to the tightening device 5 is stopped, the tightening state of the tension element 12 is weakened, and the tension element 12 may be changed from the illustrated position.

In order to eliminate such a situation, a holding device 13 that operates in the event of a failure is provided. The holding device 13 has a cradle (anvil) 14 and a head portion 15 that form a holding portion for holding the tension element 12 , and the head portion 15 holds the cradle 14 when the tension element 12 is held. Collaborate with. In this embodiment, the head portion 15 is made of a polymer plastic. That is, the head portion 15 has flexibility (elasticity) within a certain range. For example, a guide device 16 in the form of a fork having two protrusions (prongs) 17 and 18 is fixed to the cradle 14, and the prongs 17 and 18 are parallel to the operation direction of the head portion 15. It extends.

The head portion 15 is driven (displaced) via a push rod 19 by a drive cylinder 20 (one embodiment of a tightening drive device ). Although not shown in detail, a compression spring (one embodiment of the pretensioning means) is disposed in the drive cylinder 20, and when the external force does not act (in a free state), the compression spring receives the head portion 15. 14 in the direction approaching. However, the push rod 19 is moved away from the cradle 14 by the drive cylinder 20 by auxiliary energy, for example, compressed air during operation, so that the head portion 15 has a sufficient distance from the cradle 14 and the tightening belt 6 Can move freely with respect to the cradle 14 (and the head portion 15). When the supply of compressed air supplied to the warp knitting machine is interrupted, not only the action of the tightening device 5 is weakened, but also the compression spring arranged in the drive cylinder 20 is no longer compressed and held, and this compression The spring moves (displaces) the push rod 19 in the direction of the receiving portion 14 of the head portion 15, and fixes the tightening belt 6 between the head portion 15 and the receiving portion 14. At that time, the guide device 16 prevents the tightening belt 6 from escaping sideways.

Of course, the drive cylinder 20 and the pretension applying means may be in other forms. For example, a magnetic connector may be provided between the cradle 14 and the head portion 15 as the pretension applying means , and the head portion 15 may be attracted in a direction approaching the cradle 14 by a magnetic force. Good. In this case, the reaction force generated by the compressed air (reaction force against the magnetic force generated by the magnetic connector) can be increased in the drive cylinder 20 as described above. This reaction force can be increased in other ways, for example, also by magnetic force. In addition, the drive cylinder 20 can overcome the reaction force formed by the spring in order to hold the head portion 15 at a sufficient distance from the cradle 14 during operation without any trouble in place of the drive cylinder. It can also be configured as an electric linear motor.
In the above-described configuration, when a failure occurs and the tightening device 5 can no longer perform its function, the holding device 13 is activated, and the head portion 15 and the cradle 14 itself. The tightening belt 6 is tightened between the two. This effectively prevents the tensioning device 12 from being entangled with another tensioning device 12 not shown in detail.

  Next, FIG. 2 shows a comparison between an operation state without trouble when a plurality of tension elements 12 are used and an operation state when a failure occurs. In FIG. 2, the same members as those in the embodiment shown in FIG.

  Each tensioning element 12 is provided with a unique clamping device 5 at one end and a unique driving device at the other end, but only the drum 8 constituting the driving device 21 among the driving devices 21 is this. This is illustrated in FIG. The holding device 13 is not activated in FIG. Therefore, in a state where the head portion 15 has a sufficient distance from the cradle 14 and the tightening force between the driving device 21 at one end of the tension element 12 and the tightening device 5 at the other end of the tension element 12 is acting. The guide 2 can reciprocate in the displacement direction by the driving device 21.

  When the tightening force applied by the tightening device 5 is weakened, there is a risk that the individual tension elements 12 may be entangled with each other. This is because, for example, the tension elements 12 fall from their predetermined positions due to the absence of the clamping force. However, such a fall is prevented by the holding device 13 shown in its operating state in FIG. That is, the head portion 15 moves in a direction approaching the cradle 14, and then the tension element 12, more precisely, the belt-like portion (tightening belt 6) of the tension element 12, the head portion 15 and the cradle. Fasten with 14 and fix. At that time, the guide device 16 prevents the pulling element 12 from avoiding in the lateral direction (the depth in the drawing or the front side in FIG. 2). In other words, the holding device 13 acts (fixes) on a plurality of tension elements 12 simultaneously in the illustrated example of six tension elements. As a result, the tension elements 12 are not only fixed relative to the warp knitting machine but also relative to each other, so that the tension elements 12 are not entangled with each other.

  Next, FIG. 3 shows an example of an embodiment having two holding devices, of which the holding device 13 is the same as the embodiment of FIGS. The head portion 15 can move toward the stationary cradle 14. The tension element between the cradle 14 and the head part 15 is not shown in FIG.

  Another holding device 23 is arranged on the same support 22 to which the drive cylinder 20 of the holding device 13 is fixed. The holding device 23 has a cradle (anvil) 24, and a head portion 25 that cooperates with the cradle 24 is moved by a drive cylinder 20a. The drive cylinder 20 a is the same as the drive cylinder 20 of the holding device 13.

  The cradle 24 can move toward the head portion 25 via the other two drive cylinders 20b and 20c. At that time, the drive cylinders 20 a, 20 b, and 20 c operate (displace) similarly to the drive cylinder 20 of the holding device 13. However, the cradle 24 can be displaced until it comes into contact with the stopper 26, so that the stopper 26 becomes a limiting means (a limiting member) that determines the stroke length. The stopper 26 is fixed on the support 22.

  By the way, in this embodiment, when the supply of compressed air is interrupted, the drive cylinders 20, 20 a, 20 b, and 20 c are all extended by the compression springs. The cradle 24 moves to the stopper 26 by both the drive cylinders 20b and 20c, that is, in the direction opposite to the head portion 25. At the same time, the head portion 25 moves in a direction approaching the cradle 24, and thus the tension element 12 is clamped between the cradle 24 and the head portion 25. Since the two drive cylinders 20 b and 20 c act on the cradle 24, the force acting on the cradle 24 is stronger than the pressing force acting on the head portion 25. That is, the cradle 24 abuts against the stopper 26, and the cradle 24 can maintain its position even when the head portion 25 is fixed to the cradle 24.

  As can be seen from FIG. 3, the head portion 25 urges two groups of tension elements 12, each group of tension elements 12 having a plurality of overlapping tensioning belts. Both groups are at the same height, ensuring that the tension elements 12 of all groups are securely held. Small irregular irregularities or small steps generated on the surface can be absorbed by the elasticity or flexibility of the head portion 25.

  As an advantage of the cradle 24 operating, the tensioning element 12 will be "fluttered" even weaker than can be seen, for example, in FIG. Thereby, especially when the tension | pulling element 12 is short, a load is restrained small.

  4 to 6 show the state of the other end of the tension element.

  The tension element 12 is guided via the turning roll 4. As can be seen from FIG. 5, each turning roll 4 is held in the support element 27, and each turning roll 4 has a circumferential groove 28. The tension element 12 is guided in the circumferential groove 28. A pin (stationary holding element) 29 is fixed to the support element 27 at the lowest position (bottom) in the direction of gravity. The pin 29 covers the circumferential groove 28 from below so that the tension element 12 does not fall from the circumferential groove 28. Incidentally, the pin 29 is not in contact with the turning roll 4, and therefore, no excessive wear occurs.

  By the way, when the tightening force of the tightening device 5 is weakened, the tension element 12 may surely fall downward due to the action of gravity. However, the separation of the tension element 12 from the circumferential groove 28 of the turning roll 4 is prevented by the pin 29, so that it is impossible to separate downward.

  FIG. 6 shows another configuration. The gap (distance) a between adjacent turning rolls 4 is smaller than the minimum cross-sectional dimension of the tensile element 12 in this region. With this configuration, the tensile element 12 can be firmly held between the turning roll 4 and the turning roll 4 adjacent thereto.

  Only in the outermost turning roll 4a there is no adjacent turning roll to hold the tensioning element 12 firmly. For this reason, the pin 30 which covers the circumferential groove | channel 28 equivalent to the said pin 29 is provided only in this outermost turning roll 4a.

  The configuration of the illustrated embodiment can be modified in many ways. The holding devices 13 and 23 can firmly hold two or more groups of tension elements 12 as shown. The cradles 14 and 24 can be elastically configured to reduce the degree of elasticity or flexibility of the front surfaces of the head portions 15 and 25, and the inaccuracy can be absorbed through the cradles 14 and 24. is there. It is also possible to hold the tension element (tightening belt) firmly with the head portion 25 by operating the cradle 24.

  In order to maintain the gap between the head portions 15 and 25 and the cradle 14 and 24, electric energy can be used instead of compressed air used as auxiliary energy. If the auxiliary energy is not supplied well, the holding devices 13 and 23 are activated anyway.

  The present invention can be used for warp knitting machines and the like.

It is a figure which shows the structure of the outline of the principal part of the warp knitting machine which has one tension | pulling element. It is a figure which shows two states of the outline composition of the principal part of a warp knitting machine which has a plurality of tension elements, and (a) is a figure showing an operation state without a trouble at the time of using a plurality of tension elements. (B) is a figure which shows the driving | running state when a failure generate | occur | produces. It is a perspective view which shows the structure of the outline of the principal part of the warp knitting machine which comprises two holding devices. It is the elements on larger scale of the turning roll part arrange | positioned at the terminal (other end) of a tension | pulling element. FIG. 5 is a cross-sectional view taken along line VV in FIG. 4. FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Pattern guide bar 2 ... Yarn guide 12 ... Tensile elements 23, 13 ... Holding device 21 ... Drive device

Claims (17)

Comprising at least one handle guide bar having a plurality of thread guides, the thread guide being reciprocable in a displacement direction by a drive device, and a tension element being disposed between the thread guide and the drive device ; In a warp knitting machine provided with a holding device having a holding portion capable of holding the tension element ,
The holding portion of the holding device (13, 23) can hold the tension element (12) by receiving a pretension in one holding direction by the pretensioning means, and the holding device (13, 23). A tightening drive device (20, 20a,) capable of driving the holding portion in a direction opposite to the one holding direction against the pretension to release the holding of the tension element (12). A warp knitting machine characterized by having 20b, 20c) .   2. The warp knitting machine according to claim 1, wherein the holding device (13, 23) is configured as a tightening device.   The warp knitting machine according to claim 1 or 2, wherein the tension element (12) is configured in a belt shape at least in a region where the holding device (13, 23) is provided.   The tension element (12) is provided in a plurality, and the holding device (13, 23) acts simultaneously on a group of tension elements (12). Warp knitting machine.   5. The warp knitting machine according to claim 4, wherein the plurality of tension elements (12) overlap to form a group of a plurality of tension elements (12).   A guide device (16) is arranged in a region where the holding device (13) is provided, and this guide device (16) places the tension element (12) in a direction parallel to the operating direction of the holding device (13). The warp knitting machine according to claim 5, wherein the warp knitting machine is guided.   7. A device according to any one of claims 4 to 6, characterized in that the holding device (13, 23) acts simultaneously on a plurality of groups of tension elements (12), each group of these tension elements (12) being of the same height. The warp knitting machine according to claim 1. The warp knitting machine according to any one of claims 1 to 7, wherein the tightening drive device comprises a drive cylinder (20, 20a, 20b, 20c), and the pretension applying means comprises a spring . The warp knitting machine according to claim 1, wherein the holding device (13, 23) has a compression spring as the pretension applying means . The holding device (13, 23) includes a displaceable head portion (15, 25) as the holding portion, and the head portion (15, 25) in cooperation with the head portion (15, 25). The warp knitting machine according to any one of claims 1 to 9 , further comprising a cradle (14, 24 ) for clamping and holding the tension element (12) therebetween .   The warp knitting machine according to claim 10, wherein the head portion (15, 25) has a deformable front surface.   The warp knitting machine according to claim 10 or 11, wherein the head portion (15, 25) is formed of a polymer.   The warp knitting machine according to any one of claims 10 to 12, wherein the cradle (24) is movable toward the head portion (25).   The warp knitting machine according to claim 13, further comprising a stopper (26) as a stroke limiting means for the cradle (24). The cradle (24) has a drive device that can move the cradle (24) toward the head portion (25) with a stronger driving force than the drive device of the head portion (25). The warp knitting machine according to claim 14.   One end of the tension element (12) is connected to the driving device (21), and the other end is connected to the tightening device (5) via the turning roll (4). 28), wherein the circumferential groove (28) is covered at least in the direction of gravity by a stationary holding element (29). Warp knitting machine.   A plurality of turning rolls (4) are juxtaposed and the gap (a) between adjacent turning rolls (4) is more dimensional than the minimum cross-sectional dimension of the tensile element (12) in this gap (a) region The warp knitting machine according to claim 16, wherein the warp knitting machine is small.

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