Rubber band breakage and knotting detection mechanism and production device of bedspread with rubber band

Abstract

The utility model discloses a rubber band breakage and knotting detection mechanism and a production device of a bedspread with a rubber band, and belongs to the technical field of medical supplies. The detection mechanism comprises a control module, a fixed part, a detection part, a guide plate, a rotating arm, a middle microswitch and a photoelectric sensor; the rotating arm abuts against an elastic trigger piece of the middle microswitch and gradually gets close to the guide plate from top to bottom, the upper end of the rotating arm is hinged to the detection part, the lower end of the rotating arm abuts against the rear side of the rubber band, and the rotating arm is arranged on the upper portion of the detection part. The photoelectric sensor is positioned right behind the rubber band, faces the rubber band and is arranged at the lower part of the detection part; a notch is formed in the guide plate and is over against the photoelectric sensor; the middle microswitch and the photoelectric sensor are electrically connected with the control module; the rubber band enters from the top of the detection part, slides along the rear side of the guide plate and is output from the bottom of the detection part; if the rubber band is knotted, the rotating arm rotates backwards to trigger the middle microswitch; if the rubber band is broken, the broken rubber band can be detected by the photoelectric sensor.

Description

Technical Field

[0001] This utility model belongs to the field of medical supplies technology, and specifically relates to a mechanism for detecting elastic band breakage and knotting, and a production device for elastic band-integrated bed covers, used to prepare disposable bed covers. Background Technology

[0002] Disposable bed sheets are a common product in medical, beauty, and hygiene products, with wide applications and significant market demand growth. Currently, all products on the market are handmade, using a process that is not suitable for mechanized mass production, resulting in low production efficiency and high labor costs. Given the current surge in labor costs, there is an urgent need to improve production processes, achieve mechanized production, increase capacity, and reduce costs.

[0003] Existing technologies provide automated production equipment for bedspreads. For example, patent application number CN202210274676.4 provides a preparation device for disposable bedspreads, including a feeding structure, an elastic band traction structure, an upper folding structure, an ultrasonic continuous edge sealing structure, a lower folding structure, a V-shaped ultrasonic edge sealing structure, a V-shaped roller cutting structure, an M-fold structure, and a slitting structure arranged sequentially from front to back. The elastic band traction structure feeds two elastic bands to the upper side of the left and right sides of the fabric respectively. The upper folding structure is used to fold the left and right sides of the fabric upwards to form upper folds to cover the corresponding elastic bands. The lower folding structure is used to... The left and right sides of the fabric are folded down to form a lower flange. The V-shaped ultrasonic sealing structure is used to form an outward-facing V-shaped seal on the left and right sides of the fabric and the corresponding lower flange. The V-shaped roller cutting structure is used to roll cut on the left and right sides of the fabric and inside the V-shaped seal to form a V-shaped opening that matches the V-shaped seal. The ultrasonic continuous sealing structure is used to press the inner end of the upper flange onto the fabric. The inner end of the V-shaped seal is located inside the elastic band, and the weld point on the elastic band is denser than the weld points at other locations. The V-shaped opening is located outside the elastic band. The slitting structure is used to slit the fabric and elastic band at the V-shaped opening.

[0004] In existing technology, the elastic band needs to be ultrasonically welded to the fabric at the inner end of the V-shaped seal. If the fabric knots, the knotted area becomes larger, and ultrasonic welding (which can also cut the fabric) may directly sever the elastic band. Severing the elastic band not only causes the product to lose its elasticity but also prevents the production equipment from continuing to operate (the tension of the elastic band is needed to feed the fabric backward as required). Utility Model Content

[0005] To address the aforementioned problems, this utility model provides a mechanism for detecting broken and knotted elastic bands and a production device for elastic-covered bedspreads. The mechanism automatically detects broken or knotted elastic bands and issues an audible and visual alarm if any breakage or knot is detected. The technical solution is as follows:

[0006] On one hand, this utility model embodiment provides a rubber band breakage and knot detection mechanism, including a control module, a fixing part 2, a detection part 1 vertically arranged on the fixing part 2, a guide plate 11 arranged in front of the detection part 1 along its direction, a rotating arm 3 at the rear of the detection part 1, a micro switch 4 directly behind the rotating arm 3, and a photoelectric sensor 5 at the rear of the detection part 1. The micro switch 4 is disposed on the detection part 1 or the fixing part 2. The rear side of the rotating arm 3 abuts against the front side of the elastic trigger piece 6 of the micro switch 4, and gradually approaches the guide plate 11 from top to bottom. Its upper end is located behind the rubber band 7 and hinged to the detection part 1, and its lower end abuts against the rear side of the rubber band 7. The photoelectric sensor 5 is located at the top of the detection unit 1 and is positioned directly behind and facing the elastic band 7. It is located at the bottom of the detection unit 1. A notch 8 is provided on the guide plate 11 and directly opposite the photoelectric sensor 5. The micro switch 4 and the photoelectric sensor 5 are both electrically connected to the control module, which can provide audible and / or visual alarms. The elastic band 7 enters from the top of the detection unit 1, slides along the rear side of the guide plate 11, passes between the guide plate 11 and the lower end of the rotating arm 3, and exits from the bottom of the detection unit 1. If the elastic band 7 is knotted, the rotating arm 3 rotates backward to trigger the micro switch 4. If the elastic band 7 is broken, it will be detected by the photoelectric sensor 5.

[0007] Specifically, in this embodiment of the present invention, the detection part 1 and the fixing part 2 are both arranged in the front-back direction. The fixing part 2 is located on the upper rear side of the detection part 1 and forms an L-shaped plate with the detection part 1. The guide plate 11, the rotating arm 3 and the photoelectric sensor 5 are simultaneously located on the left or right side of the detection part 1. The micro switch 4 is located on the left or right side of the fixing part 2 and is located on the same side as the rotating arm 3.

[0008] Furthermore, the detection mechanism in this embodiment of the present invention also includes a transparent cover plate; the transparent cover plate is arranged side by side with the detection part 1, and the upper end of the rotating arm 3 is rotatably mounted on the detection part 1 via a left-right rotating shaft 9; a fixed boss 10 is provided at the rear of the detection part 1; the fixed boss 10 is parallel to the guide plate 11, located below and behind the rotating arm 3, and its side away from the detection part 1 is flush with the side of the guide plate 11 away from the detection part 1; the rotating arm 3 and the elastic trigger plate 6 are both located between the detection part 1 and the transparent cover plate; the transparent cover plate is located in front of the micro switch 4, its front part is fixed to the side of the guide plate 11 away from the detection part 1 by a fixing bolt 18, and its rear part is fixed to the end of the rotating shaft 9; the photoelectric sensor 5 is fixed on the fixed boss 10.

[0009] Specifically, in this embodiment of the present invention, the detection unit 1 is arranged obliquely from top to bottom and rearward. The guide plate 11, the rotating arm 3 and the photoelectric sensor 5 are located on the side of the detection unit 1 away from the fabric. The guide plate 11 and the fixed boss 10 are located at the front and rear ends of the detection unit 1, respectively. The upper rear end and the lower rear end of the guide plate 11 are both rounded.

[0010] Furthermore, in this embodiment of the present invention, the rear part of the fixing part 2 is provided with a circular hole for the fixing rod 12 to pass through in the left and right direction; the fixing rod 12 is provided on the rubber band traction structure in the left and right direction, and the fixing rod 12 passes through the circular hole and is locked by the locking bolt 19 on the fixing part 2.

[0011] Specifically, in this embodiment of the present invention, the rotating arm 3 is an isosceles trapezoidal plate that is larger at the top and smaller at the bottom.

[0012] On the other hand, this utility model embodiment also provides a production device for a bed sheet with elastic bands, including a feeding structure, an elastic band traction structure, an upper flanging structure, an ultrasonic continuous edge sealing structure, a lower flanging structure, a V-shaped ultrasonic edge sealing structure, a V-shaped roller cutting structure, an M-fold structure, and a slitting structure arranged sequentially from front to back. The elastic band traction structure feeds two elastic bands 7 to the upper side of the left and right sides of the fabric respectively; the elastic band traction structure includes two elastic band traction units, which are located on the left and right sides of the fabric respectively; the elastic bands... The traction unit includes a support 13, a conveying roller 16 on the support 13, and an elastic band cylinder 14 on the front side of the support 13. The elastic band traction structure also includes the aforementioned elastic band breakage and knot detection mechanism 15, which is located on the upper part of the support 13, above and behind the elastic band cylinder 14, and above and in front of the conveying roller 16. The elastic band 7 is output from the elastic band cylinder 14, first passes upward through the elastic band breakage and knot detection mechanism 15, then downward to the conveying roller 16, and finally is conveyed backward by the conveying roller 16.

[0013] In this embodiment of the invention, the support 13 includes two side plates arranged side by side and a fixing rod 12 between them; the conveying rollers 16 and the elastic band tubes 14 are both arranged in the left-right direction, the conveying rollers 16 are located between the two side plates and their two ends are respectively located on the two side plates, the fixing rod 12 is located above and in front of the conveying rollers 16 and its left and right ends are respectively fixed to the two side plates; an L-shaped rod 17 is provided on the lower front side of one side plate; the horizontal bar of the L-shaped rod 17 is arranged in the left-right direction and is located in front of the support 13; the rear end of the vertical bar of the L-shaped rod 17 is fixed to the front side of one side plate, and its front end is fixedly connected to the corresponding end of the horizontal bar; the elastic band tubes 14 are suspended on the horizontal bar.

[0014] Specifically, in this embodiment of the invention, the elastic band breakage and knot detection mechanism 15 is angularly adjustable and located in the middle of the fixed rod 12; the rear end of the longitudinal rod is fixed to the side plate near the fabric.

[0015] In this embodiment of the present invention, the conveying roller 16 includes a rubber roller and a drive roller arranged side by side. Both the rubber roller and the drive roller are arranged in the left-right direction and are located between two side plates. The rubber roller can be adjusted up and down. The motor of the drive roller is located on the side plate away from the fabric. The elastic band 7 passes through the rubber roller and the drive roller.

[0016] The beneficial effects of the technical solution provided by this utility model embodiment are as follows: This utility model embodiment provides a rubber band breakage and knot detection mechanism and a production device for a bed cover with rubber bands. The rubber band breakage and knot detection mechanism can automatically detect breakage and knots. If a breakage or knot occurs, it will issue an audible and visual alarm (it can also control the production device for the bed cover with rubber bands to stop working as needed). At the same time, the structure of this rubber band breakage and knot detection mechanism is compact and easy to maintain. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the elastic band breakage and knot detection mechanism provided in this embodiment of the utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the elastic band traction unit provided in this embodiment of the utility model.

[0019] In the diagram: 1. Detection section, 2. Fixing section, 3. Rotating arm, 4. Micro switch, 5. Photoelectric sensor, 6. Elastic trigger plate, 7. Rubber band, 8. Notch, 9. Rotating shaft, 10. Fixing boss, 11. Guide plate, 12. Fixing rod, 13. Bracket, 14. Rubber band cylinder, 15. Rubber band breakage and knot detection mechanism, 16. Conveying rollers, 17. L-shaped rod, 18. Fixing bolt, 19. Locking bolt. Detailed Implementation

[0020] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0021] Example 1

[0022] See Figure 1Example 1 provides a mechanism for detecting elastic band breakage and knotting, including a control module, a fixing part 2, a detection part 1, a guide plate 11, a rotating arm 3, a micro switch 4, a fixing boss 10, and a photoelectric sensor 5. The fixing part 2 is fixed to the elastic band traction unit. The detection part 1 is vertically arranged, but can be slightly tilted, and is located on the fixing part 2, specifically angled backward from top to bottom (tilt angle 15-45°). The guide plate 11 is located at the front left or front right side of the detection part 1, along the direction of the detection part 1, specifically at the front end of the detection part 1, and can be a rectangular strip. Preferably, the upper rear end and the lower rear end of the guide plate 11 are rounded. The rotating arm 3 is located at the left or right rear of the detection unit 1, above the detection unit 1. Its rear side abuts against the front of the elastic trigger plate 6 of the micro switch 4 (the lower part of which can rotate backward to trigger the micro switch 4). It gradually approaches the guide plate 11 from top to bottom. Its upper end is located behind the elastic band 7 and hinged to the detection unit 1 (specifically, the upper rear end). Its lower end abuts against the rear of the elastic band 7. It is specifically an isosceles trapezoidal plate, wider at the top and narrower at the bottom, and its lower part can rotate backward. The micro switch 4 is located on the detection unit 1 or the fixing unit 2, directly behind the rotating arm 3. The fixing boss 10 is parallel to the guide plate 11 and is located below and behind the rotating arm 3. It is located at the left or right rear of the detection unit 1, below the detection unit 1, and is specifically a rectangular block. Specifically, the fixing boss 10 is located at the rear end of the detection unit 1. The photoelectric sensor 5 is located directly behind and facing the elastic band 7, and is mounted on the fixed boss 10. The guide plate 11, rotating arm 3, and fixed boss 10 are simultaneously located on the left or right side of the detection part 1. The micro switch 4 is located on the left or right side of the fixed part 2, and is on the same side as the rotating arm 3. A notch 8 (specifically a rectangular opening) is provided on the guide plate 11 directly opposite the photoelectric sensor 5. The control module has a conventional structure, specifically a microcontroller or PLC, etc., which is omitted in detail in this embodiment. It can provide audible and / or visual alarms. Both the micro switch 4 and the photoelectric sensor 5 are electrically connected to the control module.

[0023] The elastic band 7 enters from the top of the detection unit 1, slides along the rear side of the guide plate 11, passes between the guide plate 11 and the lower end of the rotating arm 3, and exits from the bottom of the detection unit 1. If the elastic band 7 is knotted, the rotating arm 3 rotates backward to trigger the micro switch 4, and the control module alarms. If the elastic band 7 breaks, it will be detected by the photoelectric sensor 5 (the light from the photoelectric sensor 5 will not be reflected by the elastic band 7 and will enter the notch 8), and the control module alarms.

[0024] Specifically, in this embodiment of the present invention, both the detection part 1 and the fixing part 2 are arranged in the front-rear direction, and the fixing part 2 is located on the upper rear side of the detection part 1 to form an L-shaped plate with the detection part 1.

[0025] Specifically, in this embodiment of the present invention, the guide plate 11, the rotating arm 3, and the fixed boss 10 are all located on the side of the detection unit 1 away from the fabric.

[0026] Further, see Figure 1 In this embodiment of the invention, the rear part of the fixing part 2 has a circular hole along the left-right direction for the fixing rod 12 to pass through. The circular hole is located above the micro switch 4. The fixing rod 12 is disposed on the rubber band traction structure along the left-right direction, and is specifically a smooth circular rod. The fixing rod 12 passes through the circular hole and is locked by the locking bolt 19 on the fixing part 2. Specifically, the locking bolt 19 is disposed at the top of the fixing part 2, perpendicular to the fixing rod 12, and its lower end abuts against the fixing rod 12. Loosening the locking bolt 19 allows adjustment of the angle between the rubber band breakage detection mechanism and the knot detection mechanism.

[0027] Example 2

[0028] Example 2 provides a mechanism for detecting elastic band breakage and knotting, which is basically the same as the structure of Example 1, except that the detection mechanism in this example also includes a transparent cover plate. The transparent cover plate is arranged side by side with the detection part 1, and its shape and size match the detection part 1. Specifically, it can be an acrylic plate. The upper end of the rotating arm 3 is rotatably mounted on the detection part 1 via a left-right rotating shaft 9. The side of the fixed boss 10 away from the detection part 1 is flush with the side of the guide plate 11 away from the detection part 1. The rotating arm 3 and the elastic trigger plate 6 are both located between the detection part 1 and the transparent cover plate. The transparent cover plate is located in front of the micro switch 4, and its front part is fixed to the side of the guide plate 11 away from the detection part 1 by fixing bolts 18 (specifically two bolts, which are arranged side by side in the direction of the guide plate 11). The upper part of the transparent cover plate is fixed to the end of the rotating shaft 9, and the lower part of the rear part abuts against the fixed boss 10.

[0029] Example 3

[0030] Example 3 provides a production apparatus for a bed sheet with elastic bands, including a feeding structure, an elastic band traction structure, an upper flanging structure, an ultrasonic continuous edge sealing structure, a lower flanging structure, a V-shaped ultrasonic edge sealing structure, a V-shaped roller cutting structure, an M-fold structure, and a slitting structure arranged sequentially from front to back. The elastic band traction structure feeds two elastic bands 7 to the upper sides of the left and right sides of the fabric, respectively. The elastic band traction structure includes two elastic band traction units, located on the left and right sides of the fabric, respectively. Each elastic band traction unit includes a support 13, a conveying roller 16 on the support 13, and an elastic band cylinder 14 on the front side of the support 13. The elastic band cylinder 14 is used to output the elastic bands 7, and the conveying roller 16 is used to convey the elastic bands 7 backward. The aforementioned structure is basically consistent with the description of the patent with application number CN202210274676.4, except that:

[0031] See Figure 2 The elastic band traction structure in this embodiment also includes the elastic band breakage and knot detection mechanism 15 disclosed in Embodiment 1 or 2. The elastic band breakage and knot detection mechanism 15 is located on the upper part of the support 13, specifically at the front of the upper part of the support 13, above and behind the elastic band cylinder 14, and above and in front of the conveying rollers 16. It is fixed to a fixed rod 12. The elastic band 7 is output from the elastic band cylinder 14, first passing upwards through the elastic band breakage and knot detection mechanism 15, then downwards to the conveying rollers 16, and finally conveyed backwards by the conveying rollers 16.

[0032] Among them, see Figure 2 The bracket 13 in this embodiment includes two side plates arranged side by side and a fixing rod 12 (one or more) between them. The side plates are arranged in the front-to-back direction. The conveying roller 16 and the elastic band tube 14 are both arranged in the left-to-right direction. The conveying roller 16 is located between the two side plates and its two ends are respectively located on the two side plates. One fixing rod 12 is located above and in front of the conveying roller 16, and its left and right ends are respectively fixed to the two side plates. An L-shaped rod 17 is provided on the lower front side of one side plate; the horizontal bar of the L-shaped rod 17 is arranged in the left-to-right direction and is located in front of the bracket 13. The rear end of the longitudinal bar (arranged in the front-to-back direction) of the L-shaped rod 17 is fixed to the front side of one side plate, and its front end is fixedly connected to the corresponding end (left end or right end) of the horizontal bar. The elastic band tube 14 is suspended on the horizontal bar.

[0033] Specifically, see Figure 2 In this embodiment of the utility model, the elastic band breakage and knot detection mechanism 15 is angularly adjustable (adjusted by loosening the locking bolt 19) and located in the middle of the fixing rod 12.

[0034] Preferably, in this embodiment of the invention, the rear end of the longitudinal bar is fixed to a side plate near the fabric.

[0035] Among them, see Figure 2 The conveying rollers 16 in this embodiment include a rubber roller and a drive roller arranged side by side, both arranged in a left-right direction and positioned between two side plates. The rubber roller is adjustable up and down; specifically, the side plates have vertically oriented slots, and sliding blocks are adjustable up and down on the slots; the left and right ends of the rubber roller are positioned on the corresponding sliding blocks. The motor of the drive roller is located on the side plate away from the fabric, and the elastic band 7 passes between the rubber roller and the drive roller.

[0036] Example 4

[0037] See Figure 2Example 4 provides a production device for a bed cover with elastic bands. Its structure is basically the same as that of Example 3, except that there are three fixing rods 12 in this example. Two of the fixing rods 12 (the elastic band breakage and knot detection mechanism 15 is located on the front fixing rod 12) are arranged side by side on the top of the bracket 13. The other fixing rod 12 (located directly above the rubber roller) is located between the upper parts of the two slides to ensure that the two slides are adjusted synchronously.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A mechanism for detecting elastic band breakage and knotting, characterized in that, The device includes a control module, a fixing part (2), a detection part (1) vertically arranged on the fixing part (2), a guide plate (11) arranged in front of the detection part (1) along its direction, a rotating arm (3) at the rear of the detection part (1), a micro switch (4) directly behind the rotating arm (3), and a photoelectric sensor (5) at the rear of the detection part (1). The micro switch (4) is located on the detection part (1) or the fixing part (2). The rear side of the rotating arm (3) abuts against the front side of the elastic trigger plate (6) of the micro switch (4), and gradually approaches from top to bottom. The guide plate (11) has its upper end located behind the elastic band (7) and hinged to the detection part (1), and its lower end resting against the rear side of the elastic band (7). It is located on the upper part of the detection part (1). The photoelectric sensor (5) is located directly behind the elastic band (7) and facing the elastic band (7). It is located on the lower part of the detection part (1). The guide plate (11) has a notch (8) facing the photoelectric sensor (5). The micro switch (4) and the photoelectric sensor (5) are both electrically connected to the control module. The control module can perform sound and / or light alarms. The rubber band (7) enters from the top of the detection unit (1), slides along the rear side of the guide plate (11), passes between the guide plate (11) and the lower end of the rotating arm (3), and is output from the bottom of the detection unit (1). If the rubber band (7) is knotted, the rotating arm (3) rotates backward to trigger the micro switch (4). If the rubber band (7) is broken, it will be detected by the photoelectric sensor (5).

2. The elastic band breakage and knot detection mechanism according to claim 1, characterized in that, The detection part (1) and the fixing part (2) are both arranged in the front-back direction. The fixing part (2) is located on the upper rear side of the detection part (1) and forms an L-shaped plate with the detection part (1). The guide plate (11), the rotating arm (3) and the photoelectric sensor (5) are simultaneously located on the left or right side of the detection part (1). The micro switch (4) is located on the left or right side of the fixing part (2) and is located on the same side as the rotating arm (3).

3. The elastic band breakage and knot detection mechanism according to claim 2, characterized in that, The detection mechanism also includes a transparent cover plate; the transparent cover plate is arranged side by side with the detection part (1), and the upper end of the rotating arm (3) is rotatably mounted on the detection part (1) via a left-right rotating shaft (9); a fixed boss (10) is provided at the rear of the detection part (1); the fixed boss (10) is parallel to the guide plate (11), located below the rear of the rotating arm (3), and its side away from the detection part (1) is flush with the side of the guide plate (11) away from the detection part (1); the rotating arm (3) and the elastic trigger plate (6) are both located between the detection part (1) and the transparent cover plate; the transparent cover plate is located in front of the micro switch (4), its front part is fixed to the side of the guide plate (11) away from the detection part (1) by a fixing bolt (18), and its rear part is fixed to the end of the rotating shaft (9); the photoelectric sensor (5) is fixed on the fixed boss (10).

4. The elastic band breakage and knot detection mechanism according to claim 3, characterized in that, The detection unit (1) is arranged obliquely from top to bottom and rearward. The guide plate (11), rotating arm (3) and photoelectric sensor (5) are located on the side of the detection unit (1) away from the fabric. The guide plate (11) and the fixed boss (10) are located at the front and rear ends of the detection unit (1) respectively. The upper rear end and the lower rear end of the guide plate (11) are both rounded.

5. The elastic band breakage and knot detection mechanism according to claim 2, characterized in that, The rear part of the fixing part (2) is provided with a round hole for the fixing rod (12) to pass through in the left and right direction; the fixing rod (12) is provided on the rubber band traction structure in the left and right direction, and the fixing rod (12) passes through the round hole and is locked by the locking bolt (19) on the fixing part (2).

6. The elastic band breakage and knot detection mechanism according to claim 1, characterized in that, The rotating arm (3) is an isosceles trapezoidal plate that is larger at the top and smaller at the bottom.

7. A production device for a bed cover with elastic bands, comprising a feeding structure, an elastic band traction structure, an upper flange structure, an ultrasonic continuous edge sealing structure, a lower flange structure, a V-shaped ultrasonic edge sealing structure, a V-shaped roller cutting structure, an M-fold structure and a slitting structure arranged from front to back, wherein the elastic band traction structure feeds two elastic bands (7) to the upper side of the left and right sides of the fabric respectively. The elastic band traction structure includes two elastic band traction units, which are located on the left and right sides of the fabric, respectively; the elastic band traction unit includes a support (13), a conveying roller (16) on the support (13), and an elastic band cylinder (14) on the front side of the support (13); characterized in that, The elastic band traction structure also includes an elastic band breakage and knot detection mechanism (15) as described in claim 6. The elastic band breakage and knot detection mechanism (15) is located on the upper part of the support (13), above and behind the elastic band cylinder (14), and above and in front of the conveying roller (16). The elastic band (7) is output from the elastic band cylinder (14), passes upward through the elastic band breakage and knot detection mechanism (15), then downward to the conveying roller (16), and finally is conveyed backward by the conveying roller (16).

8. The production apparatus for a bed sheet with elastic bands according to claim 7, characterized in that, The bracket (13) includes two side plates arranged side by side and a fixing rod (12) between them; the conveying roller (16) and the elastic tube (14) are both arranged in the left and right direction. The conveying roller (16) is located between the two side plates and its two ends are respectively located on the two side plates. The fixing rod (12) is located above the front of the conveying roller (16) and its left and right ends are respectively fixed to the two side plates; an L-shaped rod (17) is provided on the lower front side of one side plate; the horizontal bar of the L-shaped rod (17) is arranged in the left and right direction and is located in front of the bracket (13); the rear end of the vertical bar of the L-shaped rod (17) is fixed to the front side of one side plate, and its front end is fixedly connected to the corresponding end of the horizontal bar; the elastic tube (14) is suspended on the horizontal bar.

9. The production apparatus for a bed sheet with elastic bands according to claim 8, characterized in that, The elastic band breakage and knot detection mechanism (15) is angularly adjustable and located in the middle of the fixed rod (12); the rear end of the longitudinal rod is fixed to the side plate near the fabric.

10. The production apparatus for a bed cover with elastic bands according to claim 8, characterized in that, The conveying rollers (16) include a rubber roller and a drive roller arranged side by side. Both the rubber roller and the drive roller are arranged in the left-right direction and are located between two side plates. The rubber roller can be adjusted up and down. The motor of the drive roller is located on the side plate away from the fabric. The elastic band (7) passes through the rubber roller and the drive roller.

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