weaving machine

Abstract

The present invention aims to provide a loom structure in which a driving shaft is connected to a main shaft, a motor is connected to the driving shaft via a driving transmission mechanism, an opening device, a brake device, and a side frame are provided, and in which the connection structure connected to the driving shaft can be prevented from being damaged as much as possible when the brake device brakes the main shaft. The driving transmission mechanism includes a driving transmission shaft that extends in parallel with the driving shaft in the space of the side frame, protrudes from the side wall of the side frame, is connected to the motor, and is connected to the opening device, and a transmission mechanism that connects the driving transmission shaft to the driving shaft, and the brake device is connected to the driving transmission shaft.

Description

Technical Field

[0001] The present invention relates to a loom comprising: a drive shaft connected to the main shaft of the loom and connected via a swing mechanism to a swing shaft for swinging a reed; an electric motor connected to the drive shaft via a drive transmission mechanism to rotate and drive the drive shaft; a sheathing device driven by the electric motor; a braking device for braking the main shaft; and a side frame for housing the drive shaft and the swing shaft in an orientation such that the axial directions of the drive shaft and the swing shaft are aligned with the width direction. Background Technology

[0002] The loom has a shaft (drive shaft) at one end, which is connected to a main shaft and is driven by an electric motor. In a typical loom, this drive shaft is housed in one of a pair of side frames within the loom's frame. The drive shaft is driven by an electric motor, thereby rotating the main shaft connected to it. The rotation of this drive shaft also drives the reed. Specifically, a swing shaft for driving the reed is housed within one of the side frames, and this swing shaft is connected to the drive shaft via a swing mechanism such as a cam mechanism or crank mechanism. The loom is designed such that, as the drive shaft is rotated as described above, the swing shaft is driven to swing, thereby driving the reed.

[0003] Furthermore, as a structure (drive transmission mechanism) that connects the drive shaft to the motor for rotating the drive shaft as described above, there is, for example, the structure disclosed in Patent Document 1. In the structure disclosed in Patent Document 1 (hereinafter referred to as the "conventional structure"), an intermediate shaft (intermediate shaft) is provided between the drive shaft connected to the swing mechanism and the motor, and is connected to the motor via a pulley and a synchronous belt. Based on this, the intermediate shaft is connected to the drive shaft by a gear train.

[0004] Furthermore, the loom has a shedding device that moves the heald frame vertically to induce shedding motion in the warp yarns. Moreover, the shedding device is either driven by a dedicated motor or connected to a drive shaft to use an electric motor as the drive source. Therefore, in such a loom, the electric motor and the shedding device are connected to the drive shaft. However, in the conventional structure described above, the shedding device is connected to an intermediate shaft connected to the electric motor in the aforementioned manner. That is, in this conventional structure, the electric motor and the shedding device are connected to the drive shaft via an intermediate shaft and a gear train.

[0005] Furthermore, the loom is equipped with a braking device for applying brakes to the main shaft. Based on this, in the existing structure, the braking device is configured to be connected to the other end of the drive shaft, and brakes the main shaft by applying brakes to the drive shaft.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent Application Publication No. 5-156551 Summary of the Invention

[0009] The problem that the invention aims to solve

[0010] However, in existing structures where the braking device is connected to the end of the drive shaft, if the drive shaft is braked to brake the main shaft, a braking force is applied to the intermediate shaft via the gear train to stop its rotation. Furthermore, if the intermediate shaft is braked in this way, the motor and the opening device connected to the intermediate shaft are also braked. This results in an inertial force generated by the braking of the motor and the opening device acting on the intermediate shaft. Therefore, in the gear train connecting the braked drive shaft and the intermediate shaft, which rotates against the braking force by applying this inertial force, a load corresponding to the aforementioned inertial force is applied to the meshing portion of the gears on the drive shaft side and the intermediate shaft side. Consequently, there is a concern about damage to the gear train.

[0011] Furthermore, in cases where the width of the heald frames is large, such as on wide-width looms, or when there are many heald frames mounted on the loom or used for weaving, the inertial force generated by the braking of the shedding device is greater. Moreover, since the driving force of the motor driving the shedding device also becomes greater, the inertial force generated by the motor's braking also becomes greater. Therefore, in such cases, when the braking device applies braking, the load applied to the gear train becomes greater, as described above, making it more prone to the aforementioned damage.

[0012] Furthermore, in addition to gear trains, a combination of pulleys and timing belts is considered as the connection structure connecting the drive shaft and the intermediate shaft. However, in this case, since the intermediate shaft tends to rotate relative to the braked drive shaft due to the aforementioned inertial force, a load corresponding to the aforementioned inertial force is also applied to the timing belt connecting the drive shaft and the intermediate shaft. As a result, there is a concern that the timing belt may break.

[0013] Therefore, the object of the present invention is to provide a loom structure that can minimize damage to the aforementioned connecting structure when the braking device is braking.

[0014] Solution for solving the problem

[0015] To achieve the above objectives, the present invention is characterized in that, in the above-described loom, the drive transmission mechanism includes: a drive transmission shaft that extends parallel to the drive shaft within the space of the side frame and protrudes from the side wall of the side frame, is connected to a motor and to a sheathing device; and a transmission mechanism that connects the drive transmission shaft to the drive shaft, wherein the braking device is connected to the drive transmission shaft.

[0016] The effects of the invention are as follows.

[0017] According to the loom of the present invention, this structure reduces the load applied to the connection structure linking the drive shaft and the drive transmission shaft during braking. More specifically, during braking, braking is applied to both the drive shaft and the drive transmission shaft. Simultaneously, inertial forces generated by braking are applied to the connected components of both the drive shaft and the drive transmission shaft. Furthermore, as described above, the drive transmission shaft is connected to a motor and a shedding device as components. Additionally, the drive shaft is connected to a main shaft, a weft-beating device, and the like as components.

[0018] However, in the case of a structure where a braking device is connected to one of two shafts that are respectively connected to one or more structural elements and interconnected by a connecting structure, as in the existing structure or the structure of the present invention, the braking device directly applies braking to one shaft (the braking shaft), and simultaneously, the other shaft (the shaft being braked) receives the braking force via the connecting structure. That is, the connecting structure becomes the part that causes the braking force of the braking shaft to act on the shaft being braked.

[0019] Furthermore, the inertial force generated by the aforementioned components, which accompanies the braking of each shaft, naturally acts in the direction of shaft rotation. Therefore, on the braking shaft side, this inertial force acts in the direction that weakens the braking force of the braking device. Thus, the braking force of the braking shaft acting on the aforementioned connecting structure becomes a force that weakens the braking force the braking device intends to exert on the braking shaft, acting on the braking shaft side. On the other hand, the inertial force acting on the braked shaft becomes the force that the braked shaft resists the braking force received from the aforementioned connecting structure (the braking force of the braking shaft acting on the aforementioned connecting structure). Therefore, the greater the inertial force acting on the braking shaft (the smaller the braking force of the braking shaft acting on the aforementioned connecting structure), the smaller the load applied to the aforementioned connecting structure; furthermore, the greater the inertial force acting on the braked shaft (the greater the force resisting the braking force received from the aforementioned connecting structure), the greater the load applied to the aforementioned connecting structure.

[0020] Based on this, in a loom, during the aforementioned braking, the inertial force acting on the shaft (drive transmission shaft) by the motor and the shedding device is generally greater than the inertial force acting on the shaft (drive shaft) by the main shaft, the beating device, etc. Therefore, compared to the existing structure that uses the drive shaft as the braking shaft, the structure of the present invention, which uses the drive transmission shaft as the braking shaft, applies less load to the aforementioned connecting structure during the aforementioned braking. Thus, according to the present invention, damage to the aforementioned connecting structure can be prevented as much as possible. Attached Figure Description

[0021] Figure 1 This is a front sectional view of a loom 1 according to one embodiment of the present invention.

[0022] Figure 2 yes Figure 1 A sectional view along line AA.

[0023] Explanation of symbols

[0024] 1—Loom, 5—Main shaft, 10—Frame, 12—Drive-side frame (side frame), 12a—Outer wall of drive-side frame, 12b—Inner wall of drive-side frame, 14—Frame body, 14a—Outer wall of frame body, 14b—Inner wall of frame body, 14c—Open part, 14d—Through hole, 14e—Protrusion, 16—Frame cover, 20—Motor, 22—Output shaft, 30—Drive shaft, 32—Eccentric part, 40—Weft-beating mechanism, 42—Reed, 44—Rocker arm shaft, 50—Swing shaft, 60—Swing mechanism, 62—Swing arm, 64—Connecting rod, 70—Coupling assembly, 72—Coupling assembly, 80—Drive transmission 82—Drive transmission shaft, 84—Transmission mechanism, 84a—Drive gear, 84b—Driven gear, 90—Drive mechanism, 92—Drive gear train, 92a—Drive gear, 92b—Driven gear, 94—Drive gearbox, 94a—One side wall, 94a1—Outer side, 94b—Another side wall, 94c—Through hole, 94d—Through hole, 94e—Protrusion, 96—Open shaft, 98—Open gear train, 98a—Drive gear, 98b—Driven gear, 100—Oil seal, 110—Brake device, 110a—Main housing, 110b—Brake component, 110c—Braked component, 120—Opening device. Detailed Implementation

[0025] The following is based on Figure 1 and Figure 2 An embodiment (example) of a loom in which the present invention is applied will be described.

[0026] In the loom 1, the frame 10 comprises a pair of box-shaped side frames 12, 12 connected by a plurality of beam members. The loom 1 also includes a motor 20, configured to drive the main shaft 5 of the loom 1. Furthermore, the motor 20 is located on one of the side frames 12 (hereinafter referred to as the "drive side frame") 12.

[0027] Furthermore, the drive-side frame 12 is composed of a frame body 14 as the main body and a frame cover 16 mounted on the frame body 14. Specifically, the frame body 14 is formed into a box shape with an internal space, and is open in a shape that is part of the side wall (outer wall portion) 14a that is the outer side in the width direction of the loom 1 (the portion corresponding to the swing mechanism 60, etc., described below when viewed along the width direction). The frame cover 16 is formed into a plate-shaped component, having a size that can cover the open portion (opening portion) 14c of the frame body 14. Moreover, the drive-side frame 12 is structured such that the frame cover 16 is mounted on the frame body 14 in a manner that covers the open portion 14c. Therefore, the side wall (outer wall) 12a of the drive-side frame 12 that is the outer side in the aforementioned width direction is composed of the outer wall portion 14a of the frame body 14 and the frame cover 16 that covers its open portion 14c. In addition, the frame cover 16 is mounted relative to the frame body 14 using threaded components such as bolts (not shown), and the frame cover 16 can be attached to and detached from the frame body 14.

[0028] Furthermore, the loom 1 includes a drive shaft 30 mounted between the motor 20 and the main shaft 5, which is driven by the motor 20 to rotate and in turn drive the main shaft 5. The loom 1 also includes a swing shaft 50 for swinging the rocker arm shaft 44 in the weft insertion device 40, and a swing mechanism 60 connecting the swing shaft 50 to the drive shaft 30. In this embodiment, a crank mechanism is used as an example of the swing mechanism 60. The drive shaft 30, swing shaft 50, and swing mechanism 60 are arranged within the space of the drive side frame 12, within the opening 14c of the drive side frame 12 when viewed along the width direction. A detailed description of each structure in this loom 1 is as follows.

[0029] The drive shaft 30 is formed such that its dimension (length dimension) in the axial direction is larger than the dimension in the width direction of the drive side frame 12. However, the drive shaft 30 is a crank-shaped shaft in which the middle part is eccentrically oriented relative to the two side parts (side parts). Moreover, the drive shaft 30 is rotatably supported by bearings on the two side walls 12a, 12b of the drive side frame 12 with its axial direction aligned with the width direction, and is housed in the drive side frame 12 in this manner.

[0030] Furthermore, when viewing the drive-side frame 12 along the aforementioned width direction, the support position is such that the drive shaft 30 is located below the middle of the opening 14c of the frame body 14. Moreover, the drive shaft 30 is supported on the frame cover 16 at one end. Therefore, the drive shaft 30 is positioned such that the portion at its other end protrudes from the inner sidewall (inner wall portion) 14b of the frame body 14 in the aforementioned width direction. Furthermore, the drive shaft 30 is supported on the inner wall portion of the frame body 14 at a portion closer to the drive-side frame 12 than its protruding portion. Moreover, the main shaft 5 is connected to the other end of the drive shaft 30 by a coupling member 70.

[0031] Similar to the drive shaft 30, the swing shaft 50 is formed as a shaft larger than the aforementioned width dimension of the drive-side frame 12. Furthermore, the swing shaft 50, in the same orientation as the drive shaft 30, is supported by bearings on the two side walls 12a, 12b of the drive-side frame 12 and housed within the drive-side frame 12. Moreover, when the drive-side frame 12 is viewed along the aforementioned width direction, this support position, like that of the drive shaft 30, is within the range of the open portion 14c of the frame body 14, and is positioned higher than that of the drive shaft 30. The swing shaft 50 is also supported at one end by the frame cover 16, and includes a portion at the other end that protrudes from the inner wall portion 14b of the frame body 14, supporting the inner wall portion 14b of the frame body 14 at its other end. Furthermore, at the other end of the swing shaft 50, a rocker arm shaft 44 to which a support reed 42 is connected is connected by a coupling member 72.

[0032] The swing mechanism 60, as described above, is a crank mechanism, including: a swing arm 62 that is not rotatably disposed relative to the swing shaft 50; and a connecting rod 64 that connects the swing arm 62 to the eccentric portion 32 of the drive shaft 30. Furthermore, in the illustrated example, the swing shaft 50 and the swing arm 62 are formed as a single unit. The connecting rod 64 is rotatably connected to the swing arm 62 and the drive shaft 30 (eccentric portion 32) relative to them. Based on this, in this swing mechanism 60, the eccentric portion 32 rotates at a position eccentric to the axis from both sides of the drive shaft 30 by rotating the drive shaft 30, thereby swinging the swing arm 62 (swing shaft 50) connected to the eccentric portion 32 via the connecting rod 64. Therefore, in this structure, a portion of the drive shaft 30 also functions as the swing mechanism 60. Moreover, by swinging the swing shaft 50 in this way, the rocker arm shaft 44 connected to the swing shaft 50 and the reed 42 supported on the rocker arm shaft 44 swing, thereby performing the weft-beating action.

[0033] In the loom 1 described above, the loom 1 includes a drive transmission mechanism 80 that connects the drive shaft 30, which is connected to the motor 20, to the drive shaft 30 connected to the main shaft 5 for rotational drive by the motor 20. Furthermore, the drive transmission mechanism 80 is configured to include a drive transmission shaft 82 connected to the motor 20, and a transmission mechanism 84 connecting the drive transmission shaft 82 to the drive shaft 30. In addition, a braking device 110 provided on the loom 1 for braking the main shaft 5 is configured to directly brake the drive transmission shaft 82. Furthermore, an opening device 120 that reciprocates in the vertical direction to drive the heald frame (not shown) uses the motor 20 as a drive source and is connected to the drive transmission shaft 82, which is connected to the motor 20. A detailed description of this embodiment of the loom 1 is as follows.

[0034] The drive transmission shaft 82 is formed such that its dimension (length dimension) in the axial direction is larger than the dimension in the width direction of the drive side frame 12 and larger than the length dimension of the drive shaft 30. Based on this, the drive transmission shaft 82 is supported at one end of the drive side frame 12 via a bearing, parallel to the drive shaft 30, and extends through the outer wall portion 14a of the frame body 14 (the outer wall 12a of the drive side frame 12). Its other end is positioned outward relative to the outer wall portion 14a. Therefore, the drive transmission shaft 82 is housed within the drive side frame 12 from the bearing-supported portion to the outer wall portion 14a. However, while the drive transmission shaft 82 is supported at one end of the inner wall 12b as described above, it also protrudes from the inner wall 12b with one end positioned outward relative to the inner wall 12b. Based on this, the drive transmission shaft 82, configured in this way, is connected to the drive shaft 30 within the drive side frame 12 by a transmission mechanism 84.

[0035] Furthermore, the support position of the drive transmission shaft 82 is outside the range of the open portion 14c in the frame body 14, and is a position separated downward relative to the drive shaft 30. In order to allow the drive transmission shaft 82 to pass through, a through hole 14d is formed in the outer wall portion 14a of the frame body 14 at a position corresponding to the support position.

[0036] In this embodiment, the transmission mechanism 84 is configured as a gear system including two gears housed within the drive-side frame 12. Specifically, the transmission mechanism 84 consists of a drive gear 84a and a driven gear 84b. The drive gear 84a is mounted on the drive transmission shaft 82 in a manner that prevents it from rotating relative to the drive transmission shaft 82, and the driven gear 84b meshes with the drive gear 84a and is mounted on the drive shaft 30 in a manner that prevents it from rotating relative to the drive shaft 30. Furthermore, the drive gear 84a and the driven gear 84b are mounted on their respective shafts at a position closer to the inner wall 12b of the drive-side frame 12 in the width direction than the connection position between the drive shaft 30 (eccentric portion 32) and the swing mechanism 60 (connecting rod 64). That is, in this embodiment, the drive transmission shaft 82 and the drive shaft 30 are connected at a position closer to the inner wall 12b of the drive-side frame 12 in the width direction than the connection position between the drive shaft 30 and the swing mechanism 60.

[0037] Furthermore, the drive transmission shaft 82 is connected at its other end to a drive mechanism 90 containing a motor 20, which is used to rotate the drive transmission shaft 82. In addition to the motor 20, the drive mechanism 90 also includes a drive gear train 92 that connects the output shaft 22 of the motor 20 to the drive transmission shaft 82. The drive mechanism 90 has a drive housing 94 that forms the base, with the motor 20 mounted on the outer surface of the drive housing 94 and the drive gear train 92 housed within it.

[0038] Furthermore, the drive housing 94 is configured such that a motor 20 is mounted on the outer surface 94a1 of one of the opposing side walls 94a and 94b, and these two side walls 94a and 94b are parallel to the outer side wall 12a of the drive side frame 12. Moreover, the drive housing 94 overlaps with the drive side frame 12 in the front-rear direction of the loom 1. Since the drive transmission shaft 82 protruding from the drive side frame 12, as described above, is connected to the drive gear train 92 housed within the drive housing 94, the drive transmission shaft 82 passes through the other side wall 94b of the pair of side walls 94a and 94b of the drive housing 94, with its other end portion located within the drive housing 94. Therefore, a through hole 94d is formed in the other side wall 94b of the drive housing 94 to allow the drive transmission shaft 82 to pass through.

[0039] Based on this, as described above, the drive transmission shaft 82 protruding from the drive-side frame 12 is supported at its other end by a bearing on a side wall 94a of the drive housing 94. However, the drive housing 94 is configured such that its other side wall 94b through which the drive transmission shaft 82 passes is separate from the drive-side frame 12.

[0040] The motor 20 is mounted to the drive housing 94 with bolts or the like (not shown) in a position separated upwards from the drive transmission shaft 82, which is supported as described above, with the output shaft 22 facing the drive-side frame 12. Furthermore, a through hole 94c is formed in one side wall 94a of the drive housing 94 at its mounting position, allowing the output shaft 22 of the motor 20 to pass through. Therefore, with the motor 20 mounted in the drive housing 94 as described above, its output shaft 22 extends along the width direction within the drive housing 94 and exists parallel to the drive transmission shaft 82. Based on this, the output shaft 22 is connected to the other end of the drive transmission shaft 82 within the drive housing 94 via the drive gear train 92.

[0041] The driving gear train 92 is the same as the gear train 84 that connects the drive shaft 30 and the drive transmission shaft 82, and consists of two gears. Specifically, the driving gear train 92 consists of a driving gear 92a and a driven gear 92b, wherein the driving gear 92a is mounted on the output shaft 22 of the motor 20 in a manner that prevents it from rotating relative to the output shaft 22, and the driven gear 92b meshes with the driving gear 92a and is mounted on the drive transmission shaft 82 in a manner that prevents it from rotating relative to the drive transmission shaft 82.

[0042] Furthermore, the drive mechanism 90 includes a shedding shaft 96 connected to the shedding device 120 in the loom 1 and a shedding gear train 98 connecting the drive transmission shaft 82 to the shedding shaft 96. The shedding shaft 96 is formed such that its axial dimension (length dimension) is larger than the aforementioned width dimension of the drive housing 94. Moreover, at a position separated downwards from the drive transmission shaft 82, the shedding shaft 96 is supported by bearings on two side walls 94a and 94b of the drive housing 94, parallel to the drive transmission shaft 82. However, one end of the shedding shaft 96 protrudes from one side wall 94a of the drive housing 94. The shedding shaft 96 is connected to the shedding device 120 at its protruding end.

[0043] Based on this, the open shaft 96 is connected to the drive transmission shaft 82 via an open gear train 98 within the drive housing 94. Furthermore, this open gear train 98, like the drive gear train 92, consists of two gears. Specifically, the open gear train 98 consists of a drive gear 98a and a driven gear 98b, wherein the drive gear 98a is mounted on the drive transmission shaft 82 in a manner that prevents relative rotation, and the driven gear 98b meshes with the drive gear 98a and is mounted on the open shaft 96 in a manner that prevents relative rotation.

[0044] Furthermore, the braking device 110 is an electromagnetic brake, designed to directly apply braking to the drive transmission shaft 82. In this embodiment, the braking device 110 is located further inward in the width direction than the inner wall 12b of the drive-side frame 12. The braking device 110 is constructed with a box-shaped main body housing 110a as its main body, and is mounted within the inner wall 12b of the drive-side frame 12. Additionally, the braking device 110 includes a braking component 110b housed within the main body housing 110a and a braked component 110c, which is configured to be directly mounted to one end of the drive transmission shaft 82 (the end protruding from the inner wall 12b).

[0045] Furthermore, the braked component 110c is a disc-shaped component, and it is mounted on the drive transmission shaft 82 without being rotatable relative to the drive transmission shaft 82 when the drive transmission shaft 82 is inserted through the through hole formed in the central protrusion. The brake component 110b is subjected to force in the axial direction of the drive transmission shaft 82 on which the braked component 110c is mounted by a force-applying component such as a spring (not shown). Moreover, the braking device 110 is configured such that the built-in excitation coil (not shown) is in an energized state (or de-energized state), causing the brake component 110b to displace towards the braked component 110c against the force of the force-applying component. Therefore, the braking device 110 applies braking to the drive transmission shaft 82 by pressing the brake component 110b against the braked component 110c, thereby applying braking to the drive shaft 30, the motor 20, and the opening device 120 connected to the drive transmission shaft 82.

[0046] Furthermore, in the illustrated example, the frame body 14 has a protrusion 14e that protrudes from the outer wall portion 14a toward the drive housing 94 around the through hole 14d in the outer wall portion 14a of the frame body 14. On the other hand, the drive housing 94 also has a protrusion 94e that protrudes from the other side wall 94b toward the drive-side frame 12 around the through hole 94d in the other side wall 94b of the drive housing 94. Moreover, the frame body 14 and the drive housing 94 are connected by their two protrusions 14e and 94e fitting together. Additionally, an oil seal 100 is provided between the inner circumferential surface of the protrusions 14e and 94e and the drive transmission shaft 82 within the space of these protrusions 14e and 94e.

[0047] According to the loom 1 of this embodiment configured as described above, when the loom 1 (main shaft 5) is braked, the braking device 110 directly applies braking to the drive transmission shaft 82. Therefore, the load applied to the transmission mechanism 84 that connects the drive transmission shaft 82 and the drive shaft 30 is smaller than that of the conventional device.

[0048] More specifically, if the braking device 110 is activated, the braking force of the braking device 110 acts directly on the drive transmission shaft 82, applying braking to the drive transmission shaft 82. Then, if the drive transmission shaft 82 is braked, the drive shaft 30 connected to the drive transmission shaft 82 is also braked, as are the motor 20 and the opening device 120. Moreover, the braking of the drive shaft 30 is performed in conjunction with the braking of the main shaft 5 and the weft insertion device 40 connected to the drive shaft 30. Furthermore, since the drive transmission shaft 82 and the drive shaft 30 are connected via the transmission mechanism 84 (drive gear 84a, driven gear 84b) as described above, the drive gear 84a mounted on the drive transmission shaft 82 applies braking force to the driven gear 84b mounted on the drive shaft 30 to brake the drive shaft 30 (main shaft 5, weft insertion device 40).

[0049] Based on this, if braking is applied to the drive transmission shaft 82, the inertia of the motor 20 and the opening device 120, which are braked together, exerts an inertial force on the drive transmission shaft 82. Simultaneously, the braking force exerted by the drive gear 84a on the driven gear 84b becomes a force that reduces the braking force of the braking device 110 by a fraction of this inertial force due to the effect of this inertial force. That is, during braking, in the transmission mechanism 84, the drive gear 84a exerts a braking force of this magnitude on the driven gear 84b. On the other hand, if braking is applied to the drive shaft 30, an inertial force generated by the main shaft 5 and the weft insertion device 40 acts on the drive shaft 30. Moreover, this inertial force acts on the drive gear 84a as a force resisting the braking force via the driven gear 84b in the transmission mechanism 84.

[0050] Thus, when the drive transmission shaft 82 and drive shaft 30 are connected by a gear train such as the transmission mechanism 84, during braking, the gear on the braking side (drive gear 84a) applies braking force to the gear on the braked side (driven gear 84b), and the gear on the braking side receives a force resisting the braking force from the gear on the braked side. Furthermore, the greater this force, the greater the load applied to the transmission mechanism 84. In addition, in a loom, generally speaking, the inertial force acting on the drive transmission shaft 82 during braking (the inertial force generated by the motor 20 and the sheathing device 120) is greater than the inertial force acting on the drive shaft 30 (the inertial force generated by the main shaft 5 and the sheathing device 120). Therefore, if a loom structure is adopted in which the driving transmission shaft 82, which has a larger inertial force during braking, is directly braked, both the braking force and the force resisting the braking force become smaller than in existing devices. Therefore, the load applied to the transmission mechanism 84 is smaller than in existing devices, and as a result, damage to the transmission mechanism 84 is minimized.

[0051] The above describes one embodiment of a loom using the present invention (hereinafter referred to as "the above embodiment"). However, the present invention is not limited to the structure described in the above embodiment, and can also be implemented in other embodiments (modifications) below.

[0052] (1) Regarding the connection position between the braking device and the drive transmission shaft, in the above embodiment, the connection position is the inner side relative to the drive side frame 12 in the width direction. However, in this invention, the connection position is not limited to the inner side relative to the drive side frame, and may also be the outer side. Moreover, in this case, the braking device can be installed on the outer wall of the drive side frame or on the side wall of the drive housing.

[0053] (2) Regarding the transmission mechanism connecting the drive shaft and the drive transmission shaft, the transmission mechanism is not limited to the gear system consisting of two gears, a drive gear 84a and a driven gear 84b, housed within the drive-side frame 12 as described in the above embodiment. For example, the transmission mechanism can also be composed of a gear system, or a gear system consisting of three or more gears. Furthermore, the transmission mechanism is not limited to being composed of a gear system; it can also be configured to connect the pulley mounted on the drive shaft to the pulley mounted on the drive transmission shaft using a synchronous belt.

[0054] Furthermore, the structure connecting the motor and the opening device to the drive transmission shaft is not limited to the gear train consisting of two gears as described in the above embodiment. Similar to the transmission mechanism described above, it can be a gear train consisting of three or more gears, or it can be a structure connected by pulleys and synchronous belts. In addition, in such a structure connecting the motor and the opening device to the drive transmission shaft, one of the motor and the opening device can also be configured to be connected to the drive transmission shaft via a coupling member or the like.

[0055] (3) Regarding the position where the drive shaft and the drive transmission shaft are connected by the transmission mechanism, in the above embodiment, the connection position is located on the inner wall 12b side of the drive side frame 12 relative to the eccentric portion 32 of the drive shaft 30 in the width direction. However, the connection position may also be located on the outer wall 12a side of the drive side frame 12 relative to the eccentric portion 32 of the drive shaft 30 in the width direction.

[0056] (4) Regarding the swing mechanism, the above embodiment is an example of applying the present invention to a loom employing a crank mechanism as the swing mechanism 60. Furthermore, in the above embodiment, the swing arm 62 and the swing shaft 50 in the swing mechanism 60 are integrally formed. However, even if the swing mechanism is a crank mechanism as described in the above embodiment, it can be configured such that the swing arm and swing shaft are separate components, but connected in a manner that prevents relative rotation. Furthermore, the swing mechanism is not limited to the crank mechanism of the above embodiment; it can also be a cam mechanism. In this case, the shaft on which the cam is mounted becomes the drive shaft as described in the present invention.

[0057] Furthermore, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

Claims

1. A loom comprising: a drive shaft connected to the main shaft of the loom and connected via a oscillating mechanism to a oscillating shaft for oscillating drive of a reed; an electric motor connected to the drive shaft via a drive transmission mechanism and rotatably driving the drive shaft; a sheathing device driven by the electric motor; a braking device for braking the main shaft; and a side frame for housing the drive shaft and the oscillating shaft in an orientation such that the axial directions of the drive shaft and the oscillating shaft are aligned with the width direction. Its features are, The aforementioned drive transmission mechanism includes: a drive transmission shaft extending parallel to the drive shaft within the space of the side frame and protruding from the side wall of the side frame, connected to the motor and the opening device; and a transmission mechanism connecting the drive transmission shaft to the drive shaft. The aforementioned braking device is connected to the aforementioned drive transmission shaft.

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