A tow automatic stacking mechanism

Abstract

A wire bundle automatic stacking mechanism comprises: a fixed frame, which is a rectangular frame structure, straddling a conveyor line; a lifting mechanism, a swing bucket mechanism, and two pressure plate mechanisms, which are respectively arranged in front and behind the swing bucket mechanism; a transition mechanism, which is arranged below the frame on one side of the rectangular frame structure of the fixed frame; a plurality of limit sensors, which are respectively arranged on the upper and lower frames of the gantry frame on one side of the guide rail, the two ends of the slide rail, and the base support plate corresponding to the swing bucket of the swing bucket mechanism; a controller, the lifting drive motor of the lifting mechanism, the cylinders of the two pressure plate mechanisms, the swing bucket motor of the swing bucket mechanism, the wire release motor, the pressure wheel adjustment cylinder, the substrate drive motor of the substrate drive mechanism, the belt drive motor and the limit sensor are all electrically connected to the controller.

Description

Technical Field

[0001] The invention relates to a raw silk packaging technology, in particular to an automatic silk bundle stacking mechanism suitable for stacking and packaging raw silk. Background Art

[0002] When the raw silk is connected to the carbonization production line, the transfer and replacement of the spindles will cause a waste of human resources and processes, and safety accidents are very likely to occur during the transfer and replacement process;

[0003] During the pre-oxidation process, the raw silk is extremely sensitive to heat release and is prone to ignition. Once the pre-oxidation process is interrupted or paused, it is very likely to cause safety hazards;

[0004] The original spiral winding spindle method cannot achieve the pre-oxidation connection between the beginning and the end of the original yarn because the head of the original yarn is rolled inside the spindle;

[0005] Wire stacking and packaging is the inevitable choice for large-tow carbon fiber. It is the first choice for creating all-round intelligent integration of raw fiber production, carbonization, stacking and packaging. Summary of the invention

[0006] The purpose of the present invention is to design an automatic yarn bundle stacking mechanism, eliminate the existing raw silk spindle transfer and replacement process, simplify the raw silk production process, reduce the safety risk of replacing spindles, promote the full automation of raw silk bundle production and packaging, reduce consumption, and enhance productivity; at the same time, it solves the problem of connecting the raw silk spindles end to end, automatically docking the carbonization line, and eliminating the risk of heat release and fire caused by pre-oxidation and carbonization of the raw silk.

[0007] To achieve the above object, the technical solution of the present invention is:

[0008] A tow automatic stacking mechanism, comprising: a fixed frame, which is a rectangular frame structure, straddling a conveyor line body; a lifting mechanism, comprising: a gantry, arranged at the upper end of the fixed frame; two guide rails and upper sliders thereof, the two guide rails are respectively arranged on the front sides of the two side frames of the gantry; two transmission assemblies are respectively arranged on the inner sides of the two side frames of the gantry, the transmission assembly comprises: an upper and a lower transmission wheel, which are respectively arranged on the upper and lower parts of one side of the gantry through a rotating shaft and a bearing seat; a transmission belt, which is connected to the upper and lower transmission wheels; a lifting drive motor and a reducer, which are arranged on a side surface of the center of the upper end of the gantry, the reducer has two output ends, and are respectively connected to the upper transmission wheels in the two transmission assemblies through connecting shafts, so as to drive the upper transmission wheel to rotate The camshaft is connected to the bottom of the bottom plate of the base through a pivot axis and a bearing seat at both ends of the bottom plate. The camshaft is connected to the bottom of the bottom plate through a pivot axis and a bearing seat at both ends of the bottom plate. The camshaft is connected to the bottom of the bottom plate through a pivot axis and a bearing seat at both ends of the bottom plate. The camshaft is connected to the bottom of the bottom plate through a pivot axis and a bearing seat at both ends of the bottom plate. The camshaft is connected to the bottom of the bottom plate through a pivot axis and a bearing seat at both ends of the bottom plate. The camshaft is connected to the bottom of the bottom plate through a pivot axis and a bearing seat at both ends of the bottom plate. The camshaft is connected to the bottom of the bottom plate through a pivot axis and a bearing seat at both ends of the bottom plate. The camshaft is connected to the bottom of the bottom plate through a pivot axis and a bearing seat at both ends of the camshaft ... The guide wheel is arranged at the middle part of the upper end bracket of the gantry through a bracket and a rotating shaft, and is located above the wire bundle guide wheel; the wire bundle guide wheel and the wire bundle auxiliary guide wheel are provided with grooves along the circumferential direction; the wire release motor is arranged on the back side of the bottom plate, and its output shaft is connected to one end of the wire bundle rotating shaft; the wire bundle pressure wheel is installed on the upper part of a support frame through a pressure wheel shaft, and the lower part of the support frame is penetrated through the second mounting hole of the bottom plate through a connecting rotating shaft; the wire bundle pressure wheel matches the groove of the wire bundle guide wheel; the pressure wheel adjusting cylinder, whose cylinder body is arranged on the back side of the bottom plate, and the end of its piston rod is movably connected to a connecting rod, and the other end of the connecting rod is pivotally connected to one end of the pressure wheel shaft passing through the bottom plate; two pressure plate mechanisms are respectively arranged at the front and rear of the swing bucket mechanism, and the pressure plate mechanism includes The invention comprises: two pairs of slide rails and upper sliders, the two slide rails are respectively arranged on the bottom surface of the frame in the length direction of the rectangular frame structure of the fixed frame; a movable base plate, the upper end surface of which is connected to the bottom surface of the sliders on the two pairs of slide rails on both sides; a center hole is arranged in the center of the movable base plate, guide holes are arranged on both sides of the center hole, and guide sleeves are arranged on the upper ends of the guide holes; a cylinder, the cylinder body of which is vertically arranged on the center hole of the movable base plate, and the end of its piston rod extends downward from the center hole; a pressure plate, the center of which is connected to the end of the piston rod of the cylinder, two guide rods are vertically arranged on both sides of the top surface of the pressure plate, and extend from the guide holes and guide sleeves on the movable base plate; a base plate driving mechanism, comprising: a rack, which is arranged on the inner side surface of the frame in the length direction of the rectangular frame structure of the fixed frame, parallel to the slide rails, and a transmission tooth is arranged on the lower end surface of the rack;The substrate driving motor is arranged on the top surface of the movable substrate near the rack, and a driving gear is arranged at the end of its output shaft, and the driving gear is meshed with the rack; the transition mechanism includes: two pulleys, which are pivotally connected to the two ends of the inner side of a fixed rod, and the fixed rod is arranged below the frame of one side of the rectangular frame structure of the fixed frame; the two pulleys are connected by a transmission belt; the belt driving motor is arranged on the outer side of the fixed rod near a pulley through a mounting bracket, and its output shaft is connected to the pulley shaft of the pulley; a guide rail pair is arranged on the upper end surface of the fixed rod along the length direction of the fixed rod ; An installation box, whose bottom surface is connected to the slider of the guide rail pair, and a connection block connected to the transmission belt is provided on the bottom surface of the installation box; a plurality of limit sensors are respectively arranged on the upper and lower frames of the gantry on one side of the guide rail, the two ends of the slide rail, and the base support plate corresponding to the swing bucket of the swing bucket mechanism; a controller, the lifting drive motor of the lifting mechanism, the cylinders of the two pressure plate mechanisms, the swing bucket motor of the swing bucket mechanism, the wire release motor, the pressure wheel adjustment cylinder, the substrate drive motor of the substrate drive mechanism, the belt drive motor and the limit sensors are all electrically connected to the controller. ;

[0009] Preferably, a fixed frame is sleeved on the upper part of the swing bucket, and two sides of the fixed frame are pivotally connected to the lower part of the base bottom plate and the support plate respectively.

[0010] Preferably, a semicircular guide bracket is provided on the support plate of the swing bucket mechanism base, on which at least two limit sensors are provided, and the limit sensors are arranged at an angle; a guide rod cooperating with the limit sensor is provided in the upper center of the swing bucket.

[0011] Preferably, a semicircular guide bracket is provided on the support plate of the swing bucket mechanism base, on which at least two limit sensors are provided, and the limit sensors are arranged at an angle; a fixed frame is sleeved on the upper part of the swing bucket, and the two sides of the fixed frame are respectively pivotally connected to the lower part of the base bottom plate and the support plate, and a guide rod cooperating with the limit sensor is provided in the center of the fixed frame.

[0012] In the automatic tow stacking mechanism of the present invention:

[0013] The conveyor line is mainly used for conveying the box and driving the box to swing left and right during the wire stacking process; the pressure plate mechanism is mainly used to press and compact the wire bundles stacked in the box; the swing bucket mechanism is mainly used to stack the wire bundles neatly in the box; the lifting mechanism is mainly used to lift the swing bucket mechanism, and cooperate with the swing bucket mechanism to stack the wire bundles neatly in the box; the electronic control system motion control, limit sensing and signal feedback, etc., meet the automatic operation of the equipment.

[0014] The advantages of the present invention are:

[0015] The present invention changes the traditional carbon fiber tow docking production process, promotes the upgrade of traditional production assembly lines to intelligent automatic production lines, and achieves a technological breakthrough from traditional intensive manual assembly operations to modern mechanical intelligent coordinated control operations. It improves product production safety, improves working conditions, reduces costs, optimizes production line process intelligent control, reduces safety hazards, enhances productivity, and greatly promotes the extensive development of this technology field, meeting the needs of green digital factories with intelligent power distribution equipment.

[0016] The present invention reduces the danger of replacing raw silk, improves quality and efficiency, meets the requirements of stacking wires with different packing specifications and raw silk widths, promotes the integration of carbon fiber production, effectively breaks through the end-to-end connection of spindles with different rolls of raw silk, automatically connects the carbonization line, and eliminates the risk of heat release and fire caused by pre-oxidation and carbonization of the raw silk. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a stereogram of an embodiment of the present invention.

[0018] Figure 2 It is a front view of an embodiment of the present invention.

[0019] Figure 3 It is a top view of an embodiment of the present invention.

[0020] Figure 4 It is a three-dimensional diagram of the coordination of the lifting mechanism, the swing bucket mechanism, the two pressure plate mechanisms, and the transition mechanism in the embodiment of the present invention.

[0021] Figure 5 It is a three-dimensional diagram of the coordination of the lifting mechanism, the swing bucket mechanism, the two pressure plate mechanisms, and the transition mechanism in the embodiment of the present invention.

[0022] Figure 6 It is a three-dimensional diagram of the coordination of the lifting mechanism, the swing bucket mechanism, the two pressure plate mechanisms, and the transition mechanism in the embodiment of the present invention.

[0023] Figure 7 The three-dimensional structure of the swing bucket mechanism in the embodiment of the present invention is shown in FIG. Figure 1 .

[0024] Figure 8 The three-dimensional structure of the swing bucket mechanism in the embodiment of the present invention is shown in FIG. Figure 2 .

[0025] Fig. 9 It is a three-dimensional diagram of the pressing plate mechanism in an embodiment of the present invention.

[0026] Fig.10 It is a three-dimensional diagram of the transition mechanism in the embodiment of the present invention. DETAILED DESCRIPTION

[0027] See also Figures 1 to 10The automatic tow stacking mechanism of the present invention comprises:

[0028] The fixed frame 1 is a rectangular frame structure and is arranged across a conveyor line 2;

[0029] Lifting mechanism 3, comprising:

[0030] A gantry 31 is arranged on the upper end of the fixing frame 1;

[0031] Two guide rails 32 and upper sliders thereof, the two guide rails 32 are respectively arranged on the front sides of the frames on both sides of the gantry 1;

[0032] The two transmission components 33 and 33' are respectively arranged on the inner sides of the two frames of the gantry 31. The transmission component 33 (taking the transmission component 33 as an example, the same below) includes:

[0033] The upper transmission wheel 331 and the lower transmission wheel 332 are respectively arranged at the upper and lower parts of one side of the gantry 31 through a rotating shaft and a bearing seat;

[0034] A transmission belt 333 connected to the upper and lower transmission wheels 331 and 332;

[0035] The lifting drive motor 334 and the reducer are arranged on a side of the center of the upper end of the gantry 31. The reducer has two output ends, and is respectively connected to the upper transmission wheels 331 in the two transmission components 33 and 33' through connecting shafts, thereby driving the upper transmission wheel 331 to rotate, thereby causing the transmission belt 333 to move up and down;

[0036] The swing bucket mechanism 4 comprises:

[0037] The base 41 is mainly composed of a bottom plate 411 and a support plate 412 arranged parallel to the lower front part of the bottom plate 411; an axial hole is symmetrically arranged at the lower center of the bottom plate 411 and the center of the support plate 412; a first mounting hole is arranged at the upper center of the bottom plate 411 and a second mounting hole on one side thereof; both sides of the back side of the bottom plate 411 are connected to the sliders on the two guide rails 32 and the transmission belts 333 of the two transmission components 33;

[0038] The swing bucket 42 is pivotally connected between the lower part of the base bottom plate 411 and the support plate 412 through the swing bucket rotating shaft and the bearing seats at both ends;

[0039] The swing bucket motor 43 is arranged on the back of the bottom plate 411, and its output shaft is connected to one end of the swing bucket shaft located on the bottom plate 411;

[0040] The tow guide wheel 44 is arranged at the first mounting hole of the bottom plate 411 through the tow shaft and is located on one side above the upper port of the swing bucket 42;

[0041] The tow auxiliary guide wheel 45 is arranged in the middle of the upper bracket of the gantry 31 through a bracket 451 and a rotating shaft 452, and is located above the tow guide wheel 44; the tow guide wheel and the tow auxiliary guide wheel are provided with grooves along the circumferential direction;

[0042] A wire unwinding motor 46 is disposed on the back of the bottom plate 411, and its output shaft is connected to one end of the wire bundle rotating shaft;

[0043] The tow pressing wheel 47 is mounted on the upper part of a support frame 472 through a pressing wheel shaft 471, and the lower part of the support frame 472 is penetrated through the second mounting hole of the bottom plate 411 through a connecting shaft 473; the tow pressing wheel matches the groove of the tow guide wheel;

[0044] The pressure wheel regulating cylinder 48 has a cylinder body disposed on the back of the bottom plate 411, and the end of the piston rod thereof is movably connected to a connecting rod 481, and the other end of the connecting rod 481 is pivotally connected to an end of the pressure wheel shaft 471 passing through the bottom plate 411;

[0045] The two pressing plate mechanisms 5 and 5' are respectively arranged at the front and rear of the swing bucket mechanism 4. The pressing plate mechanism 5 (taking the pressing plate mechanism 5 as an example, the same below) includes:

[0046] Two pairs of slide rails 51, 51' and upper slide blocks thereof, the two slide rails 51, 51' are respectively arranged on the bottom surface of the frame in the length direction of the rectangular frame structure of the fixing frame 1;

[0047] The movable substrate 52 has two sides of its upper end surface connected to the bottom surfaces of the sliders on the two pairs of slide rails 51; a center hole is provided in the center of the movable substrate 52, guide holes are provided on both sides of the center hole, and guide sleeves 53 are provided at the upper ends of the guide holes;

[0048] The cylinder 54 has a cylinder body vertically disposed on the center hole of the movable base plate 52, and an end of a piston rod thereof extends downward from the center hole;

[0049] A pressure plate 55, the center of which is connected to the end of the piston rod of the cylinder 54, and two guide rods 56 are vertically arranged on both sides of the top surface of the pressure plate 55, and extend from the guide holes and guide sleeves 53 on the movable base plate 52;

[0050] The substrate driving mechanism 57 comprises:

[0051] The rack 571 is arranged on the inner side of the frame in the length direction of the rectangular frame structure of the fixing frame 1, parallel to the slide rail 51, and has a transmission tooth on its lower end surface;

[0052] The substrate driving motor 572 is arranged on the top surface of the movable substrate 52 near the rack, and a driving gear 573 is arranged at the end of the output shaft thereof, and the driving gear 573 is meshed with the rack 571;

[0053] Transitional institutions6, including:

[0054] The two pulleys 61, 62 are pivotally connected to the two ends of the inner side of a fixing rod 63, and the fixing rod 63 is arranged below the frame of one side of the rectangular frame structure of the fixing frame 1; the two pulleys 61, 62 are connected by a transmission belt 64;

[0055] The belt drive motor 65 is arranged on the outer side of the fixing rod 63 near a pulley 6 through a mounting bracket, and its output shaft is connected to the axle of the pulley 6;

[0056] A guide rail pair 66 is provided on the upper end surface of the fixing rod 63 along the length direction of the fixing rod 63;

[0057] A mounting box 67, the bottom of which is connected to the slider of the guide rail pair 66, and a connecting block 671 connected to the transmission belt 64 is provided on the bottom of the mounting box 67;

[0058] A plurality of limit sensors 10, 10', 10", are respectively arranged on the upper and lower frames of the gantry 31 on one side of the guide rail 32, the two ends of the slide rail 51, the base support plate 412 of the swing bucket mechanism 4 corresponding to the swing bucket 42, and the outer surface of the fixing rod 63 of the corresponding transition mechanism installation box 67;

[0059] A controller (not shown in the figure), the lifting drive motor of the lifting mechanism, the cylinders of the two pressure plate mechanisms, the swing bucket motor of the swing bucket mechanism, the wire release motor, the pressure wheel adjustment cylinder, the substrate drive motor of the substrate drive mechanism, the belt drive motor and the limit sensor are all electrically connected to the controller.

[0060] Preferably, a fixing frame 421 is sleeved on the upper portion of the swing bucket 42 , and two sides of the fixing frame 421 are pivotally connected to the lower portion of the base bottom plate 411 and the support plate 412 , respectively.

[0061] Preferably, a semicircular guide bracket 413 is provided on the base support plate 412 of the swing bucket mechanism 4, on which two limit sensors 10" are provided, and the limit sensors are arranged at an angle; a guide rod 414 cooperating with the limit sensor is provided in the upper center of the swing bucket 42.

[0062] Preferably, a semicircular guide bracket is provided on the support plate of the swing bucket mechanism base, on which at least two limit sensors are provided, and the limit sensors are arranged at an angle; a fixed frame is sleeved on the upper part of the swing bucket, and the two sides of the fixed frame are respectively pivotally connected to the lower part of the base bottom plate and the support plate, and a guide rod cooperating with the limit sensor is provided in the center of the fixed frame.

[0063] Working process of the present invention:

[0064] 1. The box 100 is transported to the wire stacking position by the conveyor line;

[0065] 2. The tow is transported from the production line and flows into the swing bucket mechanism through the tow guide wheel on the lifting mechanism;

[0066] 3. The swing bucket starts to swing left and right, and the conveyor line drives the box to move forward and backward. At the same time, the lifting mechanism lifts the swing bucket mechanism to make height compensation, so that the tow is folded in the box at a uniform speed;

[0067] 4. Each time the tow is folded, the pressing plate assembly presses once to ensure that the tow is pressed tightly and the box is filled with the required weight;

[0068] 5. When the box is full, the swing bucket swings into the transition mechanism, and the conveyor line sends the full box out and the empty box in. The swing bucket swings into the empty box again to stack the wires, and the transition mechanism runs synchronously with the box.

Claims

1. A tow automatic stacking mechanism, characterized in that: include: The fixed frame is a rectangular frame structure and is arranged across the top of a conveyor line; Lifting mechanism, including: A gantry frame is arranged on the upper end of the fixed frame; Two guide rails and an upper slider thereof, wherein the two guide rails are respectively arranged on the front sides of the frames on both sides of the gantry; Two transmission components are respectively arranged on the inner sides of the two frames of the gantry, and the transmission components include: The upper and lower transmission wheels are respectively arranged at the upper and lower parts of one side of the gantry through a rotating shaft and a bearing seat; A transmission belt connected to the upper and lower transmission wheels; The lifting drive motor and the reducer are arranged on a side of the center of the upper end of the gantry. The reducer is provided with two output ends, and is respectively connected to the upper transmission wheels in the two transmission components through connecting shafts, thereby driving the upper transmission wheels to rotate, thereby causing the transmission belt to move up and down; The swing bucket mechanism comprises: The base is mainly composed of a bottom plate and a support plate arranged parallel to the lower part of the front side of the bottom plate; an axial hole is symmetrically arranged at the lower center of the bottom plate and the center of the support plate; a first mounting hole and a second mounting hole located on one side of the first mounting hole are arranged at the upper center of the bottom plate; two sides of the back side of the bottom plate are connected to the sliders on the two guide rails and the transmission belts of the two transmission components; A swing bucket is pivotally connected between the bottom plate of the base and the support plate through a swing bucket rotating shaft and bearing seats at both ends thereof; A swing bucket motor is arranged on the back of the bottom plate, and its output shaft is connected to one end of the swing bucket shaft located on the bottom plate; A tow guide wheel is arranged at the first mounting hole of the bottom plate through the tow rotating shaft and is located on one side above the upper port of the swing bucket; The tow auxiliary guide wheel is arranged in the middle of the upper bracket of the gantry through a bracket and a rotating shaft, and is located above the tow guide wheel; the tow guide wheel and the tow auxiliary guide wheel are provided with grooves along the circumferential direction; the wire release motor is arranged on the back of the bottom plate, and its output shaft is connected to one end of the tow rotating shaft; A tow pressure wheel is mounted on an upper portion of a support frame through a pressure wheel shaft, and a lower portion of the support frame is penetrated through a second mounting hole of the bottom plate through a connecting shaft; the tow pressure wheel matches the groove of the tow guide wheel; A pressure wheel adjusting cylinder, whose cylinder body is arranged on the back of the bottom plate, whose piston rod end is movably connected to a connecting rod, and the other end of the connecting rod is pivotally connected to one end of the pressure wheel shaft passing through the bottom plate; Two pressing plate mechanisms are respectively arranged at the front and rear of the swing bucket mechanism, and the pressing plate mechanism comprises: Two pairs of slide rails and an upper slide block thereof, wherein the two slide rails are respectively arranged on the bottom surface of the frame in the length direction of the rectangular frame structure; A movable base plate, the upper end surface of which is connected to the bottom surfaces of the sliders on the two pairs of slide rails on both sides; a center hole is provided in the center of the movable base plate, guide holes are provided on both sides of the center hole, and guide sleeves are provided at the upper ends of the guide holes; A cylinder, the cylinder body of which is vertically arranged on the central hole of the movable base plate, and the end of the piston rod of which extends downward from the central hole; A pressure plate, the center of which is connected to the end of the piston rod of the cylinder, and two guide rods are vertically arranged on both sides of the top surface of the pressure plate and extend from the guide holes and guide sleeves on the movable base plate; The substrate driving mechanism comprises: A rack is arranged on the inner side of the frame in the length direction of the rectangular frame structure, parallel to the slide rail, and has a transmission tooth on its lower end surface; The substrate driving motor is arranged on the top surface of the movable substrate near the rack, and a driving gear is arranged at the end of the output shaft thereof, and the driving gear is meshed with the rack; Transition agencies, including: Two pulleys are pivotally connected to the two ends of the inner side of a fixed rod, and the fixed rod is arranged below the frame of one side of the rectangular frame structure; the two pulleys are connected by a transmission belt; A belt-driven motor is arranged on the outer side of the fixing rod near a pulley through a mounting bracket, and its output shaft is connected to the pulley shaft; A guide rail pair is arranged on the upper end surface of the fixing rod along the length direction of the fixing rod; An installation box, the bottom of which is connected to the slider of the guide rail pair, and the bottom of the installation box is provided with a A connecting block connected to the transmission belt; A plurality of limit sensors are respectively arranged on the upper and lower frames of the gantry on one side of the guide rail, on both ends of the slide rail and on the support plate of the swing bucket mechanism corresponding to the swing bucket; The controller, the lifting drive motor of the lifting mechanism, the cylinders of the two pressure plate mechanisms, the swing bucket motor of the swing bucket mechanism, the wire release motor, the pressure wheel adjustment cylinder, the substrate drive motor of the substrate drive mechanism, the belt drive motor and the limit sensor are all electrically connected to the controller.

2. The automatic tow stacking mechanism according to claim 1, characterized in that: A fixing frame is sleeved on the upper part of the swing bucket, and two sides of the fixing frame are respectively pivotally connected to the lower part of the bottom plate of the base and the supporting plate.

3. The automatic tow stacking mechanism according to claim 1 or 2, characterized in that: A semicircular arc guide bracket is arranged on the support plate of the swing bucket mechanism base, on which at least two limit sensors are arranged at an angle; a guide rod cooperating with the limit sensor is arranged at the center of the upper part of the swing bucket.

4. The automatic tow stacking mechanism according to claim 1, characterized in that: A semicircular guide bracket is provided on the support plate of the base of the swing bucket mechanism, on which at least two limit sensors are provided, and the limit sensors are arranged at an angle; a fixed frame is sleeved on the upper part of the swing bucket, and the two sides of the fixed frame are respectively pivotally connected to the lower part of the bottom plate of the base and the support plate, and a guide rod cooperating with the limit sensor is provided in the center of the fixed frame.

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