loom

Abstract

To provide a structure capable of suppressing vibration of a rotary shaft as much as possible in a loom equipped with a rotary shaft which is constructed between a pair of side frames while being supported by a bearing disposed in the individual side frame and is composed of solid shaft-like shaft parts supported by the individual side frame and a hollow pipe-like body part located between the shaft parts.SOLUTION: The loom comprises a bearing structure which is disposed in at least one of two existing areas of solid shaft-like shaft parts constructed between side frames across a hollow pipe-like body part in the axial direction of the rotation shaft and which includes a rolling bearing into which the shaft part is fitted and a support for supporting the rolling bearing.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention provides a rotating shaft supported via bearings provided in each side frame and spanned across a pair of side frames, A hollow pipe-shaped main body portion which is the main body portion, and a solid shaft-shaped shaft portion which is attached to each end of the main body portion and supported by each of the side frames. The present invention relates to a loom having a rotating shaft comprising: [Background technology]

[0002] In a loom, the main shaft, which is a rotating shaft, is mounted on a pair of side frames of the loom frame. The main shaft is supported by each side frame in such a way that, for example, a support shaft supported within the side frame via a bearing protrudes toward the inside of the loom frame, and the main shaft is connected to the support shaft so that it is supported by the side frame via the support shaft and the bearing. Some main shafts are solid in their entirety, but there are also known main shafts in which, for the purpose of reducing weight, the main body portion, which is the main part that occupies the majority of the main shaft, is formed as a hollow pipe-shaped member, and the shaft portions, which are the portions at both ends other than the main body portion, are formed as solid shaft-shaped members.

[0003] In addition to the main shaft as described above, other rotating shafts mounted on the side frames of a loom include, for example, a shedding shaft in a crank-type shedding device, and some shedding shafts are composed of a hollow main body and a solid shaft, like the main shaft described above.

[0004] The configuration of a loom equipped with a rotating shaft such as the main shaft or the shedding shaft is disclosed in, for example, Patent Documents 1 and 2. Patent Document 1 discloses a main shaft equipped in a loom, and the main shaft is supported at both ends by side frames (loom frames). Furthermore, the loom disclosed in Patent Document 1 is equipped with a support device (center support member) that is provided to support the main shaft at its intermediate position as well. The support device includes a bearing, and is configured to support the main shaft via the bearing. Patent Document 2 discloses an shedding shaft equipped in a loom, and the loom disclosed in Patent Document 2 also includes a support device that supports the shedding shaft at its intermediate position, similar to the loom disclosed in Patent Document 1. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2006-291380 A [Patent Document 2] Publication number 7-26374 Summary of the Invention [Problem to be solved by the invention]

[0006] Incidentally, since the above-mentioned bearing device is provided to support the rotating shaft at its intermediate position as described above, when the rotating shaft is configured to include a hollow main body portion as described above, the bearing device is provided to support the main body portion. In this case, since the main body portion is a hollow pipe-shaped member as described above, the bearing device generally employs a plain bearing (bearing metal). In a bearing device using such a plain bearing, there is usually a small gap between the plain bearing and the rotating shaft.

[0007] During operation (weaving) of a loom, the entire loom frame, including the side frames supporting the rotating shaft, vibrates due to beating motion, shedding motion, and the like. The rotating shaft also vibrates due to this vibration. The aforementioned support device is therefore provided for the purpose of suppressing the vibration of the rotating shaft. However, in the support device, a gap exists between the sliding bearing and the rotating shaft as described above, and the rotating shaft will vibrate within the range of this gap.

[0008] In addition, in a loom, a resonance phenomenon occurs in which the rotating shaft resonates in relation to the rotation speed of the loom while it is in operation, which can cause the rotating shaft to vibrate more violently. More specifically, as described above, the loom frame vibrates as a whole while in operation, and the vibration corresponds to the rotation speed of the loom. The resonance phenomenon can occur due to the relationship between the vibration of the loom frame corresponding to the rotation speed and the natural frequency of the rotating shaft system including the part that supports the rotating shaft, causing the rotating shaft to vibrate more violently.

[0009] However, as for the natural frequency of the rotating shaft system, although the bearing is provided at the intermediate position of the rotating shaft as described above, because there is a gap between the bearing and the rotating shaft as described above, the rotating shaft is effectively supported only by the support parts at both ends supported by the side frames. Therefore, the natural frequency of the rotating shaft system including such support parts is not affected by the presence of the bearing (it is the same as when the bearing is not provided).

[0010] In addition to the fact that the rotating shaft vibrates in conjunction with the vibration of the loom frame (side frame) as described above, if the resonance phenomenon occurs, the vibration of the rotating shaft will be amplified and become even more severe, which may result in problems such as damage to the rotating shaft and / or the bearings provided in the side frames to support the rotating shaft.

[0011] In view of the above-mentioned circumstances, an object of the present invention is to provide a configuration for a loom having a rotating shaft composed of a hollow main body and a solid shaft portion as described above, which can minimize vibration of the rotating shaft. [Means for solving the problem]

[0012] The present invention provides a rotating shaft supported via bearings provided in each side frame and spanned across a pair of side frames, A hollow pipe-shaped main body portion which is the main body portion, and a solid shaft-shaped shaft portion which is attached to each end of the main body portion and supported by each of the side frames. The present invention is based on a loom having a rotating shaft comprising:

[0013] In order to achieve the above object, the loom according to the present invention is characterized in that: Both shaft parts The present invention is characterized in that the bearing structure is provided in at least one of the ranges in which the shaft portion is present, and includes a rolling bearing into which the shaft portion is fitted and a support body that supports the rolling bearing. Effect of the Invention

[0014] In the loom of the present invention, the rotating shaft is supported by the side frames at both ends, and also by a bearing structure that employs a rolling bearing fitted onto the solid shaft portion of the rotating shaft (fitted without any gap). Therefore, the rotating shaft system includes the bearing structure. In the present invention, the bearing structure only needs to be fitted onto the shaft portion (provided within the range in which the shaft portion exists), and the position of the bearing structure can be set arbitrarily within the range in which the shaft portion exists. The natural frequency of the rotating shaft system changes depending on the position of the bearing structure. In other words, the natural frequency of the rotating shaft system is determined by the position of the bearing structure.

[0015] In manufacturing and selling a loom, the operating conditions of the loom, including the rotation speed, are generally provided in advance by a user and are known before the loom is designed. Therefore, it is possible to determine the natural frequency at which the resonance phenomenon occurs for the rotating shaft system based on the known operating conditions of the loom. In addition, in the loom of the present invention, since the position of the bearing structure can be set arbitrarily within the range in which the shaft part of the rotating shaft exists as described above, it is possible to set the position of the bearing structure so that the natural frequency of the rotating shaft system does not coincide with the determined natural frequency at which the resonance phenomenon occurs. By setting the position of the bearing structure in this way, it is possible to prevent the resonance phenomenon from occurring during weaving, and to prevent damage to the rotating shaft and the bearings due to the strong vibration of the rotating shaft. [Brief description of the drawings]

[0016] [Figure 1] 1 is a schematic front view of an example of a loom on which the present invention is based. [Diagram 2] FIG. 2 is a front view of a bearing structure showing an example of a bearing structure provided in a loom according to the present invention. [Diagram 3] 3 is a cross-sectional view of the loom shown in FIG. 2 taken along line AA (side view of a bearing structure). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] An embodiment of a loom according to the present invention will be described below with reference to Figs.

[0018] In the loom 1, the frame 2 mainly comprises a pair of side frames 3, 3, which are connected by a number of beams. Each side frame 3 is formed in a box shape with an internal space. The side frames 3, 3 are connected by the above-mentioned number of beams while facing each other in the width direction (the weaving width direction of the loom 1). With regard to the beams, the beam 4 shown in Figs. 1 to 3 is a so-called front top stay, and is provided on the side of the take-up roll (not shown) in the front-rear direction of the loom 1, above the take-up roll in the up-down direction.

[0019] In the loom 1, the main shaft 5 is provided in such a manner that it is suspended between the pair of side frames 3, 3. The main shaft 5 is composed of solid shaft-shaped shaft portions 5a, 5c supported by the side frames 3, and a hollow pipe-shaped main body portion 5b located between the shaft portions 5a, 5c. Thus, the loom 1 includes the main shaft 5 as the rotating shaft referred to in the present invention. In each of the shaft portions 5a, 5c of the main shaft 5, the ends 5a1, 5c1 on the main body portion 5b side are formed to have a flange-shaped portion (flange portion) having a diameter larger than the diameter of the portion other than the ends 5a1, 5c1, in accordance with the outer diameter of the main body portion 5b. The main shaft 5 is provided near the side opposite to the take-up roll side with respect to the front-rear direction, and below the front top stay 4 in the up-down direction.

[0020] In this embodiment, the main shaft 5 is connected to the support shaft 8 supported by each side frame 3 via a coupling member 10, so that the main shaft 5 is suspended between the side frames 3, 3 as described above. Therefore, each side frame 3 is provided with a support shaft 8 at a position that matches the position of the main shaft 5 in the front-rear and up-down directions.

[0021] The support shaft 8 has an axial length longer than the dimension of the side frame 3 in the weaving width direction, and is provided in each side frame 3 so as to protrude from the side frame 3 toward the inside of the loom 1. However, the support shaft 8 is supported by both side walls 3a, 3a of the side frame 3 via bearings 9, and is provided in a state in which it can rotate with respect to the side frame 3.

[0022] Incidentally, the loom 1 is provided with a drive mechanism (not shown) including a prime mover motor as a drive source. The drive mechanism is provided on one of the pair of side frames 3, 3. In this embodiment, the drive mechanism is provided on the right side frame 3 in FIG. 1. A support shaft 8 (one support shaft 8a) supported on the right side frame 3 is connected to the drive mechanism and driven to rotate, thereby driving the main shaft 5 to rotate.

[0023] The loom 1 also includes a beating device 11 including a rocking shaft 13 for rocking the reed 12. The rocking shaft 13 is mounted between both side frames 3, 3, similar to the main shaft 5. The rocking shaft 13 is mounted at approximately the same position as the main shaft 5 in the front-rear direction, and above the main shaft 5 in the up-down direction. Furthermore, while the rocking shaft 13 is mounted between both side frames 3, 3 as described above, it is also supported by a pivot support device 14 at an intermediate position therebetween.

[0024] In the illustrated example, two pivot devices 14 are provided to support the rocking shaft 13 at two points between both ends. Each pivot device 14 is supported by a support plate 15 fixed to the front top stay 4. More specifically, the support plate 15 is fixed to the underside of the front top stay 4 and is provided to extend over substantially the entire length of the front top stay 4 in the weaving width direction and extend from the front top stay 4 to the rocking shaft 13 (main shaft 5) in the front-rear direction. Each pivot device 14 is attached (supported) to the support plate 15 while being placed on the upper surface of the support plate 15.

[0025] In the loom 1 as described above, in the present invention, the loom includes a bearing structure provided in at least one of the ranges of the both shaft portions between the side frames 3, 3 in the axial direction of the rotating shaft. The bearing structure includes a rolling bearing into which the shaft portion of the rotating shaft is fitted, and a support body that supports the rolling bearing. In addition, the bearing structure 20 of this embodiment is provided to support the main shaft 5 which is the rotating shaft. Furthermore, the bearing structure 20 is provided to support a shaft portion (one of the shaft portions) 5a connected to one of the support shafts 8a (support portion 8 on the side frame 3 side of the driving side) of the both shaft portions 5a, 5c of the main shaft 5. The bearing structure 20 of this embodiment will be described in detail below.

[0026] 2 and 3, the bearing structure 20 is made up of a rolling bearing 21 into which the one shaft portion 5a is fitted, and a support body 22 that supports the rolling bearing 21. The support body 22 is made up of a retaining portion 24 that retains the rolling bearing 21, and a support portion 23 for supporting the retaining portion 24 relative to the support plate 15.

[0027] The support 22 has a holding portion 24 that is plate-shaped and has an end surface that is substantially square. However, the holding portion 24 has a through hole 24a that penetrates in the plate thickness direction so that the rolling bearing 21 can be fitted in the plate thickness direction. The support 23 is composed of an attachment portion 23a that is attached to the support plate 15 and an attached portion 23b that is attached to the holding portion 24, and the attachment portion 23a and the attached portion 23b are integrally formed.

[0028] The mounting portion 23a of the support portion 23 is plate-like and formed to have a substantial T-shape when viewed in the plate thickness direction. Specifically, the mounting portion 23a is composed of a base portion 23a1 which is a portion attached to the support plate 15, and an extension portion 23a2 which is a portion provided to extend in a direction perpendicular to the base portion 23a1.

[0029] More specifically, the base 23a1 is formed to have a rectangular parallelepiped shape. However, the four side surfaces of the base 23a1 are rectangular in shape with the long sides being sufficiently longer than the short sides. The base 23a1 has through holes 23d for inserting screw members 26 for attaching the attachment portion 23a (support portion 23) to the support plate 15 at both ends in the direction of the long sides (longitudinal direction) of the base 23a1. Each through hole 23d opens on two parallel side surfaces of the base 23a1 and is formed to penetrate in a direction perpendicular to both side surfaces. One of the two side surfaces where the through hole 23d opens becomes an attachment surface that is in contact with the support plate 15 when the attachment portion 23a (support portion 23) is attached to the support plate 15.

[0030] The extension portion 23a2 is formed to have a rectangular parallelepiped shape similar to the base portion 23a1. The extension portion 23a2 is formed to extend in parallel to the penetration direction of the through hole 23d from the side surface opposite the mounting surface at approximately the center (between the both ends) of the base portion 23a1 in the longitudinal direction. The length of the extension portion 23a2 in the extension direction is such that the sum of the length and the dimension of the base portion 23a1 in the penetration direction of the through hole 23d (extension direction of the extension portion 23a2) is approximately equal to the length of the long side of the side surface of the holding portion 24.

[0031] The attached portion 23b is plate-like and has a rectangular end surface. The attached portion 23b has an end surface parallel to the extending direction of the extending portion 23a2 and parallel to the plate thickness direction of the attaching portion 23a. However, the position of the attached portion 23b in the longitudinal direction is such that the attached portion 23b is present within the range of the extending portion 23a2. Furthermore, the attached portion 23b has approximately the same dimensions as the attaching portion 23a in the extending direction and is formed to exist over the range of the attaching portion 23a. The dimension of the attached portion 23b in the plate thickness direction of the attaching portion 23a is slightly larger than the plate thickness of the holding portion 24. In addition, two through holes 23c, through which screw members 25 for attaching the holding portion 24 are inserted, are formed in the mounting portion 23b at intervals in the extension direction so as to penetrate the mounting portion 23b in the plate thickness direction.

[0032] In the support body 22 consisting of the holding portion 24 and the support portion 23 as described above, the rolling bearing 21 is fitted in the holding portion 24 (through hole 24a). The holding portion 24 is attached to the mounted portion 23b of the support portion 23 in such a manner that the plate thickness direction of the holding portion 24 coincides with the plate thickness direction of the mounting portion 23a of the support portion 23. The mounting is performed by screwing the screw members 25 inserted into the through holes 23c of the mounted portion 23b into the holding portion 24.

[0033] In this state where the retaining portion 24 is attached to the support portion 23 (attached state), the retaining portion 24 is aligned with the attached portion 23b in the extending direction. In this attached state, the inner ring of the rolling bearing 21 fitted in the retaining portion 24 is exposed as a whole (not overlapping with the mounting portion 23a) when viewed in the plate thickness direction of the mounting portion 23a. In other words, in the support portion 23, the dimension of the base portion 23a1 in the extending direction and the position of the attached portion 23b relative to the extending portion 23a2 in the longitudinal direction are such that the exposed state of the inner ring of the rolling bearing 21 can be realized.

[0034] Furthermore, in the attached state, the dimension from the attachment surface at the base 23a1 of the support portion 23 to the center position of the rolling bearing 21 (inner ring) in the extending direction is equal to the distance from the axis of the main shaft 5 installed in the loom 1 to the support plate 15. More specifically, in the loom 1, the main shaft 5 is installed on the side frames 3, 3 while being connected to the support shaft 8 as described above, and its axis is aligned with the axis of the support shaft 8. Therefore, the support portion 23 is formed such that the dimension from the attachment surface to the center position of the rolling bearing 21 in the extending direction is equal to the distance from the axis of the support shaft 8 to the support plate 15 in the up-down direction on the loom 1.

[0035] Then, the one shaft portion 5a of the main shaft 5 is fitted into the rolling bearing 21 fitted into the holding portion 24 of the support body 22 configured as described above. In addition, in a state in which the one shaft portion 5a is fitted into the rolling bearing 21 in this manner, the flange portion 5a1 of the shaft portion 5a and the rolling bearing 21 are in contact with each other.

[0036] Generally, it is said that the larger the diameter of a rolling bearing, the stronger it is against axial and radial loads and the more effective it is at suppressing vibrations of the shaft it supports. Therefore, in this embodiment as well, in order to employ a larger rolling bearing to further suppress vibrations of the main shaft 5, the one shaft portion 5a of the main shaft 5 is formed such that the portion (insertion portion) 5a2 that is inserted into the rolling bearing 21 and adjacent to the flange portion 5a1 has a larger diameter than the diameter of the portion 5a3 on the tip side (the portion connected to the support shaft 8a by the coupling member 10).

[0037] The support body 22 is attached to the lower surface of the support plate 15 at the attachment portion 23a of the support part 23 at a position in the weaving width direction (attachment position) described below. That is, the bearing structure 20 including the support body 22 and the rolling bearing 21 into which the one shaft portion 5a of the main shaft 5 is inserted as described above is attached to the lower surface of the support plate 15 at the attachment position. The attachment is performed by screwing the screw members 26 inserted into the through holes 23d in the base portion 23a1 of the attachment portion 23a into the support plate 15.

[0038] By mounting the bearing structure 20 on the support plate 15 in this manner, the main shaft 5 is supported by the bearing structure 20 at the mounting position. The main shaft 5 is then coupled at each of its shaft portions 5a, 5c to the support shaft 8 supported by each of the side frames 3 as described above via the coupling member 10, and is suspended between the pair of side frames 3, 3. As a result, the main shaft 5 is supported by the side frames 3 at both ends (the ends of each of the shaft portions 5a, 5c), and is also supported by the bearing structure 20 at the fitting portion 5a2 of the one of the shaft portions 5a between the both ends.

[0039] The support position (the mounting position) in the weaving width direction by the bearing structure 20 is set at a position where the natural frequency of the system of the main shaft 5 including the bearing structure 20 is different (does not match) from the natural frequency at which the resonance phenomenon of the main shaft 5 occurs. However, as described above, in this embodiment, the bearing structure 20 is in a state where the rolling bearing 21 abuts against the flange portion 5a1 of the one shaft portion 5a when the one shaft portion 5a of the main shaft 5 is fitted into the rolling bearing 21. Therefore, the mounting position is determined by the axial dimensions of each component part of the main shaft 5 (the main body portion 5b, the shaft portions 5a, 5c, the flange portion 5a1 of the one shaft portion 5a, etc.). Therefore, the main shaft 5 is configured so that the mounting position is at a position where the natural frequency of the system is different from the natural frequency at which the resonance phenomenon occurs.

[0040] Furthermore, in the loom 1 configured so that the main shaft 5 is supported by the bearing structure 20 thus provided, the resonance phenomenon does not occur during weaving, and therefore the main shaft 5 does not vibrate violently due to the resonance phenomenon. This prevents damage to the main shaft 5 or the bearings 9 provided in each side frame 3 for supporting the main shaft 5 due to the violent vibration.

[0041] Since the bearing structure 20 is provided so as to additionally support the main shaft 5 supported at both ends as described above, between the both ends, it not only prevents the occurrence of the resonance phenomenon as described above (prevents the violent vibration of the main shaft 5 caused by the resonance phenomenon), but also exerts an effect of suppressing vibration due to the additional support (vibration suppression effect). In addition, in this embodiment, as described above, the fitting portion 5a2 of the shaft portion 5a fitted into the rolling bearing 21 of the bearing structure 20 is formed to have a larger diameter than the tip portion 5a3, and a bearing with a larger diameter is used as the rolling bearing 21. This configuration thereby provides a greater vibration suppression effect.

[0042] The present invention is not limited to the embodiment described above, but can be embodied in modified forms (variations) such as the following (1) to (6).

[0043] (1) Regarding the support in the bearing structure, in the above embodiment, the support 22 is composed of a plate-shaped holding portion 24 that holds the rolling bearing 21 and a support portion 23 for supporting the plate-shaped holding portion 24 against the support plate 15, and the support portion 23 is composed of an attachment portion 23a and an attached portion 23b. However, in the bearing structure of the present invention, even if the support is composed of a holding portion and a support portion, the support portion is not limited to being configured as in the above embodiment, and may be formed in any shape as long as it can support the holding portion against the support plate 15.

[0044] In the above embodiment, the support body 22 is configured by combining the holding portion 24 and the support portion 23, which are each formed of separate members. However, even when the support body is configured to include a portion corresponding to the holding portion and a portion corresponding to the support portion in this manner, the two are not limited to being formed of separate members, and the holding portion and the support portion may be integrally formed so as to be part of a single member.

[0045] In addition, when the support is configured from a single member in this way, the support can also be configured as a plate material bent into an L-shape, for example. More specifically, the L-shaped plate material can be configured to have a through hole in which the rolling bearing 21 is fitted at a portion on one end side from the bent portion, making the portion on one end side a portion corresponding to the retaining portion, and the portion on the other end side from the bent portion a portion corresponding to the supporting portion attached to the support plate 15, thereby making it possible to use the plate material as the support.

[0046] (2) Regarding the portion of the loom to which the bearing structure is attached, in the above-described embodiment, the support body 22 is attached to the support plate 15 fixed to the front top stay 4, which is one of the beams connecting the pair of side frames 3, 3. However, in the loom of the present invention, the bearing structure is not limited to being attached to the support plate 15 in this manner.

[0047] For example, even if a support plate is attached to the front top stay 4, depending on the extent of the support plate and the position of the bearing structure in the weaving width direction, the bearing structure may be provided in a form directly attached to the front top stay 4. Also, in the case where the loom is configured to include an auxiliary frame that connects multiple beams in the frame, the bearing structure may be provided in a form attached to the auxiliary frame.

[0048] Furthermore, the bearing structure may be provided in a form attached to the side frame 3. In this case, the support body (supporting portion) of the bearing structure has a portion attached to the inner side surface of the side frame 3, and is configured to extend in the weaving width direction to a support position of the main shaft by the bearing structure (a position where the rolling bearing is arranged) while attached to the side frame 3 at that portion.

[0049] (3) Regarding the position of the bearing structure in the weaving width direction, in the above embodiment, the bearing structure 20 is provided to support the main shaft 5 at one of the shaft portions (the shaft portion connected to the support shaft 8a on the side frame 3 on the driving side) 5a of the main shaft 5. That is, the bearing structure is provided to support the rotating shaft at one of the shaft portions of the rotating shaft, that is, the shaft portion on the driving side. However, in the loom of the present invention, the bearing structure is not limited to being provided to support the rotating shaft at the shaft portion on the driving side in this manner, and may be provided to support the rotating shaft at the shaft portion on the side opposite to the driving side. Moreover, the bearing structure is not limited to being provided to support the rotating shaft at only one of the shaft portions of the rotating shaft in this manner, and may be provided to support the rotating shaft at each of the shaft portions.

[0050] In addition, in either case where the bearing structure is arranged to support the rotating shaft by the shaft portion on the side opposite the driving side of the rotating shaft or by both shaft portions, the position of the bearing structure in the weaving width direction relative to the shaft portion is set at a position that satisfies the condition (resonance prevention condition) that the natural frequency of the rotating shaft system including the bearing structure is different from the natural frequency that causes the resonance phenomenon of the rotating shaft.

[0051] In a loom, the pair of side frames on which the rotating shaft is mounted tends to vibrate more strongly on the driving side than on the opposite side. Therefore, the end of the rotating shaft supported by the driving side frame vibrates more strongly. By providing a bearing structure to support at least the driving side of both shaft portions of the rotating shaft, the vibration suppression effect of the bearing structure described above can be achieved, thereby more effectively suppressing the vibration of the rotating shaft.

[0052] (4) Regarding the combined state of the bearing structure and the rotating shaft, in the above embodiment, the bearing structure 20 and the rotating shaft 5 are combined in a state in which the rolling bearing 21 in the bearing structure 20 and the flange portion 5a1 in the shaft portion 5a fitted into the rolling bearing 21 are in contact with each other. However, in the present invention, the combined state of the two is not limited to such a form. That is, the bearing structure and the rotating shaft may be combined such that the rolling bearing and the flange portion of the shaft portion are spaced apart in the weaving width direction (the bearing structure supports the rotating shaft at a position spaced apart from the flange portion of the shaft portion). Furthermore, the bearing structure and the rotating shaft may be combined such that the bearing structure supports the rotating shaft with the flange portion of the shaft portion (the flange portion of the shaft portion is fitted into the rolling bearing).

[0053] As described above, the position of the bearing structure in the weaving width direction is set to a position that satisfies the resonance prevention condition. Factors that determine the natural frequency of the rotating shaft system include the support position of the bearing structure with respect to the rotating shaft (at what position on the rotating shaft the bearing structure supports the rotating shaft) and the weight of the rotating shaft, which is determined by the axial dimensions and diameters of each component part of the rotating shaft (main body part, shaft part), etc. Furthermore, as described above, the resonance phenomenon of the rotating shaft (the natural frequency that generates the resonance phenomenon) is also related to the rotation speed of the loom under the operating conditions desired by the user.

[0054] Therefore, for example, even if the configuration of the main shaft and the support configuration of the main shaft are the same as those in the above embodiment, if the operating conditions of the loom required by the user are significantly different, the position of the bearing structure will be different from that in the above embodiment, and in the present invention, the bearing structure may be provided in such a manner. Furthermore, in the present invention, since the configuration of the rotating shaft itself (such as the dimensional relationship in the axial direction of each component) is not particularly limited, the rotating shaft may be configured to be in the assembled state different from that in the above embodiment while satisfying the resonance prevention conditions.

[0055] In the above embodiment, the shaft portion 5a of the rotating shaft 5 is formed such that the insert portion 5a2, which is inserted into the rolling bearing 21 in the portion excluding the flange portion 5a1, and the portion 5a3 on the tip side thereof have different diameters (the insert portion 5a2 is larger), but the diameters of both portions may be the same. In this case, the portion excluding the flange portion may be formed as a whole to have the same diameter as the insert portion 5a2 in the above embodiment, or may be formed to have the same diameter as the tip side portion 5a3.

[0056] (5) Regarding the loom to which the present invention is applicable, in the above-described embodiment, the loom 1 is configured such that a support shaft 8 is supported on each side frame 3 via bearings 9, 9 in the side frame 3, and a main shaft 5 serving as a rotating shaft is connected to each support shaft 8, so that the main shaft 5 is suspended between the pair of side frames 3, 3. However, the loom to which the present invention is applicable is not limited to a loom configured such that a rotating shaft is suspended between the pair of side frames and indirectly supported by the side frames via a support shaft, and may be a loom configured such that a rotating shaft is directly supported by the side frames and suspended between the pair of side frames.

[0057] (6) Regarding the rotating shaft in the present invention, in the above embodiment, the main shaft 5 is the rotating shaft in the present invention, and the main shaft 5 and the bearing structure 20 are provided so that the shaft portion 5a of the main shaft 5 is fitted into the rolling bearing 21 of the bearing structure 20. However, the present invention is not limited to the main shaft being the rotating shaft, and for example, when the opening device is a crank-type opening device, the opening shaft of the opening device may be the rotating shaft. In that case, the bearing structure may be provided in such a manner that it is attached to, for example, the front bottom stay (a beam provided below the front top stay 4), which is one of a plurality of beams connecting a pair of side frames.

[0058] Furthermore, the present invention is not limited to the embodiments and modifications described above, and various changes can be made without departing from the spirit of the present invention. [Explanation of symbols]

[0059] 1. Loom 2 Frames 3 Side frame 3a side wall 4 Front top stay 5. Main axis (rotation axis) 5a, 5c shaft part 5a1, 5c1 Flange part 5a2 Insert part 5a3 Tip side 5b Main body 8 Support shaft 9. Bearings 10 Coupling member 11 Reed beating device 12 Reed 13 Locking shaft 14 Pivot support device 15 Support Plate 20 Bearing structure 21 Rolling bearings 22 Support 23 Support part 23a Mounting part 23a1 base 23a2 Extension 23b Mounted part 23c through hole 23d through hole 24 Holding part 24a through hole 25 Screw material 26 Screw material

Claims

[Claim 1] A loom having a rotating shaft supported by bearings provided in each side frame and spanned across a pair of the side frames, the rotating shaft comprising a hollow pipe-shaped main body portion which is a main portion, and solid shaft-shaped shaft portions which are attached to both ends of the main body and supported by each of the side frames, The bearing structure is provided in at least one of the ranges in which the shaft portions are present between the side frames in the axial direction of the rotating shaft, the bearing structure including a rolling bearing into which the shaft portions are fitted and a support body that supports the rolling bearing. A loom characterized by:

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