A correction device for a bag making machine

Abstract

This utility model discloses a correction device for a bag-making machine, including a frame, an adjustment mechanism, a detection mechanism, and parallel guide rollers. The adjustment mechanism includes correction guide rollers, an adjustment motor, and a linkage assembly. One end of the correction guide roller is connected to the frame, and the other end is connected to the linkage assembly. The adjustment motor is connected to the linkage assembly. The detection mechanism includes a laser sensor, a track, and a slider. The laser sensor is connected to the slider, and the slider is connected to the track. The parallel guide rollers are respectively positioned at corresponding positions before and after the correction guide rollers. The sensing surface of the laser sensor faces downward and corresponds vertically to the outer area of ​​the parallel guide rollers. This utility model uses a laser sensor for detection, has a simple and compact structure, does not require an infrared receiver, and is stable and reliable in operation.

Description

Technical Field

[0001] This utility model relates to a correction device for a bag making machine. Background Technology

[0002] The present invention relates to a correction device for a bag-making machine, which is installed on the plastic bag-making machine to detect whether the plastic film is in the center position. When the plastic film is detected to be off-center, it can be corrected by an adjustment mechanism.

[0003] In the bag-making process, a bag-making machine typically uses a conveying device to transport plastic film gaps to the sealing and cutting device. During this transport, the varying thickness of the plastic film can easily cause lateral deviation, severely impacting product quality. Utility model patent CN207890759U discloses a plastic film correction device, comprising a base and a drive mechanism. The base has a winding frame and an unwinding frame at both ends, and also includes an infrared transmitter and an infrared receiver capable of receiving signals emitted by the infrared receiver. Its problems include: firstly, a complex structure and high manufacturing cost; secondly, because an infrared receiver is required, and the receiver is a mirror-like surface located below the plastic film, dust generated during bag-making inevitably obstructs it, necessitating frequent machine shutdowns for cleaning, significantly impacting production efficiency. Summary of the Invention

[0004] The technical problem to be solved by this utility model is: to design a detection mechanism and an adjustment mechanism that can detect the presence or absence of plastic film. When the presence or absence of plastic film is detected, the adjustment mechanism can be controlled to tilt one end of the correction guide roller up and down, thereby correcting the walking state of the plastic film in a timely manner, thus providing a correction device for a bag making machine.

[0005] To achieve the above-mentioned technical objectives, the technical solution of this utility model is: a correction device for a bag-making machine, characterized in that: it includes a frame, an adjustment mechanism, a detection mechanism, and parallel guide rollers; the adjustment mechanism includes a correction guide roller, an adjustment motor, and a linkage component; one end of the correction guide roller is connected to the frame, and the other end of the correction guide roller is connected to the linkage component; the linkage component is connected to the adjustment motor; the detection mechanism includes a laser sensor, a track, and a slider; the laser sensor is connected to the slider, and the slider is connected to the track; the parallel guide rollers are respectively arranged at corresponding positions before and after the correction guide roller; the sensing surface of the laser sensor faces downward and corresponds vertically to the area outside the parallel guide roller.

[0006] At least two parallel guide rollers are provided, respectively located in front of and behind the correction guide roller. The parallel guide rollers can be round or square shafts, which can be rotatably mounted on the frame or fixedly mounted on the frame. The two parallel guide rollers are kept as parallel as possible. The parallel guide rollers are used to make the plastic film adhere tightly to the upper side of the correction guide roller, so as to increase the contact area between the packaging film and the correction guide roller.

[0007] The aforementioned guide roller has one end hinged or movably connected to the frame, and the other end connected to the adjustment mechanism. Driven by the adjustment mechanism, the guide roller can tilt in the vertical direction, thereby achieving the technical purpose of correction.

[0008] The laser sensor described above, due to the advantages of laser light such as high directionality, high monochromaticity, and high power, can achieve non-contact, long-distance detection with high measurement accuracy. It can detect the presence or absence of plastic film regardless of its color or whether it is transparent. Furthermore, the laser sensor has a simple structure, small size, and low cost.

[0009] The sensing surface of the laser sensor faces downwards and corresponds vertically to the area outside the parallel guide roller. This means the laser sensor's detection direction is from top to bottom, i.e., the laser sensor is positioned above the correction guide roller and the parallel guide roller. The area outside the parallel guide roller refers to the side furthest from the correction guide roller. For a parallel guide roller positioned in front of the correction guide roller, its front edge is the outer edge of the parallel guide roller described in this invention; for a parallel guide roller positioned behind the correction guide roller, its rear edge is the outer edge of the parallel guide roller described in this invention.

[0010] The aforementioned linkage is used to convert the rotational motion of the adjusting motor into the up-and-down movement of one end of the correction guide roller, so that the correction guide roller forms an inclined state with one end higher and the other end lower.

[0011] As a preferred technical solution, the linkage component is a lead screw, to which a nut is connected. The lead screw is connected to an adjusting motor, and the nut is connected to one end of the guiding roller. This design is simple in structure and low in cost; the up-and-down reciprocating movement of one end of the guiding roller can be achieved by controlling the forward and reverse rotation of the motor.

[0012] The regulating motor can be a DC motor, a stepper motor, or a servo motor.

[0013] As a preferred technical solution, the regulating motor is a stepper motor.

[0014] The stepper motor is connected to a driver and a controller. By programming the controller, the stepper motor can be made to stop rotating when it reaches a certain angle or number of revolutions. Limit switches can also be set at corresponding positions to limit the tilt of the guide roller. The driver and controller of the stepper motor are existing technologies and can be implemented by those skilled in the art without creative effort, so they will not be described in detail here.

[0015] As a preferred technical solution, a limit switch is also provided at the corresponding upper and lower positions of one end of the correction guide roller.

[0016] As a further improvement, a positioning screw is also provided on the slider for positioning the laser sensor in the left and right positions.

[0017] The advantages of this invention are as follows: Compared with the prior art, the laser sensor of this invention does not need to identify patterns and colors, nor does it need to identify the thickness of the plastic film. It only needs to detect whether there is a plastic film at the position corresponding to the laser sensor downwards to correct the movement position of the plastic film. Furthermore, this invention has a simple and compact structure, does not require a reflective receiving lens, and therefore does not require cleaning dust from the reflective lens. It is simple to operate, stable, and reliable. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structural principle of Embodiment 1 from the front and side.

[0019] Figure 2 This is a schematic diagram of the structural principle of Embodiment 1 on the left.

[0020] Figure 3 This is a top view schematic diagram of the structural principle of Embodiment 1;

[0021] Figure 4 , Figure 5 , Figure 6 This is a schematic diagram illustrating the working principle of Embodiment 1;

[0022] Figure 7 This is a schematic diagram of the structural principle of Embodiment 2 from the front and side.

[0023] In the diagram, 1--frame; 2--adjusting mechanism; 20--limit switch; 21--guide roller for correcting deviation; 22--adjusting motor; 23--linkage component; 24--nut; 26--fixing groove; 27--sliding groove; 28--sliding opening; 29--pin; 3--detection mechanism; 31--laser sensor; 32--track; 33--slider; 34--positioning screw; 35--bracket; 4--parallel guide roller; 5--plastic film. Detailed Implementation

[0024] To fully disclose this utility model, two embodiments are described below with reference to the accompanying drawings to illustrate the technical solution of this utility model. In the description of this utility model, Figure 1 The left side is the left side described in this utility model. Figure 1 The left and right directions are the left and right directions described in this utility model.

[0025] Example 1, as Figure 1 , Figure 2 , Figure 3As shown: The adjustment mechanism 2 of Embodiment 1 includes a 21-axis correction guide roller 21, an adjustment motor 22, and a linkage component 23; the detection mechanism 3 includes a laser sensor 31, a track 32, a slider 33, a positioning screw 34, and a bracket 35. A fixing groove 26 is installed on one side of the upper and lower middle part of the frame 1. The fixing groove 26 is a square body with a groove. The front and rear width of the groove is slightly larger than the diameter of the rotating shaft of the correction guide roller 21, and its depth is larger than the radius of the rotating shaft. On the other side of the frame 1 corresponding to the fixing groove 26, a rectangular opening is set to form a sliding opening 28. A sliding groove 27 is installed in the sliding opening 28. The sliding groove 27 is also a square body with a groove. The sliding groove 27 is slidably embedded in the sliding opening 28 and can slide up and down in the sliding opening 28. A nut 2 is installed on the upper part of the sliding groove 27. 4. An adjusting motor 22 is installed on the frame 1 above the sliding groove 27. The adjusting motor 22 is a stepper motor. A linkage 23, a lead screw, is connected to the motor shaft of the adjusting motor 22. The lead screw is connected to the adjusting motor 22 and connected to a nut 24. The nut 24 is installed on the sliding groove 27. When the adjusting motor 22 rotates, it drives the linkage 23 (i.e., the lead screw) to move the nut 24 and the sliding groove 27 up and down. A limit switch 20 is installed on the frame 1 at the positions corresponding to the upward and downward movement of the sliding groove 27. Limit switch 20 is a proximity switch that transmits a switching signal to the control system when sliding groove 27 approaches limit switch 20. A guide roller 21 is provided; this guide roller 21 is a common guide roller, mainly composed of a drum and a shaft. The shaft is mounted inside the drum via bearings, and its length extends beyond the drum on both the left and right sides. One end of the guide roller 21 (the left end of the shaft extending beyond the drum) is placed in the groove of the fixed groove 26, and the other end (the right end of the shaft) is placed in the groove of the sliding groove 27. Parallel guide rollers 4 are installed parallel to each other in front of and behind the guide roller 21. A circular shaft is provided, which can be fixedly or rotatably installed. A track 32 is installed on the outer side of the front parallel guide roller 4 (i.e., the front side of the parallel guide roller 4) at a position corresponding to the frame 1. The track 32 is a linear guide rail. A slider 33 is installed on the track 32, and a bracket 35 is installed on the slider 33. A laser sensor 31 is installed at the lower end of the bracket 35, with the detection surface of the laser sensor 31 facing downwards, and the laser sensor 31 is vertically aligned with the front position of the front parallel guide roller 4. The laser sensor 31 is positioned on the left side, and the target being detected is on the left side of the plastic film 5.

[0026] The working steps and working principle of Example 1 are as follows: Figure 4 , Figure 5 , Figure 6 As shown, the plastic film 5 passes through the bottom side of the front parallel guide roller 4, then winds upwards to the top side of the correction guide roller 21, then winds backwards to the bottom side of the rear parallel guide roller 4, and then enters the sealing and cutting device of the bag making machine. Afterwards, the positioning screw 34 is loosened, and the slider 33 is pushed so that the laser sensor 31 aligns with the left edge of the plastic film 5 in the left-right lateral direction, forming a shape as seen from the side view. Figure 4 The state shown, viewed from the left side, forms as follows: Figure 5 The state shown, viewed from above, forms as follows: Figure 6 The state is shown. Then, the machine is turned on. After the machine is turned on, the plastic film 5 moves from front to back. During the movement, when the laser sensor 31 detects the presence of the plastic film 5, that is, when the light emitted by the laser sensor 31 is blocked by the plastic film 5, the adjusting motor 22 (stepper motor) immediately drives the linkage 23, i.e., the lead screw, to rotate, causing the sliding groove 27 to slide downward within the sliding opening 28. When the sliding groove 27 slides to a position close to the limit switch 20, the limit switch 20 will transmit a command to the control system to stop the adjusting motor 22 from rotating. During the downward sliding and stopping of the sliding groove 27, the right end of the guiding roller 21 tilts downward under its own weight and the pull of the plastic film 5. This creates a situation where the left side is higher than the right side, causing the plastic film 5 to shift to the right. When the plastic film 5 shifts to the right to the extent that the laser sensor 31 can no longer detect its presence, the adjusting motor 22 reverses. After the adjusting motor 22 reverses, the guiding roller 21 tilts upwards, creating a situation where the right side is higher than the left side. This tilted guiding roller 21 then causes the plastic film 5 to shift to the left. When the left side of the plastic film 5 shifts to the position that can block the laser sensor 31, the adjusting motor 22 reverses again. This process repeats, causing the left side of the plastic film 5 to swing left and right to the position corresponding to the downward movement of the laser sensor 31, thereby achieving the technical purpose of correcting the plastic film deviation in the bag making machine.

[0027] Example 2, as Figure 7 As shown, the difference between Embodiment 2 and Embodiment 1 is that one end of the guiding roller 21 is hinged to one side of the frame 1 by a pin 29, and the other end of the guiding roller 21 is also connected to the nut 24 by a pin 29. The nut 24 is connected to the linkage 23, i.e., the lead screw. The other structures and working principles of Embodiment 2 are basically the same as those of Embodiment 1, and their working steps and working principles are also basically the same, so they will not be described again here.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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 this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] The embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A deviation correcting device of a bag making machine, characterized by: The system includes a frame (1), an adjustment mechanism (2), a detection mechanism (3), and parallel guide rollers (4). The adjustment mechanism (2) includes a correction guide roller (21), an adjustment motor (22), and a linkage (23). One end of the correction guide roller (21) is connected to the frame (1), and the other end of the correction guide roller (21) is connected to the linkage (23). The linkage (23) is connected to the adjustment motor (22). The detection mechanism (3) includes a laser sensor (31), a track (32), a slider (33), and a bracket (35). The laser sensor (31) is connected to the slider (33), and the slider (33) is connected to the track (32). The parallel guide rollers (4) are respectively set at corresponding positions before and after the correction guide roller (21). The laser sensor (31) is connected to the bracket (35) and corresponds vertically to the area outside the parallel guide rollers (4).

2. A deviation rectifying device of a bag making machine according to claim 1, characterized in that: The linkage (23) is a lead screw, and a nut (24) is also connected to the lead screw.

3. A deviation correcting device of a bag making machine according to claim 1, characterized in that: The regulating motor (22) is a stepper motor.

4. A deviation correcting device of a bag making machine according to claim 1, characterized in that: Limit switches (20) are also provided at corresponding positions at one end of the correction guide roller (21).

5. A deviation correcting device of a bag making machine according to claim 1, characterized in that: The slider (33) is also provided with a positioning screw (34).

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