Roving supply stop device for a spinning frame

Abstract

Provided is a roving supply stop device for a spinning frame that can shorten the time required to stop the supply of roving. The roving supply stop device (30) is provided with a apron guide roller (25) disposed upstream of the intermediate bottom roller (12a) and downstream of the back bottom roller (14a) in the moving direction (X) of the roving (F) in the drafting device (10). The intermediate bottom apron (21) is lapped onto the apron guide roller (25) at a position that is distanced from the intermediate bottom roller (12a) to the upstream side in the moving direction (X).

Description

Technical Field

[0001] This invention relates to a roving supply stop device for a spinning frame. Background Technology

[0002] A spinning frame drafts roving using a drafting device. Furthermore, the spinning frame includes a roving supply stop device that stops the supply of roving to the drafting device in the event of a yarn breakage. As an example of a roving supply stop device, the roving supply stop device for a ring spinning frame disclosed in Patent Document 1 can be cited.

[0003] Patent Document 1 discloses a roving supply stopping device comprising a first support plate and a second support plate disposed on a push plate of a drive assembly. A first arc-shaped wedge is disposed on the first support plate. Furthermore, a second arc-shaped wedge is disposed on the second support plate. The first arc-shaped wedge engages with the circumferential surface of the rear roller, and the second arc-shaped wedge engages with the circumferential surface of the intermediate roller.

[0004] In a ring spinning frame, when the roving supply stop device is not in the supply stop state, the first arc-shaped wedge is not in contact with the roving, and the second arc-shaped wedge is not in contact with the lower belt. Thus, the roving is conveyed.

[0005] In the event of a yarn breakage or other necessitating a roving supply stop, the drive assembly pulls the push plate upwards. This causes the second arc-shaped wedge to rotate counter-clockwise relative to the middle roller and enter the space between the lower belt and the middle roller. Thus, the second arc-shaped wedge severs the contact between the lower belt and the middle roller. Consequently, the lower belt loses power from the middle roller and cannot rotate, stopping the roving feed. Furthermore, the first arc-shaped wedge enters the space between the rear roller and the roving, preventing further roving feed. Therefore, the roving supply is stopped by the roving supply stop device.

[0006] Patent Document 1: Chinese Utility Model Application No. 217399067 Specification

[0007] As with the roving supply stopping device disclosed in Patent Document 1, in order to stop the rotation of the lower belt, a second arc-shaped wedge needs to be inserted between the lower belt and the intermediate roller. The greater the amount of the second arc-shaped wedge inserted between the lower belt and the intermediate roller, the longer the time required for the rotation of the lower belt to stop. The longer the time required for the rotation of the lower belt to stop, the more roving is conveyed through the rotation of the lower belt, which is therefore not preferable. Summary of the Invention

[0008] A roving supply stopping device for a spinning frame designed to address the aforementioned problems is provided in the drafting unit. The drafting unit includes: a rear roller section comprising a rear lower roller and a rear upper roller; and an intermediate roller section comprising an intermediate lower roller and an intermediate upper roller, and also comprising an intermediate lower apron and an intermediate upper apron. The roving supply stopping device of the spinning frame includes: a rear roller engaging section that engages with the circumference of the rear lower roller, and a rear roller wedge section. The rear roller wedge section, by moving from the roving release position to the roving clamping position, engages between the rear lower roller and the rear upper roller, thereby blocking the transmission of rotation from the rear lower roller to the rear upper roller; and an intermediate roller engaging section that engages with the upper roller... The circumferential surface of the lower intermediate roller engages, and the lower intermediate roller wedge is provided. The lower intermediate roller wedge moves from the roving release position to the roving clamping position, thereby biting between the lower intermediate roller and the lower intermediate apron and blocking the transmission of rotation from the lower intermediate roller to the lower intermediate apron. The main feature of the roving supply stop device of the spinning frame is that it has an apron guide roller. The apron guide roller is arranged in the drafting device upstream of the lower intermediate roller and downstream of the lower rear roller in the roving movement direction. The lower intermediate apron is wound around the apron guide roller at a position upstream of the lower intermediate roller in the movement direction.

[0009] Accordingly, by setting a guide roller with a rubber ring, the amount of winding of the lower intermediate rubber ring relative to the lower intermediate roller can be reduced, and the amount of rotation of the intermediate roller engagement part during its movement from the roving release position to the roving clamping position can be reduced. Therefore, the time required for the intermediate roller engagement part to rotate in order to stop the roving supply can be shortened. As a result, during the period from the intermediate roller engagement part rotating from the roving release position to the roving clamping position—in other words, until the roving supply stops—the amount of roving fed through the drafting device can be reduced.

[0010] Alternatively, for a roving supply stop device for a spinning frame, the aforementioned apron guide roller has a support shaft and a roller component supported by the support shaft that is rotatable, the roller component having a craning shape.

[0011] Therefore, the lateral misalignment of the lower central rubber ring can be suppressed by the roller component.

[0012] Alternatively, for a roving supply stop device for a spinning machine, the roller component is a cylindrical resin molded article, and has a shape in which the inner diameter increases as it moves from the first end face to the second end face in the axial direction of the roller component. The curvature of the roller component at the middle of the axial direction near the first end face is different from the curvature of the roller component at the middle of the axial direction near the second end face, so that the thickness of the roller component at the first end face is the same as the thickness of the roller component at the second end face, and the top of the outer bulge shape is located at the middle of the axial direction of the roller component.

[0013] Therefore, even if the roller component has a shape in which the inner diameter increases as it moves from the first end face in the axial direction to the second end face, the movement of the roller component caused by the increase in the inner diameter can be suppressed.

[0014] Alternatively, for the roving supply stop device of the spinning machine, if the straight line connecting the clamping point of the roving formed by the rear roller and the clamping point of the roving formed by the middle roller is taken as an imaginary line, then the lower middle rubber ring is arranged such that it passes below the imaginary line.

[0015] Therefore, even if a guide roller with a rubber ring is placed between the middle lower roller and the rear lower roller, the path of the middle lower rubber ring will not be significantly changed, and thus the path of the roving will not be significantly changed.

[0016] This invention can shorten the time required to stop the supply of roving. Attached Figure Description

[0017] Figure 1 This is a schematic side view showing the drafting device and the roving supply stop device.

[0018] Figure 2 This is an enlarged side view showing the roving release position of the roving supply stop device.

[0019] Figure 3 This is a cross-sectional view showing the guide roller of the rubber band.

[0020] Figure 4 It is a perspective view showing a partial view of the roving supply stop device.

[0021] Figure 5 This is an enlarged side view of the roving supply stop device, showing the roving clamping position.

[0022] Figure 6 This is a partial side view of a comparative example of a roving supply stop device.

[0023] Explanation of reference numerals in the attached figures

[0024] M...Imaginary line; N1...Pinch point; N2...Pinch point; TR...Roller top; 10...Drafting device; 12...Middle roller section; 12a...Middle lower roller; 12b...Middle upper roller; 14...Rear roller section; 14a...Rear lower roller; 14b...Rear upper roller; 21...Middle lower apron; 22...Middle upper apron; 25...Apron guide roller; 25a...Support shaft; 26...Roller assembly; 26a...First end face; 26b...Second end face; 30...Roving supply stop device; 32...Rear roller locking part; 32a...Rear roller wedge; 42...Middle roller locking part; 42a...Middle roller wedge; 100...Spinning frame. Detailed Implementation

[0025] The following is based on Figures 1-6 An embodiment of a roving supply stop device for a spinning frame will be described.

[0026] <Spinning Frame>

[0027] like Figure 1 As shown, the spinning frame 100 includes a drafting device 10 and a roving supply stop device 30.

[0028] <Drafting device>

[0029] The drafting device 10 includes a front roller section 11, a middle roller section 12, and a rear roller section 14.

[0030] The front roller section 11 includes a front lower roller 11a and a front upper roller 11b.

[0031] The intermediate roller section 12 includes a lower intermediate roller 12a, an upper intermediate roller 12b, a lower intermediate apron 21, and an upper intermediate apron 22. Furthermore, the intermediate roller section 12 includes a lower guide section 23a, an upper guide section 23b, and an apron guide roller 25. The apron guide roller 25 includes a support shaft 25a and a roller component 26, which will be described in detail later. Alternatively, the apron guide roller 25 may be a structural component of the roving supply stop device 30.

[0032] like Figure 2 As shown, the lower intermediate apron 21 is wound around the lower guide portion 23a and the apron guide roller 25, and slides in contact with the lower intermediate roller 12a. The upper intermediate apron 22 is wound around the upper intermediate roller 12b and the upper guide portion 23b. The clamping point N1 for the roving F formed by the intermediate roller portion 12 is formed between the lower intermediate apron 21 and the upper intermediate apron 22.

[0033] The rear roller section 14 includes a rear lower roller 14a and a rear upper roller 14b. A clamping point N2 for the roving F, formed by the rear roller section 14, is located between the rear lower roller 14a and the rear upper roller 14b. The roving F moves from the clamping point N2 of the rear roller section 14 towards the clamping point N1 of the intermediate roller section 12. If the straight line connecting the clamping point N2 of the rear roller section 14 and the clamping point N1 of the intermediate roller section 12 is defined as an imaginary line M, then the roving F moves along the imaginary line M. Furthermore, the imaginary line M is aligned with the roving F; therefore, in… Figure 2 In the figure, only the leader line of the reference numeral [M] is shown by a double-dotted line.

[0034] like Figure 1 As shown, the front lower roller 11a is supported by roller seat 15. The middle lower roller 12a is supported by roller seat 15 via middle lower roller support 16 and is rotatable. Furthermore, the support shaft 25a of the belt guide roller 25 is supported by roller seat 15 via roller support 27. The rear lower roller 14a is supported by roller seat 15 via rear lower roller support 17 and is rotatable. The front lower roller 11a, middle lower roller 12a, and rear lower roller 14a are each rotated by a drive source (not shown). The rotation of the front lower roller 11a is transmitted to the front upper roller 11b. Furthermore, the rotation of the middle lower roller 12a is transmitted to the middle upper roller 12b via middle lower belt 21 and middle upper belt 22. The rotation of the rear lower roller 14a is transmitted to the rear upper roller 14b.

[0035] The weighted arm 18 is supported by a bracket 19a and is rotatable relative to the support shaft 19 of the supported roller seat 15. The front upper roller 11b, the middle upper roller 12b, and the rear upper roller 14b are each supported by the weighted arm 18 via an upper roller support body (not shown).

[0036] A support rod 20a extends along the rear lower roller 14a from the side of the bracket 19a. A trumpet head 20b for guiding the roving F is fixed on the support rod 20a. The roving F is supplied from a roving spool suspended on a roving frame (not shown) to the rear roller section 14 via the trumpet head 20b, and then to the drafting device 10.

[0037] <Middle Roller Section>

[0038] The intermediate roller section 12 will be described in detail. In addition, the direction in which the roving F moves from the rear roller section 14 to the front roller section 11 is defined as the movement direction X of the roving F in the drafting device 10.

[0039] like Figure 2 As shown, the guide roller 25 is positioned upstream of the middle lower roller 12a and downstream of the rear lower roller 14a in the direction of movement X of the roving F.

[0040] In the direction of roving F's movement X, the apron guide roller 25 moves upstream away from the middle lower roller 12a. In the direction of roving F's movement X, the apron guide roller 25 moves downstream away from the rear lower roller 14a. Furthermore, in the direction of roving F's movement X, the apron guide roller 25 is positioned between the middle lower roller 12a and the rear lower roller 14a.

[0041] The guide roller 25 has a smaller diameter than the middle lower roller 12a and the rear lower roller 14a. The middle lower roller 12a and the rear lower roller 14a have the same diameter, but they can also have different diameters. The central axis L of the guide roller 25 is located on the side of the roving F that is closer to the center axis L1 of the middle lower roller 12a and the center axis L2 of the rear lower roller 14a.

[0042] like Figure 2 and Figure 3 As shown, the rubber ring guide roller 25 includes: a support shaft 25a supported by a roller support portion 27; and a roller member 26 that rotates relative to the support shaft 25a. In other words, the rubber ring guide roller 25 includes a support shaft 25a and a roller member 26 that is rotatable and supported by the support shaft 25a.

[0043] Roller component 26 is a cylindrical resin molded article with an outer bulge shape. One of the two end faces of roller component 26 extending axially along its central axis L3 has a first end face 26a, and the other end face has a second end face 26b. The outer diameter of the outer bulge-shaped roller component 26 is largest at the middle of its axial direction. Therefore, the tip of the outer bulge shape is located at the middle of the axial direction of roller component 26. Furthermore, the tip TR of the rubber ring guide roller 25 is located at the middle of the axial direction of roller component 26. The outer diameter of roller component 26 gradually decreases from the middle of the axial direction towards the first end face 26a, and also gradually decreases from the middle of the axial direction towards the second end face 26b.

[0044] Approaching the second end face 26b from the first end face 26a, the inner diameter of the roller component 26 expands. The expansion of the roller component 26 is due to the draft angle generated by the forming jig (not shown) used to pull out the roller component 26 from the inside of the roller component 26 in order to form the roller component 26 into a cylindrical shape.

[0045] The roller member 26, having the aforementioned inner and outer diameters, has the same thickness at the first end face 26a and the second end face 26b. Therefore, in the roller member 26, the curvature of the portion extending from both ends to the middle along the axial direction is different on both sides of the axial direction. In other words, in the roller member 26, the curvature of the portion of the roller member 26 closer to the first end face 26a than the middle of the axial direction is different from the curvature of the portion closer to the second end face 26b than the middle of the axial direction. The inner diameter is larger closer to the second end face 26b; therefore, the curvature of the portion of the roller member 26 closer to the second end face 26b than the middle of the axial direction is smaller than the curvature of the portion of the roller member 26 closer to the first end face 26a than the middle of the axial direction.

[0046] like Figure 2 and Figure 4 As shown, the lower intermediate rubber ring 21 is wound around the lower guide portion 23a and the roller member 26 of the rubber ring guide roller 25, sandwiching the lower intermediate roller 12a between the lower guide portion 23a and the roller member 26 of the rubber ring guide roller 25. The lower guide portion 23a guides the shape of the lower intermediate rubber ring 21 in such a way that although the lower intermediate roller 12a is disposed between the lower guide portion 23a and the rubber ring guide roller 25, the lower intermediate rubber ring 21 is wound around the rubber ring guide roller 25. Specifically, the lower guide portion 23a has a portion that extends diagonally across the movement direction X, and the size of the diagonally crossing portion is larger than the diameter of the lower intermediate roller 12a. More specifically, the upper end 23T of the lower guide portion 23a is located in front of the imaginary line M, and the lower end 23E of the lower guide portion 23a is located below the lower end of the lower intermediate roller 12a. Therefore, the lower intermediate rubber ring 21 is wound around the rubber ring guide roller 25 from the position where it sandwiches the lower intermediate roller 12a in the vertical direction, due to the lower guide portion 23a. The lower guide portion 23a can adjust the tension of the lower intermediate rubber ring 21. Moreover, the lower intermediate rubber ring 21 is wound around the rubber ring guide roller 25 at a position upstream in the movement direction X, away from the lower intermediate roller 12a.

[0047] like Figure 3 As shown, the lower central rubber ring 21 is wound around the roller component 26 in such a way that the center of the lower central rubber ring 21 in the width direction is located at the roller tip TR of the rubber ring guide roller 25 due to the outward bulging shape of the roller component 26.

[0048] like Figure 2 and Figure 4 As shown, the upper end, i.e., the tip TM, of the lower intermediate roller 12a slides in line contact with the inner circumferential surface of the lower intermediate rubber ring 21. Therefore, the lower intermediate rubber ring 21 does not wrap around the circumferential surface of the lower intermediate roller 12a in an arc shape. Therefore, the rubber ring guide roller 25 is positioned to prevent the lower intermediate rubber ring 21 from wrapping around the circumferential surface of the lower intermediate roller 12a.

[0049] In the roller component 26 of the guide roller 25, the roller tip TR is located below the imaginary line M. Therefore, the middle lower rubber ring 21, which is wound around the guide roller 25 and the lower guide portion 23a, slides in contact with the tip TM of the middle lower roller 12a.

[0050] <Roving supply stop device>

[0051] like Figure 1 and Figure 2 As shown, the roving supply stop device 30 provided in the drafting device 10 includes a rear roller stop component 31, an intermediate roller stop component 41, the aforementioned rubber guide roller 25, a driving force transmission component 36, and a switching device 37.

[0052] The rear roller stop component 31 has a rear roller engagement portion 32 that is curved in an arc shape and a connecting portion 33 that extends from the rear roller engagement portion 32 in a plate shape. The rear roller stop component 31 does not rotate integrally with the rear lower roller 14a.

[0053] The rear roller engaging portion 32 engages with the rear lower roller 14a in a circumferential manner, covering a portion of its circumferential surface. The end of the arc of the rear roller engaging portion 32 furthest from the guide roller 25 is the rear roller wedge 32a. The rear roller wedge 32a can engage between the rear lower roller 14a and the rear upper roller 14b. The thickness of the rear roller wedge 32a is thinner than the thickness of other parts of the rear roller engaging portion 32, and it becomes thinner towards the end; therefore, the rear roller wedge 32a easily engages between the rear lower roller 14a and the rear upper roller 14b.

[0054] The intermediate roller stop component 41 includes an intermediate roller engagement portion 42 curved in an arc shape and a connecting portion 43 extending from the intermediate roller engagement portion 42. The intermediate roller stop component 41 does not rotate integrally with the intermediate lower roller 12a. The intermediate roller engagement portion 42 engages with the circumferential surface of the intermediate lower roller 12a in a manner that covers a portion of the circumference of the intermediate lower roller 12a. The end of the arc-shaped intermediate roller engagement portion 42 closest to the guide roller 25 is the intermediate roller wedge portion 42a. The intermediate roller wedge portion 42a can engage between the intermediate lower roller 12a and the intermediate lower rubber ring 21. The thickness of the intermediate roller wedge portion 42a is thinner than the thickness of other parts of the intermediate roller engagement portion 42, and it becomes thinner towards the end, therefore, the intermediate roller wedge portion 42a easily engages between the intermediate lower roller 12a and the intermediate lower rubber ring 21.

[0055] In the intermediate roller engagement portion 42, the intermediate roller wedge portion 42a is located between the intermediate lower roller 12a and the roller component 26 of the rubber ring guide roller 25.

[0056] The drive force transmission member 36 is connected to the rear roller stop member 31 and the intermediate roller stop member 41 in a swingable manner. The drive force transmission member 36 transmits the drive force of the switching device 37 to the rear roller stop member 31 and the intermediate roller stop member 41.

[0057] The driving force transmission component 36 is a long plate extending along the moving direction X of the roving F. Furthermore, the connecting portion 43 of the intermediate roller stop component 41 is connected to the end portion of the driving force transmission component 36, and the connecting portion 33 of the rear roller stop component 31 is connected at a position closer to the base end of the intermediate roller stop component 41. The switching device 37 is connected to the base end of the driving force transmission component 36. The switching device 37 is, for example, a cylinder. In addition, the switching device 37 is electrically connected to a yarn breakage sensor (not shown) and a control device. If the yarn breakage sensor detects a yarn breakage in the roving F, it outputs a detection signal to the control device.

[0058] The switching device 37 is controlled by a control device based on the detection signal from the yarn breakage sensor. If the control device receives the detection signal from the yarn breakage sensor, it drives the switching device 37, causing the driving force transmission component 36 to move. The position of the driving force transmission component 36 when the switching device 37 is driven due to the yarn breakage sensor detection signal is... Figure 5 The roving clamping position P1 is shown. When the driving force transmission component 36 is in the roving clamping position P1, the positions of the rear roller stop component 31 and the middle roller stop component 41 are also the roving clamping position P1.

[0059] The control device does not activate the switching device 37 when it does not receive a detection signal from the yarn breakage sensor. The position of the drive force transmission component 36 when the switching device 37 is not activated is... Figure 2 The roving release position P2 is shown. When the drive force transmission component 36 is in the roving release position P2, the positions of the rear roller stop component 31 and the middle roller stop component 41 are also the roving release position P2. Furthermore, the structure of the drive force transmission component 36 and the switching device 37 is not particularly limited. In short, as long as the rear roller stop component 31 and the middle roller stop component 41 can be switched between the roving clamping position P1 and the roving release position P2 based on the detection signal from the yarn breakage sensor, the drive force transmission component 36 and the switching device 37 can also be appropriately modified.

[0060] <Roving release position>

[0061] like Figure 2 As shown, at the roving release position P2, the rear roller wedge 32a of the rear roller engaging portion 32 does not engage between the rear lower roller 14a and the rear upper roller 14b. Furthermore, at the roving release position P2, the rear roller wedge 32a is not in contact with the roving F.

[0062] Furthermore, at the roving release position P2, the middle roller wedge 42a of the middle roller engagement portion 42 does not engage between the middle lower roller 12a and the middle lower apron 21. Moreover, at the roving release position P2, the middle roller wedge 42a and the middle lower apron 21 are not in contact.

[0063] Furthermore, the end of the intermediate roller wedge 42a is positioned slightly away from the clamping point N1 of the intermediate roller 12 in a clockwise direction from the intermediate lower roller 12a. Specifically, the end of the intermediate roller wedge 42a is located near the top TM of the intermediate lower rubber ring 21. Moreover, the top TM of the intermediate lower rubber ring 21 forms the clamping point N1 of the intermediate roller 12; therefore, the end of the intermediate roller wedge 42a is located near the clamping point N1 of the intermediate roller 12. Furthermore, the end of the intermediate roller wedge 42a is located directly below the inner circumferential surface of the intermediate lower rubber ring 21 at a position where it does not contact the inner circumferential surface of the intermediate lower rubber ring 21. Specifically, the end of the intermediate roller wedge 42a is directly below the imaginary line M.

[0064] <Roving clamping position>

[0065] like Figure 5 As shown, at the roving clamping position P1, the rear roller wedge 32a of the rear roller engaging portion 32 engages between the rear lower roller 14a and the rear upper roller 14b. This blocks the transmission of rotation from the rear lower roller 14a to the rear upper roller 14b. Therefore, the rear roller wedge 32a of the rear roller engaging portion 32 moves from the roving release position P2 to the roving clamping position P1, thereby engaging between the rear lower roller 14a and the rear upper roller 14b and blocking the transmission of rotation from the rear lower roller 14a to the rear upper roller 14b. Furthermore, at the roving clamping position P1, the rear roller wedge 32a contacts the roving F. Thus, the rear roller wedge 32a and the rear upper roller 14b together clamp the roving F.

[0066] Furthermore, at the roving clamping position P1, the intermediate roller wedge 42a of the intermediate roller engagement portion 42 engages between the intermediate lower roller 12a and the intermediate lower apron 21. This blocks the transmission of rotation from the intermediate lower roller 12a to the intermediate lower apron 21. Therefore, the intermediate roller wedge 42a of the intermediate roller engagement portion 42 moves from the roving release position P2 to the roving clamping position P1, thereby engaging between the intermediate lower roller 12a and the intermediate lower apron 21 and blocking the transmission of rotation from the intermediate lower roller 12a to the intermediate lower apron 21. Furthermore, at the roving clamping position P1, the intermediate roller wedge 42a contacts the intermediate lower apron 21. And the end of the intermediate roller wedge 42a is located at the tip TM of the intermediate lower roller 12a, which forms the clamping point N1 of the intermediate roller portion 12. Thus, the roving F is clamped between the intermediate upper apron 22 and the intermediate lower apron 21. Figure 2As shown, the amount by which the end of the intermediate roller wedge 42a moves from the roving release position P2 to the roving clamping position P1 is the rotation amount R1 of the intermediate roller engaging part 42.

[0067] <Comparative Example>

[0068] like Figure 6 As shown, in the comparative example of the roving supply stop device 70 located at the roving release position P2, the lower intermediate apron 21 is wound around the lower intermediate roller 12a, the lower guide portion 23a, and the tension roller 60 positioned below the lower intermediate roller 12a. In the comparative example of the roving supply stop device 70, the lower intermediate apron 21 is wound in an arc shape along the circumference of the lower intermediate roller 12a.

[0069] Therefore, the amount of winding of the lower intermediate rubber ring 21 relative to the lower intermediate roller 12a in the comparative example is greater than that in the embodiment. In other words, in the roving supply stop device 30 of the embodiment, the amount of winding of the lower intermediate rubber ring 21 relative to the lower intermediate roller 12a is reduced by providing the rubber ring guide roller 25.

[0070] Furthermore, at the roving release position P2, the middle roller wedge 42a is not in contact with the middle lower apron 21; therefore, the middle roller wedge 42a is positioned away from the middle lower apron 21. In other words, the middle roller wedge 42a is positioned away from the middle lower apron 21 in a clockwise direction around the middle lower roller 12a.

[0071] Although not illustrated, in the comparative example, at the roving clamping position P1, the intermediate roller wedge 42a engages between the intermediate lower roller 12a and the intermediate lower apron 21, and engages until the tip TM of the intermediate lower roller 12a forms the clamping point N1. In the comparative example, the amount by which the end of the intermediate roller wedge 42a moves from the roving release position P2 to the roving clamping position P1 is the rotation amount R2 of the intermediate roller engagement portion 42. The intermediate lower apron 21 is wound around the intermediate lower roller 12a; therefore, the rotation amount R2 in the comparative example is greater than the rotation amount R1 in the embodiment. In other words, in the roving supply stop device 30 of the embodiment, by providing the apron guide roller 25, the rotation amount R1 of the intermediate roller engagement portion 42 is reduced.

[0072] <The Role of the Implementation Method>

[0073] Next, the function of this embodiment will be explained.

[0074] like Figure 2As shown, in the non-broken yarn state, the rear roller stop component 31 and the middle roller stop component 41 are held at the roving release position P2 via the drive force transmission component 36 and the switching device 37. Furthermore, the non-broken yarn state refers not only to the state where the roving F is supplied to the drafting device 10 via the trumpet head 20b for spinning, but also to the state where the roving F has not yet been supplied to the drafting device 10 before spinning begins. In the state before spinning begins, even if the yarn breakage sensor does not detect yarn, the control device does not determine that it is a yarn breakage and does not perform the action of driving the drive force transmission component 36 to the roving clamping position P1 via the switching device 37.

[0075] When the spinning frame 100 starts operating, the roving F supplied from the roving spool suspended on the roving frame is guided to the trumpet head 20b and supplied to the rear roller section 14. The roving F supplied to the rear roller section 14 is drafted between the clamping point N2 of the rear roller section 14 and the clamping point N1 of the middle roller section 12. Furthermore, the roving F is drafted between the middle roller section 12 and the front roller section 11 to become roving. The roving becomes yarn and is wound into a bobbin via a guide hook (not shown) and a traveler.

[0076] If a yarn breakage occurs, the control device drives the switching device 37 based on the detection signal from the yarn breakage sensor. Driven by the switching device 37, the rear roller stop component 31 and the middle roller stop component 41 are swung from the roving release position P2 toward the roving clamping position P1 via the driving force transmission component 36.

[0077] Thus, as Figure 5 As shown, the rear roller wedge 32a engages between the rear upper roller 14b and the rear lower roller 14a, blocking the transmission of rotation from the rear lower roller 14a to the rear upper roller 14b. Thus, the conveying of the roving F stops.

[0078] Furthermore, the intermediate roller wedge 42a engages between the intermediate lower ring 21 and the intermediate lower roller 12a, blocking the rotational transmission from the intermediate lower roller 12a to the intermediate lower ring 21. Thus, the rotation of the intermediate lower ring 21 stops.

[0079] Furthermore, the roving F, pulled by the drafting device 10, is cut between the rear roller section 14 and the middle roller section 12. Even if the drafting device 10 continues to drive, the transmission of rotation from the rear lower roller 14a to the rear upper roller 14b is blocked by the rear roller stop member 31, thus stopping the supply of roving F to the drafting device 10.

[0080] The following effects can be obtained from the above embodiments.

[0081] (1) By guiding the roller 25 with a rubber ring, the amount of winding of the lower intermediate rubber ring 21 relative to the lower intermediate roller 12a can be reduced, and the rotation amount R1 of the intermediate roller engagement part 42 can be reduced. Therefore, the time required for the intermediate roller engagement part 42 to rotate in order to stop the supply of roving F can be shortened. As a result, during the period when the intermediate roller engagement part 42 rotates from the roving release position P2 to the roving clamping position P1, in other words, until the supply of roving F stops, the amount of roving F delivered by the drafting device 10 can be reduced.

[0082] (2) The roller member 26 of the rubber ring guide roller 25 has an outward bulge shape, and therefore, the rubber ring guide roller 25 with roller member 26 has a roller tip TR. With such an outward bulge shape of roller member 26, the middle lower rubber ring 21 can be aligned with the roller member 26 and wound up, and the lateral misalignment of the middle lower rubber ring 21 can be suppressed.

[0083] (3) The roller component 26 is cylindrical in shape as a resin molded article, thus generating a draft angle during molding. Therefore, due to the draft angle, the roller component 26 has a shape that allows it to move easily along the support shaft 25a. Furthermore, the support shaft 25a of the rubber ring guide roller 25 supports multiple roller components 26, and an intermediate lower rubber ring 21 is wound around the roller component 26, thus allowing the support shaft 25a to flex easily.

[0084] The roller component 26 is asymmetrical in that it has an outward bulge shape on one side and the same thickness at both ends in the axial direction, resulting in different curvatures on both sides of the axial direction. As a result, lateral misalignment of the roller component 26 caused by the draft angle of the roller component 26 and the deflection of the support shaft 25a can be suppressed.

[0085] Therefore, there is no need for countermeasures such as machining to eliminate the draft angle of the roller component 26 or increasing the roller component 26 axially to make the roller components 26 contact each other in order to suppress lateral misalignment of the roller component 26. In addition, there is no need to worry about assembling the roller component 26 to the support shaft 25a in a way that counteracts the draft angle of the roller component 26 and the deflection of the support shaft 25a.

[0086] (4) The guide roller 25 is configured such that a portion of the lower intermediate apron 21 passes below the imaginary line M obtained by connecting the clamping point N1 of the intermediate roller section 12 and the clamping point N2 of the rear roller section 14. Therefore, even if the guide roller 25 is configured between the intermediate roller section 12 and the rear roller section 14, the path of the roving F will not be significantly changed due to the guide roller 25.

[0087] This embodiment can be modified as follows. This embodiment and the following modifications can be combined and implemented to the extent that they do not contradict each other technically.

[0088] The guide roller 25 can also be configured to partially pass through the imaginary line M of the lower central rubber ring 21, or it can be configured to partially pass through the area above the imaginary line M of the lower central rubber ring 21.

[0089] Alternatively, the roller component 26 can be bulging on one side and have different thicknesses at its two ends along the axial direction. In this case, the curvature on both sides of the roller component 26 along the axial direction can also be the same.

[0090] Alternatively, the outer diameter of the roller component 26 can be kept constant in the axial direction, without making the roller component 26 into an outward bulge shape.

[0091] Alternatively, roller component 26 can be made of metal.

[0092] Next, we will supplement the description with the technical ideas that can be grasped from the above implementation methods and other examples.

[0093] [Method 1]

[0094] A roving supply stopping device for a spinning frame is provided in a drafting device, the drafting device comprising: a rear roller section having a rear lower roller and a rear upper roller; and an intermediate roller section having an intermediate lower roller and an intermediate upper roller, and having an intermediate lower apron and an intermediate upper apron. The roving supply stopping device further comprises: a rear roller engaging section that engages with the circumference of the rear lower roller, and a rear roller wedge section, the rear roller wedge section moving from a roving release position to a roving clamping position to engage between the rear lower roller and the rear upper roller, thereby blocking the transmission of rotation from the rear lower roller to the rear upper roller; and an intermediate roller engaging section that engages with the intermediate lower roller and the rear upper roller. The roller engages on its circumferential surface and has a middle roller wedge. The middle roller wedge moves from the roving release position to the roving clamping position, thereby biting between the middle lower roller and the middle lower apron and blocking the transmission of rotation from the middle lower roller to the middle lower apron. The roving supply stopping device of the spinning frame is characterized by having an apron guide roller. The apron guide roller is arranged in the drafting device upstream of the middle lower roller and downstream of the rear lower roller in the roving movement direction. The middle lower apron is wound around the apron guide roller at a position upstream of the middle lower roller in the movement direction.

[0095] [Method 2]

[0096] In the roving supply stop device of the spinning frame described in Method 1, the aforementioned guide roller has a support shaft and a roller component supported by the support shaft and capable of rotation, the roller component having an outer drum shape.

[0097] [Method 3]

[0098] In the roving supply stop device of the spinning frame described in Method 2, the roller component is a cylindrical resin molded article, and has a shape in which the inner diameter increases as it moves from the first end face to the second end face in the axial direction of the roller component. The curvature of the roller component at the middle of the axial direction near the first end face is different from the curvature of the roller component at the middle of the axial direction near the second end face, so that the thickness of the roller component at the first end face is the same as the thickness of the roller component at the second end face, and the top of the outer bulge shape is located at the middle of the axial direction of the roller component.

[0099] [Method 4]

[0100] In the roving supply stop device of the spinning frame according to any one of the methods 1 to 3, if the straight line obtained by connecting the clamping point of the rear roller section for the roving and the clamping point of the intermediate roller section for the roving is taken as an imaginary line, then the intermediate lower rubber ring is arranged in such a way that it passes below the imaginary line.

Claims

1. A roving supply stop device for a spinning frame, disposed in a drafting device, the drafting device comprising: The rear roller section includes a lower rear roller and an upper rear roller; and The middle roller section includes a lower middle roller and a upper middle roller, and also includes a lower middle rubber ring and a upper middle rubber ring. The roving supply stop device of the spinning frame includes: A rear roller engaging portion engages with the circumferential surface of the rear lower roller and includes a rear roller wedge portion, which, by moving from a roving release position to a roving clamping position, bites between the rear lower roller and the rear upper roller, thereby blocking the rotational transmission from the rear lower roller to the rear upper roller; and The intermediate roller engaging portion engages with the circumferential surface of the intermediate lower roller and has an intermediate roller wedge portion. The intermediate roller wedge portion moves from the roving release position to the roving clamping position, thereby biting between the intermediate lower roller and the intermediate lower apron and blocking the rotational transmission from the intermediate lower roller to the intermediate lower apron. The roving supply stop device of the spinning frame is characterized in that... The drafting device includes a rubber apron guide roller, which is positioned upstream of the middle lower roller and downstream of the rear lower roller in the roving movement direction. The lower intermediate rubber ring is wound around the guide roller on the upstream side of the moving direction, away from the lower intermediate roller.

2. The roving supply stop device for a spinning frame according to claim 1, characterized in that, The guide roller has a support shaft and a roller component supported by the support shaft and capable of rotation, the roller component having an outer drum shape.

3. The roving supply stop device for a spinning frame according to claim 2, characterized in that, The roller component is a cylindrical resin molded article, and its inner diameter increases as it moves from the first end face to the second end face along the axial direction of the roller component. The curvature of the roller component at the middle of the axial direction near the first end face is different from the curvature of the roller component at the middle of the axial direction near the second end face, so that the thickness of the roller component at the first end face is the same as the thickness of the roller component at the second end face, and the top of the outer bulge shape is located at the middle of the axial direction of the roller component.

4. The roving supply stop device for a spinning frame according to any one of claims 1 to 3, characterized in that, If the straight line connecting the clamping point of the roving formed by the rear roller section and the clamping point of the roving formed by the middle roller section is taken as an imaginary line, then the guide roller is configured such that the lower middle rubber ring passes through a position below the imaginary line.

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