Driving device of loom

Abstract

The utility model provides a driving device of a loom, which comprises a main transmission shaft, a first driving subsystem and a second driving subsystem, the first driving subsystem is used for driving an opening device to enable warps to move up and down, the second driving subsystem is used for driving a going part to swing, and the first driving subsystem comprises a first driving shaft and a cam mechanism. The cam structure comprises a cam shaft and at least two cam pairs, each cam pair comprises a first heald frame conjugate cam and a second heald frame conjugate cam, the first heald frame conjugate cams and the second heald frame conjugate cams are both installed on the cam shaft, in the weaving operation, the first driving shaft is connected with the main transmission shaft, the cam shaft is connected with the first driving shaft, and the cam shaft is connected with the second driving shaft. The first drive shaft rotates at a speed that is half the weaving speed, and the camshaft is connected to the first drive shaft by means of gear transmissions selected from the group of 1: 2, 1: 2.5, and 1: 3. According to the utility model, a plurality of different interweaving modes are woven by using one driving system.

Description

Technical Field

[0001] This invention relates to the field of looms, and more specifically to a drive device for a loom. Background Technology

[0002] In existing technology, the reed of a loom moves in an oscillating manner, and it moves back and forth in each weaving cycle. Weft-beating elements, such as heald frames with heddles, move up and down. For a 1 / 1 interlacing pattern, each heald frame moves up and down in each weaving cycle. For more complex interlacing patterns, the heald frames may move up and down, or they may not move at all.

[0003] Existing technology, such as patent WO 2006 / 002962 A1, discloses a drive system comprising a first drive subsystem and a second drive subsystem for driving a weft-beating device and a reed holder of a loom. This drive system includes a main drive shaft with a switching wheel integrally formed or mounted on it. In a first switching position, the switching wheel meshes with the first and second drive wheels. The first drive wheel drives the first drive subsystem, which includes a first drive shaft integrally formed or connected to the first drive wheel. The first drive shaft is driven by the weft-beating device, causing the warp yarns forming the shed to move up and down. The second drive wheel drives the second drive subsystem, which includes a second drive shaft integrally formed or connected to the second drive wheel. The second drive shaft is driven by the reed holder of the loom, causing the reed holder to move in a oscillating manner, particularly moving it back and forth to drive the weft yarn into the weave. The existing conjugate cam drive method, especially the loom reed seat drive method, with only one conjugate cam pair on the second drive shaft, makes it difficult to increase the loom speed and weft insertion rate, and further production efficiency has reached a bottleneck.

[0004] Therefore, it is necessary to provide a new technical solution. Summary of the Invention

[0005] To address the technical problems existing in the prior art, this invention discloses a driving device for a loom, the specific technical solution of which is as follows:

[0006] The drive unit of the loom of the present invention includes a main drive shaft, a first drive subsystem for driving the sheathing device to move the warp yarns up and down, and a second drive subsystem for driving the reed to oscillate. The first drive subsystem includes a first drive shaft and a cam mechanism. The cam structure includes a cam shaft and at least two cam pairs. Each cam pair includes a first conjugate cam and a second conjugate cam of the heald frame. Both the first conjugate cam and the second conjugate cam of the heald frame are mounted on the cam shaft. During the weaving operation, the first drive shaft is connected to the main drive shaft, and the cam shaft is connected to the first drive shaft. The first drive shaft rotates at half the weaving speed. The cam shaft is connected to the first drive shaft through a gear transmission device with a transmission ratio selected from groups of 1:2, 1:2.5, and 1:3. Both the first conjugate cam and the second conjugate cam of the heald frame in the cam pair have two convex angles. The cam profiles of the first conjugate cam and the second conjugate cam of the heald frame are configured such that the rocker arm performs two working cycles for every revolution of the cam shaft.

[0007] Furthermore, the cam mechanism includes several rockers, wherein the number of rockers is equal to the number of logarithms of the cam pair.

[0008] Furthermore, each rocker arm cooperates with a first cam follower and a second cam follower, and the first cam follower and the second cam follower are respectively driven and connected to the first conjugate cam and the second conjugate cam of the heald frame in a cam pair.

[0009] Furthermore, the cam mechanism has an even number of cam pairs.

[0010] Furthermore, the cam mechanism has two or four cam pairs.

[0011] Furthermore, the camshaft is connected to the first drive shaft via a gear transmission device comprising two meshing bevel gears.

[0012] Furthermore, the second drive subsystem includes a second drive shaft. During the weaving operation, the second drive shaft is connected to the main drive shaft. The second drive subsystem includes a reed rod unit that is oscillating around the reed rod shaft, and a reed drive unit for driving the reed rod unit. The reed drive unit includes a first reed conjugate cam and a second reed conjugate cam. Both the first and second reed conjugate cams are mounted on the second drive shaft and rotate with it. The reed rod unit includes a first cam follower and a second cam follower. The first and second cam followers are respectively driven and connected to the first and second reed conjugate cams in a one-to-one correspondence.

[0013] Furthermore, the second drive shaft rotates at half the speed of the loom, and the first conjugate cam of the reed seat in the second drive subsystem has two convex angles, and the second conjugate cam of the reed seat has four convex angles. Each convex angle of the first conjugate cam of the reed seat extends within half the circumference of the cam profile of the first conjugate cam of the reed seat, and two adjacent convex angles of the second conjugate cam of the reed seat extend within half the circumference of the cam profile of the second conjugate cam of the reed seat.

[0014] Furthermore, the cam profiles of the first conjugate cam and the second conjugate cam of the reed seat in the second drive subsystem are configured such that the reed rod unit completes two working cycles when the second drive shaft rotates one revolution.

[0015] The present invention has the following beneficial effects:

[0016] The loom drive device of the present invention uses a single drive system to weave several different interlacing patterns. This drive system is used to move the warp yarns up and down and drive the reed, even when a second drive subsystem is selected to drive the reed, causing the reed bar unit to complete two work cycles in one rotation of the second drive shaft. With the loom drive system of the present invention maintaining the original rotational speed of the second drive shaft, the reed of the loom will generate two weft insertions, directly doubling the weft insertion rate of the loom, thus doubling the production efficiency.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the drive device for the loom of the present invention;

[0020] Figure 2 This is a schematic diagram of the second drive subsystem of the present invention for driving the reed seat to swing.

[0021] Figure 3 This is a schematic diagram of the cam mechanism (without housing) of the first drive subsystem of the gear transmission device of the present invention with a transmission ratio of 1:2;

[0022] Figure 4 for Figure 3Side view of the cam mechanism;

[0023] Figure 5 for Figure 4 Top view of the cam mechanism;

[0024] Figure 6 This is a schematic diagram of the cam mechanism (without housing) of the first drive subsystem of the gear transmission device of the present invention, which has a transmission ratio of 1:2.5.

[0025] Figure 7 This is a schematic diagram of the cam mechanism (without housing) of the first drive subsystem of the gear transmission device of the present invention, which has a transmission ratio of 1:3. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0027] In the description of this invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] In loom weaving operations, a weft-beating operation is performed once per weaving cycle. In the context of this application, "weaving speed" is defined as the number of weaving cycles per unit time, or in other words, the number of weft-beating operations performed by the reed per unit time. Typically, one weft yarn is inserted per weaving cycle.

[0030] A full revolution of the camshaft or one revolution of the camshaft is defined as a 360° rotation of the camshaft. The cam mechanism causes the movement of the associated warp yarns. In particular, in an embodiment, the beat-up device includes multiple heald frames driven by a cam mechanism, wherein the cam mechanism causes the heald frames to move up and down.

[0031] A working cycle of the relevant warp yarn is defined as one up-and-down movement or one down-and-up movement of the warp yarn, specifically achieved by driving the heald frame.

[0032] Please see Figures 1 to 7 , Figure 1 This is a schematic diagram of the drive device for the loom of the present invention; Figure 2 This is a schematic diagram of the second drive subsystem of the present invention for driving the reed seat to swing. Figure 3 This is a schematic diagram of the cam mechanism (without housing) of the first drive subsystem of the gear transmission device of the present invention with a transmission ratio of 1:2; Figure 4 for Figure 3 Side view of the cam mechanism; Figure 5 for Figure 4 Top view of the cam mechanism; Figure 6 This is a schematic diagram of the cam mechanism (without housing) of the first drive subsystem of the gear transmission device of the present invention, which has a transmission ratio of 1:2.5. Figure 7 This is a schematic diagram of the cam mechanism (without housing) of the first drive subsystem of the gear transmission device of the present invention, which has a transmission ratio of 1:3.

[0033] like Figure 1 As shown, the drive device of the loom of the present invention includes a main drive shaft 2, a first drive subsystem 10 for driving the sheathing device 11 to move the warp yarns up and down, and a second drive subsystem 20 for driving the reed seat 21 to swing.

[0034] The first drive subsystem 10 includes a first drive shaft 12 for driving the opening device 11. During the weaving operation, the first drive shaft 12 is connected to the main drive shaft 2 via a first gear 3 and a second gear 4, and the first drive shaft 12 rotates at half the weaving speed.

[0035] The second drive subsystem 20 includes a second drive shaft 23. During weaving operations, the second drive shaft 23 is connected to the main drive shaft 2 via a third gear 5 and a first gear 3. The second drive subsystem 20 includes a reed rod unit 24 that is oscillating around a reed rod shaft 25, and a reed drive unit 26 for driving the reed rod unit 24. The reed 22 is mounted on the reed shaft 28 via a mounting component 27, which is fixedly connected to or integrally formed with the reed rod shaft 25. The reed drive unit 26 includes a first reed conjugate cam 30 and a second reed conjugate cam 31, which are mounted on the second drive shaft 23 and rotate with it. The reed rod unit 24 includes two cam followers, designated as the first cam follower 32 and the second cam follower 33. Each cam follower is associated with and driven by one of the two reed first conjugate cams 30 and 31. Specifically, one first cam follower 32 is associated with and driven by one reed first conjugate cam 30, and the other second cam follower 33 is associated with and driven by the other reed second conjugate cam 31. During the weaving operation, the second drive shaft 23 rotates at half the weaving speed.

[0036] Figure 2 The second drive subsystem 20 is shown in a schematic side view, as follows: Figure 1 and Figure 2 As shown, the second drive subsystem 20 is used to drive the reed holder 21 to swing around the reed holder shaft 25, as... Figure 2 The arrow in the diagram illustrates this. Figure 2 In the diagram, the reed support rod unit 24 is schematically represented by two lines. From Figure 2 As can be seen in more detail, the first conjugate cam 30 of the reed seat in the second drive subsystem 20 has two convex angles, and the second conjugate cam 31 of the reed seat has four convex angles. Each convex angle of the first conjugate cam 30 is within half the circumference of the cam profile of the first conjugate cam 30, and two adjacent convex angles of the second conjugate cam 31 are within half the circumference of the cam profile of the second conjugate cam 31. The profile design of the first conjugate cam 30 and the second conjugate cam 31 of the reed seat in the second drive subsystem 20 ensures that the reed rod unit 24 (schematically shown) completes two working cycles when the second drive shaft 23 rotates one revolution.

[0037] Figures 3 to 5 Showing Figure 1 A first embodiment of the first drive subsystem 10. The first drive subsystem 10 includes a first drive shaft 12 and an opening device 11 with a cam mechanism 40. In some embodiments, the opening device 11 further includes... Figures 3 to 5 Covers not shown in the image are used to cover the cam mechanism 40. The cam mechanism 40 includes a camshaft 50 (see...). Figure 5The device includes several cam pairs 42 connected to the camshaft 50, and several rocker arms 41. The rocker arms 41 are rotatable about an axis 47. In some embodiments, the sheathing device 11 includes heald frames (not shown) for moving the warp yarns up and down, wherein each rocker arm 41 drives one heald frame. The cam pairs are mounted on the camshaft. In some embodiments, the cam pairs are integrally formed with the camshaft. In other embodiments, at least some, and particularly all, of the cam pairs are separately manufactured and mounted to the camshaft.

[0038] Preferably, the number of cam pairs in the drive system is equal to the number of heald frames on the loom used with it.

[0039] In a preferred embodiment of the drive system, the number of rockers is equal to the number of cam pairs. The rockers are driven to rotate back and forth by their respective cam pairs, thereby moving the warp yarns up and down to form the shed. Specifically, in some embodiments, the rockers are connected to the heald frame, and the back-and-forth rotation of the rockers causes the heald frame to move up and down.

[0040] In some implementations, the cam pair and / or the camshaft with the cam pair are interchangeable, so that by changing the cam pair and / or the camshaft with the cam pair, the drive system can be used to weave different weaving patterns.

[0041] like Figure 4 As shown, each rocker arm 41 is equipped with two cam followers, namely a first cam follower 43 and a second cam follower 44. Each cam pair 42 includes two conjugate cams, namely a heald frame first conjugate cam 45 and a heald frame second conjugate cam 46. Each cam follower is associated with and driven by one of the heald frame first conjugate cams 45 and second conjugate cams 46 in the relevant cam pair 42. That is, one first cam follower 43 is associated with and driven by one heald frame first conjugate cam 45 in the relevant cam pair 42, and the other second cam follower 44 is associated with and driven by the other heald frame second conjugate cam 46 in the relevant cam pair 42.

[0042] like Figure 5 As shown, in Figures 3 to 5 In the first embodiment shown, the number of cam pairs 42 in the cam mechanism 40 is even; for example, the cam mechanism 40 has four cam pairs 42. In other embodiments, the cam mechanism may have two cam pairs.

[0043] Figures 3 to 5The cam mechanism 40 shown includes a camshaft 50 and four cam pairs 42, each of which has two conjugate cams, namely a first conjugate cam 45 and a second conjugate cam 46, mounted on the camshaft 50. The camshaft 50 is connected to the first drive shaft 12. The camshaft 50 is connected to the first drive shaft 12 via a gear transmission 51, preferably a bevel gear transmission including a first bevel gear 52 and a second bevel gear 53. The gear transmission ratio of the gear transmission 51 is 1:2, therefore the pitch circle radius of the second bevel gear 53 is twice that of the first bevel gear 52. Thus, the camshaft 50 rotates at half the speed of the first drive shaft 12. Here, the transmission ratio between the camshaft and the first drive shaft is 1:n, meaning that for every one revolution of the camshaft, the first drive shaft rotates n revolutions.

[0044] In this embodiment, the cam pair is mounted on the camshaft. In some embodiments, the cam pair and the camshaft are integrally formed. In other embodiments, at least some of the cam pairs (particularly all the cams) are manufactured separately and then mounted onto the camshaft. In some embodiments, the cam pairs and / or the camshaft with the cam pairs are replaceable, so that the drive system can be used to weave different weaves.

[0045] The first drive subsystem drives the shedding device, specifically causing the warp yarns to move up and down to form a shed. The first drive subsystem includes a first drive shaft and a cam mechanism, which in some embodiments is part of the shedding device.

[0046] exist Figure 4 and Figure 5 In this embodiment, both the first conjugate cam 45 and the second conjugate cam 46 of the heald frame in the cam pair 42 have two convex angles. The cam profiles (e.g.) of the first conjugate cam 45 and the second conjugate cam 46 of the heald frame in each cam pair 42 are selected such that the rocker arm 41 completes two working cycles when the camshaft 50 rotates once. In this case, the gear ratio of the gear transmission device 51 is 1:2, and when the first drive shaft 12 rotates at half the weaving speed, the camshaft 50 rotates at one-quarter of the weaving speed. In other words, if the first drive shaft 12 rotates at half the weaving speed, it takes four weaving cycles for the camshaft to complete one revolution. Therefore, since both the first conjugate cam 45 and the second conjugate cam 46 of the heald frame in the cam pair 42 have two convex angles, each rocker arm 41 is driven for half a working cycle in one weaving cycle, which means that the heald frame connected to the rocker arm will produce an upward or downward movement in one direction. Therefore, Figures 3 to 5 The cam profiles of the first conjugate cam 45 and the second conjugate cam 46 of the heald frame shown have two convex angles, and the two pairs of cams are offset by 90°, which can achieve 1 / 1 interlacing.

[0047] Figures 3 to 5The cam mechanism 40 shown, in which the camshaft 50 requires four weaving cycles to complete one revolution, can be configured with cam profiles of different numbers and distributions of convex angles. In particular, the cam profiles can be selected to achieve 1 / 1 interlacing, 1 / 3 interlacing, 2 / 2 interlacing, or 3 / 1 interlacing; in other words, an interlacing structure that repeats four times can be woven.

[0048] Figure 6 A second implementation of the first drive subsystem is shown, in which the cam mechanism 40 is configured to weave a 4 / 1 or 1 / 4 interlacing (i.e., interlacing repeated five times). This embodiment is similar to... Figure 5 The difference in this embodiment is that the third and fourth bevel gears have different dimensions, which causes a corresponding change in the position and dimensions of the first drive shaft and its mounting. The rest are the same. Figure 5 The implementation method is the same. According to... Figure 6 In the illustrated embodiment, the camshaft 50 is connected to the first drive shaft 12 via a gear transmission 51 (particularly a bevel gear transmission consisting of a third bevel gear 54 and a fourth bevel gear 55). The gear transmission 51 has a transmission ratio of 1:2.5, so the pitch circle of the fourth bevel gear 55 is 2.5 times that of the third bevel gear 54. In this case, when the first drive shaft 12 rotates at half the weaving speed, the camshaft 50 rotates at one-fifth of the weaving speed. In other words, when the first drive shaft 12 rotates at half the weaving speed, the camshaft requires five weaving cycles to complete one revolution. This allows for five repetitions of weaving, and the cam profile can be configured according to the desired weaving pattern.

[0049] Figure 7 A third implementation of the first drive subsystem is shown, in which the cam mechanism 40 is configured to weave a 5 / 1 or 1 / 5 interlacing (i.e., interlacing repeated six times), etc. This embodiment is similar to... Figure 5 The difference in this embodiment is that the fifth and sixth bevel gears have different dimensions, which causes a corresponding change in the position and dimensions of the first drive shaft and its mounting. The rest are the same. Figure 5 The implementation method is the same. According to... Figure 7 In the illustrated embodiment, the camshaft 50 is connected to the first drive shaft 12 via a gear transmission 51 (particularly a bevel gear transmission consisting of a fifth bevel gear 56 and a sixth bevel gear 57). The gear transmission 51 has a transmission ratio of 1:3, so the pitch circle of the sixth bevel gear 57 is three times that of the fifth bevel gear 56. In this case, when the first drive shaft 12 rotates at half the weaving speed, the camshaft 50 rotates at one-sixth of the weaving speed. In other words, when the first drive shaft 12 rotates at half the weaving speed, the camshaft requires six weaving cycles to complete one revolution. This allows for six repeated weaving cycles, and the cam profile can be configured according to the desired weaving pattern.

[0050] The loom drive device of the present invention uses a single drive system to weave several different interlacing patterns. This drive system is used to move the warp yarns up and down and drive the reed, even when the second drive subsystem for driving the reed is selected such that the reed bar unit completes two working cycles when the second drive shaft 23 rotates once. With the loom drive system of the present invention, while the second drive shaft of the loom maintains its original rotational speed, the reed of the loom will generate two weft insertions, directly doubling the weft insertion rate of the loom, thus doubling the production efficiency.

[0051] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0052] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications and variations to the above embodiments within the scope of the present invention.

Claims

1. A driving device of a loom, characterized by comprising: The driving device of the loom comprises a main driving shaft (2), a first driving subsystem (10) for driving the shedding device (11) to move the warp yarns up and down, and a second driving subsystem (20) for driving the sley (21) to swing, wherein the first driving subsystem (10) comprises a first driving shaft (12) and a cam mechanism (40), the cam mechanism comprises a cam shaft (50) and at least two cam pairs (42), each of the cam pairs (42) comprises a harness first conjugate cam (45) and a harness second conjugate cam (46), the harness first conjugate cam (45) and the harness second conjugate cam (46) are both mounted on the cam shaft (50), in the weaving operation, the first driving shaft (12) is connected with the main driving shaft (2), the cam shaft (50) is connected with the first driving shaft (12), the first driving shaft (12) rotates at half of the weaving speed, and the cam shaft (50) is connected with the first driving shaft (12) through a gear transmission device (51) selected from the group consisting of a gear transmission device (51) with a transmission ratio of 1:2, 1:2.5 and 1:3, and the harness first conjugate cam (45) and the harness second conjugate cam (46) in the cam pair (42) both have two lobes, wherein the cam profiles of the harness first conjugate cam (45) and the harness second conjugate cam (46) are configured such that the cam shaft (50) performs two working cycles for each revolution of the cam shaft (50).

2. The driving device of the loom according to claim 1, wherein The cam mechanism (40) comprises a plurality of rocker arms (41), wherein the number of the rocker arms (41) is equal to the number of the cam pairs (42).

3. The loom driving device according to claim 2, wherein Each of the rocker arms (41) cooperates with a first cam follower (43) and a second cam follower (44), and the first cam follower (43) and the second cam follower (44) are respectively and one-to-one drivingly connected with the harness first conjugate cam (45) and the harness second conjugate cam (46) in a cam pair (42).

4. The loom driving device according to claim 1, wherein The cam mechanism (40) has an even number of cam pairs (42).

5. The loom driving device according to claim 1, wherein The cam mechanism (40) has two or four cam pairs (42).

6. The loom driving device according to claim 1, wherein The cam shaft (50) is connected with the first driving shaft (12) through the gear transmission device (51) comprising two meshing connected bevel gears.

7. The loom driving device according to claim 1, wherein The second driving subsystem (20) comprises a second driving shaft (23) connected with the main driving shaft (2) in the weaving operation, wherein the second driving subsystem (20) comprises a sley bar unit (24) swingably arranged around a sley bar shaft (25), and a sley driving unit (26) for driving the sley bar unit (24), the sley driving unit (26) comprises a sley first conjugate cam (30) and a sley second conjugate cam (31), the sley first conjugate cam (30) and the sley second conjugate cam (31) are both mounted on the second driving shaft (23) and rotate with the second driving shaft (23), and the sley bar unit (24) comprises a first cam follower (32) and a second cam follower (33), the first cam follower (32) and the second cam follower (33) are respectively in one-to-one driving connection with the sley first conjugate cam (30) and the sley second conjugate cam (31).

8. The driving device of the loom according to claim 7, wherein The second driving shaft (23) rotates at half the speed of the loom, and the sley first conjugate cam (30) of the second driving subsystem (20) has two lobes, the sley second conjugate cam (31) has four lobes, each lobe of the sley first conjugate cam (30) extends within half the circumference of the cam profile of the sley first conjugate cam, and the two adjacent lobes of the sley second conjugate cam (31) extend within half the circumference of the cam profile of the sley second conjugate cam (31).

9. The loom driving device according to claim 8, wherein The cam profiles of the sley first conjugate cam (30) and the sley second conjugate cam (31) of the second driving subsystem (20) are configured such that the sley bar unit (24) completes two working cycles when the second driving shaft (23) rotates one circle.

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