Patent Description:
In a loom, a drive mechanism configured to rotationally drive a warp beam includes a gear member such as a pinion gear in mesh with a beam gear of the warp beam, a drive transmission shaft having one end portion to which the gear member is fixed, and a gear train configured to connect the drive transmission shaft and a drive source. Note that, in a general loom, since the drive source is arranged outside the loom frame, the connection of the drive source and the drive transmission shaft by the gear train is also performed outside the loom frame. Therefore, the drive transmission shaft connected to the warp beam (beam gear) via the gear member inside the loom frame extends toward the outside of the loom frame in a form of being inserted in a through-hole formed in a side frame, on a side (drive mechanism-side) on which the drive mechanism is provided, of a pair of side frames of the loom frame.

The drive transmission shaft is supported with respect to the side frame on the drive mechanism-side by a support structure attached to the side frame on the drive mechanism-side. Note that, the support structure includes two bearings (a first bearing and a second bearing) that are provided on the drive transmission shaft for support at an interval in an axis line direction of the drive transmission shaft. The drive transmission shaft is rotatably supported with respect to the support structure in such a form that the two bearings are externally fitted thereto at an interval in the axis line direction. PTL <NUM> also discloses a loom having such a support structure. PTL <NUM> relates to cloth weaving looms and to improvements in side frames for such looms.

In the meantime, according to the loom disclosed in PTL <NUM>, the support structure is configured such that the first bearing and the second bearing are accommodated in a bracket (bearing case) attached to the side frame. That is, the support structure is configured so that the first bearing and the second bearing are accommodated in the common (single) bearing case. Note that, the bearing case has a configuration where a part in which both the bearings are accommodated is formed in a cylindrical shape extending in the axis line direction so that the first bearing and the second bearing are externally fitted to the drive transmission shaft at an interval in the axis line direction as described above, and is attached to the side frame on one end-side of the cylindrical part.

Note that, in a general loom, the loom frame vibrates violently during weaving due to influences of shedding motion of a heddle frame of a shedding device, a beating operation of a beating device, and the like. Therefore, the warp beam supported by the loom frame (side frame) also vibrates violently during weaving. The warp beam vibrates in this way, so that the drive transmission shaft connected to the warp beam (beam gear) via the gear member also vibrates.

As the drive transmission shaft vibrates in this way, the vibration is transmitted to the bearing case in which both the first and second bearings are accommodated, via the first bearing and the second bearing externally fitted to the drive transmission shaft. That is, the bearing case is in a state of receiving, from the bearing, a force in a direction of the vibration. In the support structure of PTL <NUM> where the bearings are accommodated in the bearing case attached to the side frame as described above, a second bearing, which is one of the two bearings, is apart from an attaching position of the bearing to the side frame. Therefore, when the bearing case receives the force due to the vibration from the second bearing, the force and a moment force corresponding to a distance between the attaching position of the bearing case in the axis line direction and the second bearing act on an attaching portion of the bearing case.

In particular, in the support structure of PTL <NUM>, as described above, the part in which the two bearings are accommodated has a (long) cylindrical shape extending in the axis line direction, the first bearing is accommodated on the one end-side (a side attached to the side frame) and the second bearing is accommodated on the other end-side. For this reason, a position of the second bearing is largely spaced from the attaching position in the axis line direction. That is, the support structure has a large distance between the attaching position in the axis line direction and the position of the second bearing. For this reason, the moment force that acts on the attaching portion of the bearing case described above is also a large force due to the large distance. Furthermore, in the support structure, since the two bearings are accommodated by the single bearing case, a force that is caused to act on the bearing case by the first bearing is also applied to the attaching portion, in addition to the force (moment force) by the second bearing as described above.

As the loom frame vibrates violently as described above, such force acts on the attaching portion at an extremely high frequency. For this reason, although the bearing case is fixed at the attaching portion to the side frame by a screw member, there are concerns that wear and the like may occur at the attaching portion, and therefore, an attached state may be loose. If the loom is operated at high speed in a state where the attached state of the bearing case is loose, the bearing case vibrates more violently, and therefore, the bearing case and the screw member may be damaged.

Further, if the attached state of the bearing case becomes loose, an impact due to vibration associated with the same acts on both the bearings, resulting in damage to the bearings and unstable support of the drive transmission shaft. As a result, there may occur a problem that the drive transmission shaft, the gear member configured to connect the drive transmission shaft and the beam gear of the warp beam, and the like are damaged.

Therefore, in order to prevent the respective constitutional components (the bearing case, the drive transmission shaft, both the bearings, the gear member, and the like) of the drive mechanism from being damaged due to vibration of the loom, an object of the present invention is to provide a loom having a support structure for a drive transmission shaft capable of reducing the force, which acts on an attaching portion of a bearing case due to the vibration, as much as possible.

A preamble of the present invention is a loom including a drive transmission shaft connected to a warp beam via a gear member inside a loom frame including a pair of side frames, the drive transmission shaft being inserted in a through-hole formed in the side frame; and a support structure for supporting the drive transmission shaft, the support structure including a first bearing and a second bearing externally fitted to the drive transmission shaft at an interval in an axis line direction.

In addition, in order to achieve the above object, the loom of the preamble of the present invention is characterized in that the support structure includes a first bearing case configured to accommodate therein the first bearing and attached to the side frame inside the loom frame, and a second bearing case configured to accommodate therein the second bearing and attached to the side frame outside the loom frame.

In addition, in the loom of the present invention, the first bearing case and the second bearing case may be attached to the side frame by a common screw member.

According to the present invention, the support structure is configured such that, the first bearing and the second bearing are not accommodated in a common bearing case but are accommodated in the first bearing case and the second bearing case that are provided corresponding to the respective bearings and are respectively attached to the side frame inside and outside the loom frame. Therefore, each bearing case can be configured so that the bearing to be accommodated therein can be arranged at a position closer to the side frame, as compared to a configuration where the two bearings are accommodated spaced in the axis line direction. Each bearing case is configured in this way, so that a distance between an attaching position to the side frame and a position of the bearing becomes small in each bearing case. Therefore, the moment force (more specifically, the moment force that acts on the attaching portion of the bearing case as each bearing case receives a force from the bearing accommodated therein due to the vibration) becomes small.

Moreover, since the support structure is configured so that the bearing case is provided for each bearing, the force that is caused to act on the bearing case by the bearing due to the vibration is also received by the corresponding bearing case for each bearing. Therefore, the force that acts on the attaching portion of each bearing case becomes smaller, as compared to a case where the two bearings are accommodated in a common bearing case.

Therefore, according to the support structure in the present invention, the force that acts on the attaching portion of each bearing case due to the violent vibration of the loom frame during weaving can be made as small as possible, as compared to the configuration of the related art. Thereby, it is possible to suppress wear and the like occurring on the attaching portion, which are caused due to the force acting on the attaching portion of each bearing case, and as a result, it is possible to suppress damage to each constitutional component of the drive mechanism.

Further, in the loom according to the present invention, the support structure is configured such that the first bearing case and the second bearing case are attached to the side frame by the common screw member. Therefore, each bearing case is attached to the side frame more firmly.

Specifically, each bearing case is attached to the side frame by the screw member. At this time, the first bearing case and the second bearing case are attached to the side frame by the common screw member, so that the attached state is such a state that both bearing cases are attached to the side frame in a form of sandwiching the side frame with both the bearing cases. That is, each bearing case is attached to the side frame in a state where a holding force by both the bearing cases generated as a result of tightening the screw member is applied to the side frame.

Thereby, a total frictional force generated between both the bearing cases and the side frame by the holding force becomes a holding force for holding each bearing case. Therefore, according to the configuration, since the holding force of each bearing case is greater than that of a case where each bearing case is individually attached to the side frame, each bearing case is more firmly attached to the side frame. Note that, each bearing case is firmly attached in this way, so that even when a force due to the vibration (the moment force and the force that is caused to act on the bearing case by the bearing) is applied to each bearing case during weaving, the wear and the like are less likely to occur in each bearing case.

Hereinafter, one embodiment of the loom of the present invention will be described with reference to <FIG>.

In a loom <NUM>, a loom frame <NUM> has a pair of side frames <NUM> and <NUM>, as a main body, and both the side frames <NUM> and <NUM> are connected in a state of facing each other in a width direction (thickness direction) by a plurality of beam members <NUM>.

In addition, the loom <NUM> includes a reed 5a and a beating device <NUM> including a mechanism for swinging the reed 5a. The beating device <NUM> includes a locking shaft 5b that is driven to reciprocally rotate, a plurality of sley swords attached to the locking shaft 5b, and a sley which is supported by each sley sword and to which the reed 5a is attached. The locking shaft 5b is supported by both the side frames <NUM> and <NUM> in a form of being bridged between the pair of side frames <NUM> and <NUM>, so that the beating device <NUM> is provided in a form of being supported by the pair of side frames <NUM> and <NUM>.

In addition, the loom <NUM> includes a woven fabric beam <NUM> for winding a woven fabric W woven on a front side in a front-rear direction. As used herein, the front-rear direction is a direction orthogonal to a width direction of the loom <NUM> (a longitudinal direction of the beam member <NUM>), as seen from above. Shaft portions of both ends of the woven fabric beam <NUM> are respectively supported by the side frames <NUM>, so that the woven fabric beam <NUM> is also provided in a form of being supported by the pair of side frames <NUM> and <NUM>.

The loom <NUM> also includes a warp beam <NUM> for delivering a warp T on a rear side in the front-rear direction. Note that, in the loom <NUM>, each side frame <NUM> is provided with a beam support <NUM> for supporting the warp beam <NUM>. Shaft portions of both ends of the warp beam <NUM> are supported by the respective beam supports <NUM>, so that the warp beam <NUM> is provided in a form of being supported by the pair of side frames <NUM> and <NUM> via the pair of beam supports <NUM> and <NUM>.

In the loom <NUM> as described above, each side frame <NUM> has a let-off frame <NUM>, which is a part configured to support the warp beam <NUM> and formed as a separate body from a main body frame <NUM> that is a part configured to support the beating device <NUM> and the woven fabric beam <NUM>. The let-off frame <NUM> is fixed to the main body frame <NUM>, which is a main body part, thereby forming a part of the side frame <NUM>. That is, each side frame <NUM> is constituted by the main body frame <NUM>, which is a main part and is configured to support the beating device <NUM> and the woven fabric beam <NUM>, and the let-off frame <NUM>, which is fixed to the main body frame <NUM> and is configured to support the warp beam <NUM>.

Each side frame <NUM> is more specifically described. As shown in <FIG> and <FIG>, the main body frame <NUM> has a housing shape where an outer surface (outer wall) is opened. Both the side frames <NUM> and <NUM> are connected at the main body frames <NUM> by the beam members <NUM>, as described above. For reference, the connecting position is a total of four places of two positions of upper portions and two positions of lower portions of the main body frame <NUM>. However, the upper connecting positions are two positions, i.e., a position spaced forward from a central portion of the main body frame <NUM> and a position spaced rearward from the central portion in the front-rear direction. In addition, the lower connecting positions are two positions near the central portion.

Further, the main body frame <NUM> is installed on an installation surface (floor surface) <NUM> in a weaving factory or the like, but in the shown example, is installed on the installation surface <NUM> via a raising member <NUM> for adjusting a height position of the main body frame <NUM>. Note that, the raising member <NUM> is a block-shaped member having a substantially cuboid shape, and is attached to a lower surface of the main body frame <NUM> by using a screw member such as a bolt. In addition, the main body frame <NUM> is installed (fixed) with respect to the installation surface <NUM> by fixing the raising member <NUM> to the installation surface <NUM> by an anchor bolt provided in a form of protruding from the installation surface <NUM>.

In addition, the let-off frame <NUM> is a part of the side frame <NUM> configured to support the warp beam <NUM>, and is integrally fixed to the main body frame <NUM> on a rear part-side of the main body frame <NUM>. However, the warp beam <NUM> is in a state of being supported by the beam supports <NUM> on the loom <NUM>, as described above. Therefore, the let-off frame <NUM> is configured to support the beam support <NUM>. Further, in the loom <NUM> of the present embodiment, the let-off frame <NUM> and the beam support <NUM> are integrally molded, and each is a part of a single delivery structure.

As shown in <FIG>, a part (let-off frame part) <NUM> of the delivery structure corresponding to the let-off frame is constituted by a base portion 33b, which is a portion installed (fixed) on the installation surface <NUM>, and a support portion 33a having a substantially housing shape and provided in a form of standing upright on the base portion 33b. Note that, in the shown example, the support portion 33a is formed such that a side surface facing an inside thereof is opened and a reinforcing rib is formed near a central portion in the front-rear direction. Further, the support portion 33a is directly fixed with respect to the installation surface <NUM> on the base portion 33b, but in the fixed state, has such a height dimension that an upper end thereof is located above a lower surface of the main body frame <NUM> installed on the installation surface <NUM> via the raising member <NUM>.

Further, in the delivery structure, a part above the let-off frame part <NUM> is a part (beam support part) <NUM> corresponding to the beam support. The beam support part <NUM> has a support portion 20a having an arc-shaped support surface for receiving a bearing <NUM> fitted to each shaft portion of both ends of the warp beam <NUM>, and a guide portion 20b having an upper surface, which is continuous with the support surface so as to guide the warp beam <NUM>, and extending rearward from the support portion 20a. In addition, the beam support part <NUM> has a clamp lever 20c for holding the warp beam <NUM> received by the support portion 20a. The clamp lever 20c is provided to be rotatable with respect to the support portion 20a, and is fixed to the guide portion 20b by a fixing means 20d such as a bolt so as to hold the warp beam <NUM> (bearing <NUM>) received by the support portion 20a.

The delivery structure is fixed to an inner wall on the rear part-side of the main body frame <NUM>. Specifically, the delivery structure is in a state of being located inside the side frame <NUM> in such arrangement that the guide portion 20b of the beam support part <NUM> is directed rearward and a part thereof overlaps the main body frame <NUM> in the front-rear direction. However, a positional relationship between the delivery structure and the main body frame <NUM> is such that the support surface of the beam support part <NUM> of the delivery structure is located behind a rear end of the main body frame <NUM> (the support portion does not overlap the main body frame <NUM>). Further, the delivery structure is fixed to the main body frame <NUM> at a plurality of places by screw members such as bolts, in a state of being in contact with the inner wall of the main body frame <NUM> on an outer wall of the delivery structure in the above-described positional relationship in the front-rear direction.

Note that, the delivery structure is fixed with respect to the installation surface <NUM> on the base portion 33b of the let-off frame part <NUM> by an anchor bolt provided in a form of protruding from the installation surface <NUM>, in a state of being fixed to the main body frame <NUM> as described above.

The loom <NUM> also includes a drive mechanism <NUM> for rotationally driving the warp beam <NUM> supported by the beam support part <NUM> of the delivery structure. More specifically, as shown in <FIG>, the warp beam <NUM> includes a beam gear <NUM> attached to an outer side of a beam flange <NUM>. The drive mechanism <NUM> includes a delivery motor M as a drive source for rotationally driving the warp beam <NUM>, a pinion gear <NUM> that is a gear member in mesh with the beam gear <NUM> of the warp beam <NUM>, and a drive transmission shaft <NUM> connected to the warp beam <NUM> via the pinion gear <NUM> and having one end portion to which the pinion gear <NUM> is fixed.

Further, as shown in <FIG>, the drive mechanism <NUM> includes a gear train <NUM> for connecting an output shaft of the delivery motor M to the drive transmission shaft <NUM>. In addition, the gear train <NUM> is constituted by a worm wheel 48a fixed to the other end portion of the drive transmission shaft <NUM>, a worm shaft 48c including a worm 48b configured to mesh with the worm wheel 48a, a transmission gear 48d fixed to one end portion of the worm shaft 48c, and a motor gear 48e fixed to an output shaft of the transmission motor M and configured to mesh with the transmission gear 48d.

The gear train <NUM> is accommodated in a gear case <NUM> attached to the main body frame <NUM> (side frame <NUM>). Note that, the gear case <NUM> is provided in a form of being arranged outside the loom frame <NUM>. Therefore, the drive transmission shaft <NUM> is provided in a form of being inserted in the main body frame <NUM>.

Therefore, the main side frame <NUM> is formed with a through-hole 31a in which the drive transmission shaft <NUM> is inserted. As shown in <FIG>, the through-hole 31a is formed at a position overlapping an outer peripheral edge of the beam gear <NUM> of the warp beam <NUM> at a lower portion on a rear part-side of the main body frame <NUM>. Further, the through-hole 31a is formed in a key hole shape, and has a round hole portion 31a1 having a round hole shape and an elongated hole portion 31a2 having an elongated hole shape and formed to be continuous with the round hole portion 31a1. Note that, the elongated hole portion 31a2 is formed to extend in a direction parallel to the front-rear direction on a front side with respect to the round hole portion 31a1. In addition, the elongated hole portion 31a2 is formed at a position where a position of a center line thereof substantially coincides with a position of a center of the round hole portion 31a in an upper and lower direction.

Further, an inner diameter of the round hole portion 31a1 is slightly larger than an outer diameter of the pinion gear <NUM> fixed to the drive transmission shaft <NUM>. On the other hand, a dimension of the elongated hole portion 31a2 in the upper and lower direction is slightly larger than a shaft diameter of the drive transmission shaft <NUM>. Further, a dimension of the elongated hole portion 31a2 in a longitudinal direction is larger than the shaft diameter of the drive transmission shaft <NUM>, and in the shown example, is about <NUM> times as large as the shaft diameter.

The drive transmission shaft <NUM> is provided to the main body frame <NUM> in a form of being inserted in the elongated hole portion 31a2 of the through-hole 31a, so that the drive transmission shaft is connected to the warp beam <NUM> via the pinion gear <NUM> inside the loom frame <NUM> and is connected to the output shaft of the delivery motor M via the gear train <NUM> outside the loom frame <NUM>.

Further, the drive transmission shaft <NUM> is supported with respect to the main body frame <NUM> (side frame <NUM>) by a support structure <NUM> attached to the main body frame <NUM>. Note that, the support structure <NUM> includes two bearings (a first bearing <NUM> and a second bearing <NUM>) so as to support the drive transmission shaft <NUM> at two places spaced apart from each other in an axis line direction. The drive transmission shaft <NUM> is rotatably supported with respect to the support structure <NUM> in such a form that the two bearings are externally fitted thereto.

In the loom described above, in the present invention, the support structure is configured to include a first bearing case configured to accommodate therein the first bearing and attached to the side frame inside the loom frame, and a second bearing case configured to accommodate therein the second bearing and attached to the side frame outside the loom frame. The present embodiment is an example where the first bearing case and the second bearing case are attached to the side frame <NUM> (main body frame <NUM>) by a common screw member. The support structure is described in detail, as follows.

As shown in <FIG> and <FIG>, the first bearing case <NUM> is a member having, as a main body, a first support portion 56a that is a portion formed in a substantially cylindrical shape whose both ends are opened. The first bearing case <NUM> has a first attaching portion 56b, which is a portion formed in a flange shape, on one end-side in an axis line direction of the first support portion 56a. Note that, <FIG> is a view of the first bearing case <NUM> seen from an inside of the loom frame <NUM> (seen from a direction of an arrow A in <FIG>), and <FIG> is a cross-sectional view taken along a line B-B in <FIG>.

In addition, as shown, the first support portion 56a of the first bearing case <NUM> has a portion (protruding portion) 56a1 protruding slightly inward in a radial direction from the other end so that an opening on the other end-side is smaller than an opening on one end-side where the first attaching portion 56b is provided. Further, in the first bearing case <NUM>, the first bearing <NUM> is accommodated in arrangement of being in contact with the protruding portion 56a1 at the first support portion 56a. Therefore, a dimension in the axis line direction of the first bearing case <NUM> (first support portion 56a) is larger than a thickness dimension of the first bearing <NUM>, and in the shown example, is a size slightly smaller than an interval between the pinion gear <NUM> and the main body frame <NUM>.

Further, as shown in <FIG>, the first attaching portion 56b is formed in a substantially trapezoidal shape. The first attaching portion 56b is formed at its four corners with through-holes 56b1 into which screw members <NUM> for attaching the first bearing case <NUM> to the main body frame <NUM> are inserted. Note that, the first bearing case <NUM> is attached to the main body frame <NUM> in a state where a position of the first bearing case <NUM> is fixed (positioned) with respect to the main body frame <NUM> by using positioning pins <NUM>. Therefore, the main body frame <NUM> is provided with two positioning pins <NUM> and <NUM> in a form of protruding from an inner surface (inner side wall) in the vicinity of upper and lower edges of the elongated hole portion 31a2 of the through-hole 31a. In addition, the first attaching portion 56b is formed with two positioning holes 56b2 and 56b2 in which the positioning pins <NUM> are inserted.

Further, as for the second bearing case, in the present embodiment, the gear case <NUM> described above is configured to accommodate a bearing, and the gear case <NUM> is adapted to serve as the second bearing case. That is, the gear case <NUM> is configured to have a second support portion 42a as a portion configured to accommodate therein the second bearing <NUM>, in addition to a gear train accommodating portion 42c as a portion configured to accommodate the gear train <NUM> described above. Further, the gear case <NUM> of the present embodiment has, as its configuration, a second attaching portion 42b, which is a portion for attaching the gear case to the main body frame <NUM>.

More specifically, as shown in <FIG>, <FIG> and <FIG>, the gear train accommodating portion 42c is constituted by a wheel accommodating portion 42c1 configured to accommodate the worm wheel 48a, a worm accommodating portion 42c2 configured to accommodate the worm 48b and the worm shaft 48c, and a gear accommodating portion 42c3 configured to accommodate the transmission gear 48d and the motor gear 48e.

Among them, the wheel accommodating portion 42c1 has a substantially cylindrical shape whose both ends are opened. In addition, the wheel accommodating portion 42c1 is configured so that an inner diameter is slightly larger than an outer diameter of the worm wheel 48a so as to accommodate the worm wheel 48a and a dimension (about two times, in the shown example) in the axis line direction is larger than a dimension in a thickness direction of the worm wheel 48a. Further, the wheel accommodating portion 42c1 is formed so that an opening on one end-side thereof is smaller than an opening on the other end-side. Further, a disk-shaped cover member <NUM> is attached to the other end of the wheel accommodating portion 42c1, and the opening on the other end-side is closed by the cover member <NUM>.

In addition, the worm accommodating portion 42c2 has a substantially cylindrical shape. Further, the worm accommodating portion 42c2 is configured so that an inner diameter is slightly larger than the outer diameter of the worm 48b and a dimension in an axis line direction thereof is slightly smaller than an outer diameter of the wheel accommodating portion 42c1. Further, the worm accommodating portion 42c2 is formed integrally with the wheel accommodating portion 42c1 on an outer peripheral surface of the wheel accommodating portion 42c1, in a direction in which an axis line direction thereof is made to be orthogonal to the axis line direction of the wheel accommodating portion 42c1. Further, in such an integrally formed state, the wheel accommodating portion 42c1 and the worm accommodating portion 42c2 are in a state where their internal spaces are connected to each other.

The worm shaft 48c is accommodated in the worm accommodating portion 42c2 in such a form that the worm wheel 48a and the worm 48b accommodated in the wheel accommodating portion 42c1 mesh with each other. More specifically, the drive transmission shaft <NUM> is rotatably supported by the gear case <NUM> (wheel accommodating portion 42c1), as described later. In addition, the support is made in such a form that the axis line direction of the drive transmission shaft <NUM> is made to coincide with the axis line direction of the wheel accommodating portion 42c1 forming a cylindrical shape and a shaft center of the drive transmission shaft <NUM> is made to substantially coincide with a center of the wheel accommodating portion 42c1, when seen in the axis line direction. Further, the worm wheel 48a is accommodated in the wheel accommodating portion 42c1 in a state of being fitted to one end portion of the drive transmission shaft <NUM>. Note that, in this state, the worm wheel 48a is provided in such an arrangement that a center of gear teeth thereof substantially coincides with a center of the worm accommodating portion 42c2 having a cylindrical shape, in the axis line direction.

Further, the worm shaft 48c is accommodated in the worm accommodating portion 42c2 in such an arrangement that the worm 48b meshes with the worm wheel 48a provided as described above in the axis line direction thereof. Note that, the worm shaft 48c is rotatably supported in the worm accommodating portion 42c2 via a bearing or the like (not shown). Further, the worm shaft 48c is provided in a form that one end portion thereof protrudes from the opened one end-side of the worm accommodating portion 42c2 in the state of being accommodated (supported) in this way.

In addition, the gear accommodating portion 42c3 is a portion configured to accommodate gears (the transmission gear 48d, the motor gear 48e) configured to connect the worm shaft 48c and the output shaft of the transmission motor M as described above, and in the shown configuration, is formed integrally with the worm accommodating portion 42c2. Specifically, the gear accommodating portion 42c3 is provided integrally with the worm accommodating portion 42c2 in such a form that one of both side surfaces thereof is continuous with an end edge on the above-described opened one end-side of the worm accommodating portion 42c2. Note that, one end portion of the worm shaft 48c protrudes from the opened one end-side of the worm accommodating portion 42c2. Therefore, one side surface of the gear accommodating portion 42c3 is formed with a through-hole in which one end portion of the worm shaft 48c is inserted. Thereby, the worm shaft 48c is in a state where one end portion thereof is located in the gear accommodating portion 42c3. Further, the transmission gear 48d is fixed to one end portion of the worm shaft 48c located in the gear accommodating portion 42c3.

In addition, the delivery motor M is attached to the other side surface of the gear accommodating portion 42c3 in a direction in which an axis line direction of the output shaft is made to coincide with the axis line direction of the worm shaft 48c and the output shaft is directed toward one side surface of the gear accommodating portion 42c3. Therefore, the other side surface of the gear accommodating portion 42c3 is formed with a through-hole in which the output shaft of the delivery motor M is inserted. Thereby, in a state where the delivery motor M is attached to the gear accommodating portion 42c3, most of the output shaft of the delivery motor M is located in the gear accommodating portion 42c3. Further, the motor gear 48e is fixed to the output shaft of the delivery motor M, as described above. The motor gear 48e and the transmission gear 48d are in a state of meshing with each other in the gear accommodating portion 42c3.

Further, the gear case <NUM> has the second attaching portion 42b, which is a portion for attaching the gear case to the main body frame <NUM>, as described above. More specifically, the wheel accommodating portion 42c1 of the gear train accommodating portion 42c has a substantially cylindrical shape, as described above, the opening on one end-side thereof is smaller than the opening on the other end-side, and the inner diameter of the opening on one end-side is about a half of the opening on the other end-side. Therefore, the wheel accommodating portion 42c1 has a wall portion 42c4 provided on the one end-side and extending in a radial direction with respect to the opening on the other end-side. In addition, the gear case <NUM> has four columnar leg portions 42b1 extending from the wall portion 42c4 in the axis line direction of the wheel accommodating portion 42c1, and the second attaching portion 42b is constituted by the four columnar leg portions 42b <NUM>.

Note that, the four leg portions 42b1 are formed on the wall portion 42c4 around the opening on one end-side of the wheel accommodating portion 42c1, when seen in the axis line direction of the wheel accommodating portion 42c1. In addition, positions where the four leg portions 42b <NUM> are formed are positions that can be aligned with the positions of the four through-holes 56b1 formed in the first attaching portion 56b of the first bearing case <NUM>. Further, the four leg portions 42b1 are formed so that positions thereof with respect to the wheel accommodating portion 42c1 are positions where the shaft center of the first bearing case <NUM> and a shaft center of the wheel accommodating portion 42c1 coincide with each other, when seen in the axis line direction of the first bearing case <NUM> (wheel accommodating portion 42c1), in the state where the positions are aligned with the positions of the four through-holes 56b1 as described above.

Further, as described above, in the present embodiment, the first bearing case <NUM> and the second bearing case (gear case <NUM>) are attached to the side frame <NUM> (main body frame <NUM>) by a common screw member. The common screw member is the screw member <NUM> described above. Therefore, as shown in <FIG>, an end surface of each leg portion 42b1 is formed with a female screw hole 42b3 in which the screw member <NUM> is screwed. In addition, the main body frame <NUM> is formed with four insertion holes 31b in which the screw members <NUM> are inserted.

Further, the gear case <NUM> is attached to the main body frame <NUM> by using a positioning pin (not shown) in a state where the position of the gear case <NUM> with respect to the main body frame <NUM> is fixed, as in the first bearing case <NUM>. Therefore, the main body frame <NUM> is provided with two positioning pins in a form of protruding from an outer surface (outer side wall) in the vicinity of the upper and lower edges of the elongated hole portion 31a2 of the through-hole 31a. In addition, end faces 42b2 of the corresponding two leg portions 42b1 of the four leg portions 42b1 are formed with positioning holes (not shown) in which the positioning pins are fitted.

In addition, the gear case <NUM> has a second support portion 42a as a portion configured to accommodate therein the second bearing <NUM>, in the wheel accommodating portion 42c1. More specifically, the gear case <NUM> is configured to include the second support portion 42a formed integrally with the wall portion 42c4 of the wheel accommodating portion 42c1. As shown in <FIG>, the second support portion 42a has a substantially cylindrical shape whose both ends are opened, and is formed integrally with the wall portion 42c4 in a form of protruding from an inner surface of the wall portion 42c4 toward an inside of the wheel accommodating portion 42c1. Note that, the second support portion 42a is formed at a position where a shaft center thereof coincides with the shaft center of the wheel accommodating portion 42c1, when seen in the axis line direction. Further, the second support portion 42a is a portion configured to accommodate therein the second bearing <NUM>, as described above, and is configured so that an inner diameter thereof is large enough to fit the second bearing <NUM> and a dimension in the axis line direction is slightly larger than a thickness dimension of the second bearing <NUM>.

In addition, the inner diameter of the second support portion 42a is larger than the opening on one end-side of the wheel accommodating portion 42c1 described above. Therefore, the second support portion 42a is configured such that a portion of the wall portion 42c4 exists on an inner side of the second support portion on the wall portion 42c4-side, when seen in the axis line direction. Further, in the second support portion 42a, the second bearing <NUM> is accommodated in a state of being in contact with the wall portion 42c4.

In the support structure <NUM> described above, the first bearing case <NUM> and the gear case (second bearing case) <NUM> are attached to the main body frame <NUM> by the common screw members <NUM> described above in a form of sandwiching the main body frame <NUM>.

Note that, in attaching, the first bearing case <NUM> is arranged inside the loom frame <NUM>, as described above, and is in contact with the inner surface of the main body frame <NUM> in a state of being positioned by the positioning pins <NUM>. Further, the gear case <NUM> is arranged outside the loom frame <NUM>, and is in contact with the outer surface of the main body frame <NUM> on the end surface 42b2 of each leg portion 42b1 of the second attaching portion 42b, in a state of being positioned by the positioning pins protruding from the outer surface of the main body frame <NUM>. In this state, the positions of the through-holes 56b1 formed in the first attaching portion 56b of the first bearing case <NUM> and the female screw holes 42b3 formed in the end surface 42b2 of the second attaching portion 42b of the gear case <NUM> coincide with each other with respect to the insertion holes 31b formed in the main body frame <NUM>, when seen in the axis line direction of the first support portion 56a (second support portion 42a).

Further, the screw members <NUM> are inserted into the through-holes 56b1 of the first bearing case <NUM> from the first bearing case <NUM>-side (inner side of the loom frame <NUM>), are inserted into the insertion holes 31b of the main body frame <NUM>, and are screwed into the female screw holes 42b3 of the gear case <NUM>. Thereby, the first bearing case <NUM> and the gear case (second bearing case) <NUM> are attached (fixed) to the main body frame <NUM> in a form of sandwiching the main body frame <NUM>.

Note that, in the attached state, the first support portion 56a and the second support portion 42a are in a state where the shaft centers thereof coincide with each other, when seen in the axis line direction of the first support portion 56a of the first bearing case <NUM> (the second support portion 42a of the gear case <NUM>). In addition, the drive transmission shaft <NUM> is supported by the first bearing case <NUM> and the gear case <NUM> in such a form that the first bearing <NUM> accommodated in the first support portion 56a is externally fitted inside the loom frame <NUM> and the second bearing <NUM> accommodated in the second support portion 42a is externally fitted outside the loom frame.

Thereby, the drive transmission shaft <NUM> is rotatably supported by the main body frame <NUM>. In a state where the drive transmission shaft <NUM> is supported in this way, the pinion gear <NUM> fixed to one end portion of the drive transmission shaft <NUM> is in mesh with the beam gear <NUM> of the warp beam <NUM>, and the worm wheel 48a is in mesh with the worm 48b supported (accommodated) by the worm accommodating portion 42c2 of the gear train accommodating portion 42c of the gear case <NUM>.

According to the loom <NUM> of the present embodiment configured as described above, the support structure <NUM> is configured such that the first bearing <NUM> is accommodated in the first bearing case <NUM> attached to the inner surface of the main body frame <NUM> (inside the loom frame <NUM>) and the second bearing <NUM> is accommodated in the gear case <NUM>, which also serves as the second bearing case attached to the outer surface of the main body frame <NUM> (outside the loom frame <NUM>). Therefore, the support structure <NUM> can arrange both the bearings of the first bearing <NUM> and the second bearing <NUM> at positions closer to the main body frame <NUM> (side frame <NUM>), as compared to a support structure of the related art where the first bearing and the second bearing are accommodated in a common bearing case.

Thereby, in the support structure <NUM>, a distance between a position where each bearing case (the first bearing case <NUM> and the gear case <NUM>) is attached to the main body frame <NUM> and a position where the bearing is accommodated becomes small. Therefore, a moment force that acts on the attaching portion of the bearing case as each bearing case receives a force from the bearing accommodated therein due to vibration of the loom frame <NUM> becomes small. Moreover, since the bearing case is provided for each bearing, the force that is received from the bearing by the bearing case due to the vibration becomes smaller, as compared to a configuration where the two bearings are accommodated in a common bearing case, like the support structure of the related art. As a result, the force that acts on the attaching portion of each bearing case due to the vibration becomes smaller, as compared to the support structure of the related art.

In this way, in the support structure <NUM>, the force that acts on the attaching portion of each bearing case due to the vibration can be made as small as possible, as compared to the support structure of the related art. Thereby, it is possible to suppress wear and the like occurring on the attaching portion, which are caused due to the force, and as a result, it is possible to suppress damage to each constitutional component in the drive mechanism <NUM>, such as each bearing case, both the bearings, the drive transmission shaft <NUM> and each gear member.

Further, in the loom <NUM> of the present embodiment, the first bearing case <NUM> and the gear case <NUM> are attached to the main body frame <NUM> by the common screw members <NUM>, so that the first bearing case <NUM> and the gear case <NUM> are attached to the main body frame 31in a form of sandwiching the main body frame <NUM>. Thereby, as compared to a case where the first bearing case <NUM> and the gear case <NUM> are individually attached to the main body frame <NUM>, the first bearing case <NUM> and the gear case <NUM> can be more firmly attached to the main body frame <NUM> (side frame <NUM>). As a result, it is possible to make it difficult for the wear and the like to occur on the attaching portions of the first bearing case <NUM> and the gear case <NUM>.

Note that, the present invention is not limited to the above-described embodiment (the above embodiment), and can also be implemented in following modified embodiments.

Claim 1:
A loom (<NUM>) comprising a drive transmission shaft (<NUM>) connected to a warp beam (<NUM>) via a gear member (<NUM>) inside a loom frame (<NUM>) including a pair of side frames, the drive transmission shaft (<NUM>) being inserted in a through-hole (31a) formed in the side frame (<NUM>); and a support structure (<NUM>) for supporting the drive transmission shaft (<NUM>), the support structure (<NUM>) including a first bearing (<NUM>) and a second bearing (<NUM>) externally fitted to the drive transmission shaft (<NUM>) at an interval in an axis line direction, characterized in that the support structure (<NUM>) comprises a first bearing case (<NUM>) configured to accommodate therein the first bearing (<NUM>) and attached to the side frame (<NUM>) inside the loom frame (<NUM>), and a second bearing case (<NUM>) configured to accommodate therein the second bearing (<NUM>) and attached to the side frame (<NUM>) outside the loom frame (<NUM>).