A synchronous reciprocating continuous feeding device for a cartoning machine

Abstract

The present application discloses a synchronous reciprocating continuous feeding device for a cartoning machine, which includes a frame, a number of feeding rods and a number of pressing devices. It also includes a sliding frame, a transverse moving carrier, a first actuating device, a longitudinal moving carrier and a second actuating device. During daily use, by adopting the above technical solution, the external conveyor belt does not stop running. The sliding frame cooperates with the transverse moving carrier and the first actuating device, so that the sliding frame carries each feeding rod and each pressing device to reciprocate along the direction of the external conveyor belt for conveying materials. When moving towards the discharging side, the second actuating device cooperates with the longitudinal moving carrier, so that each feeding rod extends above the external conveyor belt, and at the same time the pressing device descends to perform the feeding action. After the feeding action is completed, the second actuating device acts in the reverse direction, so that each feeding rod moves away from the external conveyor belt, and at the same time each pressing device rises. It can realize feeding while the external conveyor belt does not stop, improving the feeding efficiency.

Description

Technical Field

[0001] The present invention relates to a synchronous reciprocating continuous pusher device for a cartoning machine. Background Art

[0002] The pusher and presser device is a pusher and presser component on an automatic cartoning machine, and its purpose is to push the material and the instruction manual into the carton simultaneously.

[0003] For example, a Chinese invention patent with the publication number CN105857719B, a synchronous pusher and presser device for a cartoning machine, includes a pusher small swing arm, a presser small swing arm, a presser large swing arm, a pusher large swing arm, a pusher pull rod, a presser pull rod, a presser arm, and a pusher arm. The pusher small swing arm and the presser small swing arm both drive the presser large swing arm and the pusher large swing arm to perform reciprocating motions through chain drives. The structure is simple and can achieve reciprocating pusher actions. However, its existing defect is that:

[0004] The position of this pusher and presser device is fixed. When it performs the pusher action, the material conveying device needs to stop operating. After the pusher and presser device completes the pusher action and resets, the material conveying device operates again, resulting in low pusher efficiency. Summary of the Invention

[0005] The present invention aims to solve one of the technical problems existing in the prior art.

[0006] The present application provides a synchronous reciprocating continuous pusher device for a cartoning machine, including a frame, a plurality of pusher rods, and a plurality of pressing devices, and further including:

[0007] A sliding frame, which is used to carry each pusher rod and each pressing device;

[0008] A transverse moving carrier frame, which is driven by an actuating device one and is used to carry the sliding frame and can slide horizontally on the frame;

[0009] A longitudinal moving carrier frame, which is driven by an actuating device two and is used to enable each pusher rod to slide longitudinally on the sliding frame.

[0010] The transverse moving carrier frame includes:

[0011] A plurality of slide rails, which are parallel to each other and extend transversely;

[0012] A plurality of sliders, which are fixedly installed on the sliding frame and can slide on the corresponding slide rails.

[0013] The actuating device one includes:

[0014] A driven pulley one, which is rotatably installed at the bottom of the frame and is located at one end of the slide rail;

[0015] A driving pulley one, which is driven by a motor one and is in mutual transmission connection with the driven pulley one through a transmission belt one;

[0016] On one side of the first transmission belt, it is fixedly connected to the sliding frame through a connecting frame.

[0017] The longitudinal movement bearing frame includes:

[0018] A number of fixed blocks, fixedly installed on the sliding frame, all with sliding grooves;

[0019] A connecting sliding rod, parallel to each slide rail, and both ends can be slidably installed on the machine frame through a pair of longitudinal movement sliding grooves;

[0020] A number of sliding blocks, respectively fixedly installed at the inner ends of each pushing rod, and can all be slidably sleeved on the outer wall of the connecting sliding rod;

[0021] Among them, each pushing rod can be slidably installed in the corresponding sliding groove.

[0022] The second actuating device includes:

[0023] A pair of driven belt pulleys II, both can be rotatably installed on the side wall of the machine frame, respectively located at the same end of each longitudinal movement sliding groove, and are synchronously connected through a rotating shaft;

[0024] A pair of driven belt pulleys III, both can be rotatably installed on the side wall of the machine frame, respectively located at the other end of each longitudinal movement sliding groove, and are drivingly connected to the corresponding driven belt pulley II through a second transmission belt;

[0025] The driving belt pulley II, which is driven by the second motor, is drivingly connected to one of the driven belt pulleys II / driven belt pulleys III through a third transmission belt.

[0026] The material pressing device includes:

[0027] A flipping frame, the lower end of which can be rotatably installed on one side of the sliding frame through a pin shaft;

[0028] A straight-line cylinder, one end of which is hinged to the upper end of the flipping frame, and the other end is hinged to the opposite side of the sliding frame;

[0029] A material pressing frame, which is fixedly installed on the flipping frame and extends away from the sliding frame.

[0030] The pushing rod includes:

[0031] A rod body, the cross-section of which is rectangular, and both opposite side walls are provided with recessed grooves;

[0032] A pair of cooling cavities, arranged at intervals on both sides inside the rod body, extending along the length direction of the rod body, and the same end is penetrated;

[0033] A pair of return channels, arranged at intervals on both sides inside the rod body, respectively located below the corresponding cooling cavity, one end is penetrated, and the other end is connected to the non-penetrated end of the corresponding cooling cavity;

[0034] A cooling medium circulation device, comprising an outer box, a radiator, a circulation unit and a cooling medium, and is used to circulate the cooling medium in the outer box, a pair of cooling chambers and corresponding return channels;

[0035] Wherein, the cross-section of each sliding groove is adapted to the rod body with grooves.

[0036] The circulation unit includes:

[0037] A circulation pump, whose input end is connected to the outer box through a connecting pipe, and the output end is connected to each cooling chamber through an output pipe;

[0038] A return pipe, which is provided with an electromagnetic flow limiting valve and is connected to each return channel in the inner cavity of the outer box.

[0039] The push rod further includes:

[0040] A plurality of notches, which are arranged at intervals on the side wall of the rod body and extend along the length direction of the rod body;

[0041] A plurality of connecting holes, connecting each notch to the corresponding cooling chamber;

[0042] A plurality of high-density sponges, which are respectively embedded in each notch;

[0043] Wherein, the cooling medium is a lubricating fluid.

[0044] The push rod further includes:

[0045] A plurality of annular grooves, which are respectively arranged in the middle of each connecting hole;

[0046] A plurality of piston plates, which are respectively slidably installed at the end of each annular groove far from the notch;

[0047] A plurality of springs, which are respectively arranged between each piston plate and the end of the annular groove close to the notch;

[0048] A plurality of notches, which are arranged at intervals on the periphery of each piston plate. When the piston plate slides towards the corresponding notch, the lubricating fluid can enter the notch through the connecting hole, the annular groove and the notch.

[0049] The beneficial effects of the present invention are as follows:

[0050] 1. Through the setting of the sliding frame, the transverse moving carrier frame, the actuating device one, the longitudinal moving carrier frame and the actuating device two, each push rod and each pressing device can reciprocate parallelly along the external conveyor belt, realizing continuous pushing of materials without stopping the external conveyor belt, and improving work efficiency;

[0051] 2. By providing the rod body, a pair of cooling chambers, a pair of return channels, an outer box, a radiator, a cooling medium, a circulation pump, a return pipe, a connecting pipe, an output pipe, and an electromagnetic flow-limiting valve, the cooling medium can circulate between the cooling chambers, the return channels, and the outer box to cool the rod body and prevent high temperature from affecting the normal use of the rod body.

[0052] 3. By providing the notches, connecting holes, high-density sponges, annular grooves, piston plates, springs, notches, the circulation pump, the return pipe, a pair of cooling chambers, a pair of return channels, the connecting pipe, the output pipe, and the electromagnetic flow-limiting valve, the opening degree of the electromagnetic flow-limiting valve is controlled to increase the hydraulic pressure in the pair of cooling chambers, push open the piston plates, immerse the lubricating liquid into the high-density sponges, lubricate the surface of the rod body, and reduce the friction between the rod body and the corresponding sliding grooves. Description of the Drawings

[0053] Figure 1 It is an overall three-dimensional structure diagram of the synchronous reciprocating continuous feeding device on the cartoning machine cooperating with the external conveying device in the embodiment of the present application;

[0054] Figure 2 It is an overall three-dimensional structure diagram of the synchronous reciprocating continuous feeding device on the cartoning machine in the embodiment of the present application;

[0055] Figure 3 It is a bottom view of the synchronous reciprocating continuous feeding device on the cartoning machine in the embodiment of the present application;

[0056] Figure 4 It is a schematic diagram of the internal structure of the push rod in the embodiment of the present application;

[0057] Figure 5 It is a schematic diagram of the structure of the cooling medium circulation device in the embodiment of the present application.

[0058] Reference Signs

[0059] 1 - Frame, 2 - Pushing rod, 201 - Rod body, 202 - Cooling cavity, 203 - Return channel, 204 - Outer box, 205 - Radiator, 206 - Cooling medium, 207 - Notch, 208 - Connecting hole, 209 High - density sponge, 210 - Ring groove, 211 - Piston plate, 212 - Spring, 213 - Notch, 3 - Material pressing device, 301 - Flipping frame, 302 - Straight - acting cylinder, 303 - Material pressing frame, 4 - Sliding frame, 5 - Transverse moving carrier, 501 - Slide rail, 502 - Slide block, 6 - Actuating device one, 601 - Driven pulley one, 602 - Driving pulley one, 603 - Motor one, 604 - Driving belt one, 7 - Longitudinal moving carrier, 701 - Fixed block, 702 - Sliding groove, 703 - Connecting slide bar, 704 - Sliding block, 8 - Actuating device two, 801 - Driven pulley two, 802 - Rotating shaft, 803 - Driven pulley three, 804 - Driving pulley two, 805 - Motor two, 806 - Driving belt three, 807 - Driving belt two, 9 - Circulation unit, 901 - Circulation pump, 902 - Connecting pipe, 903 - Output pipe, 904 - Return pipe, 905 - Electromagnetic flow limiter valve, 901 - Circulation pump, 902 - Connecting pipe, 903 - Output pipe, 904 - Return pipe, 905 - Electromagnetic flow limiter valve. Detailed implementation mode

[0060] The following will clearly describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of them. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0061] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order different from those illustrated or described herein, and the objects distinguished by "first", "second", etc. generally belong to the same category, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally represents an "or" relationship between the associated objects before and after.

[0062] The following will describe in detail the server provided in the embodiments of the present application with reference to the accompanying drawings, through specific embodiments and their application scenarios.

[0063] Embodiment 1:

[0064] As Figures 1 to 2As shown in the figure, an embodiment of the present application provides a synchronous reciprocating continuous material pushing device for a cartoning machine, which includes a frame 1, a plurality of material pushing rods 2 and a plurality of material pressing devices 3, and further includes a sliding frame 4 for carrying each of the material pushing rods 2 and each of the material pressing devices 3; a transverse moving carrier 5 driven by an actuating device 1 6, for carrying the sliding frame 4 to slide horizontally on the frame 1; a longitudinal moving carrier 7 driven by an actuating device 2 8, for enabling each of the material pushing rods 2 to slide longitudinally on the sliding frame 4.

[0065] In this embodiment of the present application, due to the adoption of the above structure, the external conveyor belt does not stop running. The sliding frame 4 cooperates with the transverse moving carrier 5 and the actuating device 1 6 to make the sliding frame 4 carry each of the material pushing rods 2 and each of the material pressing devices 3 to reciprocate in the direction of conveying materials by the external conveyor belt. When moving towards the discharging side, the actuating device 2 8 cooperates with the longitudinal moving carrier 7 to make each of the material pushing rods 2 extend above the external conveyor belt, and at the same time the material pressing device 3 descends to perform the material pushing action. After completing the material pushing action, the actuating device 2 8 acts in the reverse direction to make each of the material pushing rods 2 move away from the external conveyor belt, and at the same time each of the material pressing devices 3 rises. Subsequently, the actuating device 1 6 runs in the reverse direction to make the transverse moving carrier 5, each of the material pushing rods 2 and each of the material pressing devices 3 move towards the feeding side of the external conveyor belt, so that each of the material pushing rods 2 and each of the material pressing devices 3 are aligned with the materials to be pushed, completing a material pushing cycle.

[0066] Embodiment 2:

[0067] As Figures 2 to 3 shown, in this embodiment, in addition to including the structural features of the foregoing embodiment, the transverse moving carrier 5 includes a plurality of slide rails 501, which are parallel to each other and extend transversely; a plurality of sliders 502, which are fixedly installed on the sliding frame 4 and can slide on the corresponding slide rails 501.

[0068] Furthermore, the actuating device 1 6 includes a driven pulley 1 601, which is rotatably installed at the bottom of the frame 1 and is located at one end of the slide rail 501; a driving pulley 1 602, which is driven by a motor 1 603 and is in mutual transmission connection with the driven pulley 1 601 through a transmission belt 1 604. One side of the transmission belt 1 604 is fixedly connected to the sliding frame 4 through a connecting frame.

[0069] Furthermore, the longitudinal moving carrier 7 includes a plurality of fixing blocks 701, which are fixedly installed on the sliding frame 4 and each has a sliding groove 702; a connecting slide rod 703, which is parallel to each of the slide rails 501, and both ends are slidably installed on the frame 1 through a pair of longitudinal moving chutes 609; a plurality of sliding blocks 704, which are respectively fixedly installed at the inner ends of each of the material pushing rods 2 and can all be slidably sleeved on the outer wall of the connecting slide rod 703, and each of the material pushing rods 2 can be slidably installed in the corresponding sliding groove 702.

[0070] Further, the second actuating device 8 includes a pair of driven pulleys II 801, both rotatably mounted on the side wall of the frame 1, respectively located at the same end of each longitudinal movement chute 609, and synchronously connected to each other through a rotating shaft 802; a pair of driven pulleys III 803, both rotatably mounted on the side wall of the frame 1, respectively located at the other end of each longitudinal movement chute 609, and drivingly connected to the corresponding driven pulley II 801 through a transmission belt II 807; a driving pulley II 804, driven by a motor II 805, and drivingly connected to one of the driven pulleys II 801 / driven pulley III 803 through a transmission belt III 806.

[0071] Further, the blank holding device 3 includes a turning frame 301, the lower end of which is rotatably mounted on one side of the sliding frame 4 through a pin shaft; a linear cylinder 302, one end of which is hinged to the upper end of the turning frame 301, and the other end is hinged to the opposite side of the sliding frame 4; a blank holding frame 303, which is fixedly mounted on the turning frame 301 and extends away from the sliding frame 4.

[0072] In this embodiment of the present application, due to the adoption of the above structure, when it is necessary to move the sliding frame 4 along the extension direction of the external conveyor belt, the motor I 603 drives the driving pulley I 602 to rotate, drives the driven pulley I 601 to rotate through the transmission belt I 604, and at the same time drives the transverse movement carrier 5 to move through the connecting frame, and the corresponding slider 502 also slides on the corresponding slide rail 501;

[0073] When it is necessary to extend or retract one end of each pushing rod 2 outside or into the sliding frame 4, the motor II 805 drives the driving pulley II 804 to rotate, drives one of the driven pulleys II 801 / driven pulley III 803 to rotate through the transmission belt III 806, and under the action of each transmission belt II 807 and the rotating shaft 802, each driven pulley II 801 and each driven pulley III 803 rotate simultaneously, driving the connecting slide rod 703 to slide in the corresponding longitudinal movement chute 609, so that each sliding block 704 moves synchronously with each pushing rod 2, and each pushing rod 2 slides in the corresponding sliding groove 702, and the end away from each sliding block 704 can extend outside or retract into the sliding frame 4;

[0074] During the blank holding action, the linear cylinder 302 acts, pushing the turning frame 301 to circumferentially turn around the corresponding pin shaft, driving the blank holding frame 303 to descend, pressing the material on the external conveyor belt. After the pushing rod 2 pushes the material out of the external conveyor belt, the linear cylinder 302 acts again, making the turning frame 301 circumferentially turn in the opposite direction around the corresponding pin shaft, so that the blank holding frame 303 rises.

[0075] Embodiment 3:

[0076] As Figures 4 to 5As shown, in this embodiment, in addition to including the structural features of the foregoing embodiment, the pusher rod 2 includes a rod body 201 with a rectangular cross-section, and recesses are provided on opposite side walls; a pair of cooling chambers 202 are spaced apart on both sides inside the rod body 201, extend along the length direction of the rod body 201, and penetrate at the same end; a pair of return channels 203 are spaced apart on both sides inside the rod body 201, are respectively located below the corresponding cooling chambers 202, penetrate at one end, and the other end is connected to the non-penetrating end of the corresponding cooling chamber 202; a cooling medium circulation device includes an outer box 204, a radiator 205, a circulation unit 9, and a cooling medium 206, and is used to circulate the cooling medium 206 in the outer box 204, a pair of cooling chambers 202, and the corresponding return channels 203. The cross-section of each sliding groove 702 is adapted to the rod body 201 with recesses.

[0077] Further, the circulation unit 9 includes a circulation pump 901, whose input end is connected to the outer box 204 through a connecting pipe 902, and the output end is connected to each cooling chamber 202 through an output pipe 903; a return pipe 904, which is provided with an electromagnetic flow limiting valve 905 and connects each return channel 203 in the inner cavity of the outer box 204.

[0078] Further, the pusher rod 2 further includes a plurality of notches 207, which are spaced apart on the side wall of the rod body 201 and extend along the length direction of the rod body 201; a plurality of connecting holes 208 connect each notch 207 with the corresponding cooling chamber 202; a plurality of high-density sponges 209 are respectively embedded in each notch 207, and the cooling medium 206 is a lubricating fluid.

[0079] Further, the pusher rod 2 further includes a plurality of annular grooves 210, which are respectively provided in the middle of each connecting hole 208; a plurality of piston plates 211 are respectively slidably installed at the end of each annular groove 210 away from the notch 207; a plurality of springs 212 are respectively provided between each piston plate 211 and the end of the annular groove 210 close to the notch 207; a plurality of notches 213 are spaced apart on the periphery of each piston plate 211. When the piston plate 211 slides towards the corresponding notch 207, the lubricating fluid can enter the notch 207 through the connecting hole 208, the annular groove 210, and the notch 213.

[0080] In this embodiment of the present application, due to the adoption of the above structure, the circulation pump 901 continuously operates, enabling the lubricating fluid to circulate between the outer box 204, the connecting pipe 902, the output pipe 903, each cooling chamber 202, each return channel 203 and the return pipe 904 to cool the rod body 201. When lubrication of the rod body 201 is required, the electromagnetic flow-limiting valve 905 is actuated to reduce the diameter of the channel in the return pipe 904, increasing the pressure of the lubricating fluid in each cooling chamber 202, pushing open the piston plates 211 located in each annular groove 210, compressing the springs 212 and shortening them. Then, part of the lubricating fluid can enter each notch 207 after passing through each connecting hole 208, each notch 213 and each annular groove 210 from each cooling chamber 202, soak into the corresponding high-density sponge 209, and infiltrate the lubricating fluid between the outer side of the rod body 201 and the corresponding sliding groove 702.

[0081] The radiator 205 can be a semiconductor refrigeration chip, with the refrigerating end extending into the inner cavity of the outer box 204 and the heat dissipating end extending outside the outer box 204.

[0082] It should be noted that in this article, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, the features described with reference to certain examples may be combined in other examples.

[0083] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them fall within the protection scope of the present application.

Claims

1. A synchronous reciprocating continuous feeding device for a cartoning machine, comprising a frame, a plurality of pushing rods and a plurality of pressing devices, characterized in that, Further included are: A sliding frame for carrying each of the pushing rods and each of the material pressing devices; A transverse moving carrier frame driven by an actuating device 1 for carrying the sliding frame to slide horizontally on the machine frame; A longitudinal moving carrier frame driven by an actuating device 2 for enabling each of the pushing rods to slide longitudinally on the sliding frame; The longitudinal moving carrier frame includes: A plurality of fixed blocks fixedly installed on the sliding frame, each having a sliding groove; A connecting sliding rod parallel to each sliding rail, with both ends slidably installed on the machine frame through a pair of longitudinal moving sliding grooves; A plurality of sliding blocks respectively fixedly installed at the inner ends of each of the pushing rods and all slidably sleeved on the outer wall of the connecting sliding rod; Wherein, each of the pushing rods is slidably installed in a corresponding sliding groove; The material pressing device includes: A turning frame, the lower end of which is rotatably installed on one side of the sliding frame through a pin shaft; A straight-line cylinder, one end of which is hinged to the upper end of the turning frame and the other end is hinged to the other side opposite to the sliding frame; A material pressing frame fixedly installed on the turning frame and extending away from the sliding frame; The pushing rod includes: A rod body with a rectangular cross-section, and sunken grooves are provided on the opposite side walls; A pair of cooling cavities spaced apart on both sides inside the rod body, extending along the length direction of the rod body, and penetrating at the same end; A pair of return channels spaced apart on both sides inside the rod body, respectively located below the corresponding cooling cavities, penetrating at one end and connected to the non-penetrating end of the corresponding cooling cavity at the other end; A cooling medium circulation device including an outer box, a radiator, a circulation unit and a cooling medium for circulating the cooling medium in the outer box, a pair of cooling cavities and the corresponding return channels; Wherein, the cross-section of each of the sliding grooves is adapted to the rod body with sunken grooves; The circulation unit includes: A circulation pump, the input end of which is connected to the outer box through a connecting pipe, and the output end is connected to each cooling cavity through an output pipe; A return pipe with an electromagnetic flow limiting valve, connecting each return channel in the inner cavity of the outer box; The pushing rod further includes: A plurality of notches spaced apart on the side wall of the rod body, extending along the length direction of the rod body; A plurality of connecting holes connecting each of the notches to the corresponding cooling cavity; A plurality of high-density sponges respectively inlaid in each of the notches; Wherein, the cooling medium is a lubricating liquid; The pushing rod further includes: A plurality of annular grooves respectively provided in the middle of each of the connecting holes; A plurality of piston plates respectively slidably installed at the end of each of the annular grooves away from the notch; A plurality of springs respectively provided between each of the piston plates and the end of the annular groove adjacent to the notch; A plurality of notches spaced apart on the periphery of each of the piston plates, and when the piston plate slides towards the corresponding notch direction, the lubricating liquid enters the notch through the connecting hole, the annular groove and the notch.

2. The synchronous reciprocating continuous feeding device for a cartoning machine according to claim 1, characterized in that, The transverse moving carrier frame includes: A plurality of sliding rails parallel to each other and extending transversely; A plurality of sliders fixedly installed on the sliding frame and slidable on the corresponding sliding rails.

3. A synchronous reciprocating continuous feeding device for a cartoning machine according to claim 2, characterized in that, The actuating device 1 includes: A driven pulley 1 rotatably installed at the bottom of the machine frame and located at one end of the sliding rail; A driving pulley 1 driven by a motor 1 and in transmission connection with the driven pulley 1 through a transmission belt 1; Wherein, one side of the transmission belt 1 is fixedly connected to the sliding frame through a connecting frame.

4. A synchronous reciprocating continuous feeding device for a cartoning machine according to claim 1, characterized in that, The actuating device 2 includes: A pair of driven belt pulleys II are rotatably mounted on the side walls of the frame, respectively located at the same end of each longitudinal movement chute, and are synchronously connected through a rotating shaft; A pair of driven belt pulleys III are rotatably mounted on the side walls of the frame, respectively located at the other end of each longitudinal movement chute, and are drivingly connected to the corresponding driven belt pulley II through a transmission belt II; A driving belt pulley II is driven by a motor II and is drivingly connected to one of the driven belt pulleys II or the driven belt pulley III through a transmission belt III.

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