JP4218023B2 - Friction drive transfer device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a friction drive transport device that propels a transport traveling body supported so as to be able to travel along a transport path with friction drive wheels on the side of the transport path.
[0002]
[Prior art]
In this type of friction drive transport device, a load bar is provided along a travel direction on a transport traveling body supported so as to be able to travel along a transport path, and a friction surface of the load bar is abutted on the transport path side. A drive unit having a friction drive wheel that rotates is provided, and is well known in the art as disclosed in Patent Document 1, for example.
[0003]
[Patent Document 1]
JP 2003-54731 A
[0004]
Thus, as shown in Patent Document 1, the end portion of the load bar of this type of friction drive conveyance device has an arc shape, a V shape or the like in order to smoothly enter the friction drive wheel. Accordingly, the total length of the linear friction surface parallel to the traveling direction with which the friction drive wheels abut is shorter than the total length of the load bar. For this reason, as shown in Patent Document 1, when the distance between the front and rear friction drive wheels is set equal to the total length of the load bar, the total length of the friction surface of the load bar is greater than the distance between the front and rear friction drive wheels. It becomes shorter, and neither of the front and rear two friction drive wheels comes into contact with the friction surface of the load bar, that is, both of the front and rear friction drive wheels come into contact with the tapered surface at both ends. there is a possibility. In this state, when the load bar (conveyance traveling body) is pushed forward by the rotational drive of the friction drive wheel on the lower side in the conveyance direction, the front load bar (constricted surface at the end) and the friction drive are driven. There is a risk that slip may occur between the wheel and the traveling body for conveyance cannot be reliably driven forward.
[0005]
[Problems to be solved by the invention]
The friction drive conveyance device described in Patent Document 1 is provided with a timer function to solve the above problems, and delays the stop timing of the friction drive wheel on the upper side in the conveyance direction away from the load bar by a certain time. However, with this alone, it is guaranteed that the load bar (conveying traveling body) can be propelled forward as reliably and strongly as when the friction drive wheel in contact with the friction surface of the load bar is rotationally driven. Can not be obtained, and the cost increase by adding this timer mechanism is inevitable. Of course, it is conceivable that the distance between the friction drive wheels from the beginning is shorter than the total length of the friction surface of the load bar, but two or more friction drive wheels always come into contact with one load bar, The drive control of each friction drive wheel becomes complicated, leading to a significant cost increase with the increase in the number of friction drive wheels and their drive motors, and the practicality is reduced.
[0006]
[Means for Solving the Problems]
  An object of the present invention is to provide a friction drive transport apparatus that can solve the above-described conventional problems, and the means thereof is shown with reference numerals of embodiments to be described later.The drive unit 23 is disposed in at least a specific section in the transport path, and the drive unit 23 isFriction drive wheel 30 that rotates in contact with the friction surface 15 of the transport traveling body 1.WhenThe brakeless motor 29 that drives the friction drive wheel 30And the relevantA sensor 32 that detects whether the friction drive wheel 30 is in contact with the friction surface 15 of the transporting traveling body 1 or is in a free state in which it is not in contact.AndPrepared,This drive unit 23 is in the specific section,The friction drive wheels 30 of the drive units 23 are arranged at equal intervals not longer than the entire length of the friction surface 15 of the transport traveling body 1.Arranged inIn the friction drive transport apparatus, the control means 24 for controlling the brakeless motor 29 provided in each drive unit 23 is connected to each drive unit 23, and each of the control means 24 is one lower side. When the sensor 32 included in the drive unit 23 detects a friction drive wheel idle state, the drive unit 23 is connected to each other by a cable 47 that transmits an activation signal to the control means 24 connected to the drive unit 23 on the upper side. When the sensor 32 of the connected drive unit 23 detects the friction drive wheel contact state and receives a start signal from the one lower control means 24 via the cable 47, the control means 24 The drive of the friction drive wheel 30 of the connected drive unit 23 is started, and the sensor 32 of the connected drive unit 23 is The friction drive wheel 30 upon detection of a friction drive wheel idle and is configured to stop driving.
[0007]
When the present invention having the above-described configuration is implemented, the friction drive wheels 30 can be arranged so as to be arranged at equal intervals substantially equal to the entire length L of the friction surface 15 of the transport traveling body 1. 1, when the load bar 3 that constitutes the friction surface 15 on the side surface is provided, the protrusions 13 and 14 that extend in a cantilever manner are protruded from the front and rear ends of the load bar 3 while changing the vertical height. When the two front and rear transport traveling bodies 1 are closest, the load bar rear end protruding portion 14 of the front transport traveling body 1 and the load bar front end protruding portion 13 of the rear transport traveling body 1 are vertically moved. The load bars 3 are configured to face each other in a state where they overlap each other, and the friction surface 15 of each load bar 3 is in a state where the load bars 3 of the two traveling traveling bodies 1 are in front of each other. The ends of the friction surfaces 15 of the load bars 3 are related to the front-rear direction. It is formed so as to enter into the protrusions 13 and 14 at both ends of the load bar so as to overlap by a certain length d, and the distance D between the friction drive wheels 30 is determined from the total length L of the friction surface 15 of the load bar 3. It is desirable to set the distance short by the predetermined length d.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In FIGS. 1 to 3, reference numeral 1 is a floor traveling carriage type transport traveling body, and 2 is a support guide for the transport traveling body 1. Guide rail. The transporting traveling body 1 includes a load bar 3 parallel to the traveling direction, a support base portion 4 of a transported object W provided on the load bar 3, and four trolleys 5a to 5d that support and guide the load bar 3. I have.
[0010]
The load bar 3 connects the center load bar 6 that connects the two front and rear load trolleys 5a and 5b that support the front and rear ends of the support base 4 of the object W to be conveyed, the front end guide trolley 5c, and the front load trolley 5a. It is composed of a front load bar 7 and a rear load bar 8 connecting the rear end guide trolley 5d and the rear load trolley 5b. In order to enable traveling on a horizontal curve path portion or a vertical curve path portion, Horizontal bending joints 9a and 9b interposed between the load bars 6 and 7 and 6 and 8, vertical bending joints 10a and 10b interposed near both ends of the central load bar 6, and the front load bar 7 Vertical bending joint portion 11a and horizontal bending joint portion 11b interposed near both ends of the rear load bar 8, and vertical bending joint portion 12a and horizontal folding portion interposed near both ends of the rear load bar 8. And a joint portion 12b.
[0011]
As shown in FIG. 2, the front end of the load bar 3 having the above-described configuration, that is, the free end of the front load bar 7, has a front protrusion 13 that cantilevered forward from a lower region in the height direction. The rear end of the load bar 3, that is, the free end of the rear load bar 8, is provided with a rear protrusion 14 that cantilevered backward from the upper region in the height direction. When the two transport traveling bodies 1 are closest to each other, the front protrusion 13 of the load bar 3 of the rear transport traveling body 1 protrudes from the rear of the load bar 3 of the front transport traveling body 1 as shown in the figure. The load bars 3 are configured to face each other in a state where they enter the lower side of the portion 14 and overlap each other.
[0012]
The front and rear end protrusions 13 and 14 of the load bar 3 are configured to have a tapered shape in a plan view (although the illustrated example is substantially V-shaped but may be an arc shape or a bow shape). The left and right side surfaces of the load bar 3 excluding the tapered tip portions 13a and 14a of the projecting portions 13 and 14 constitute a linear friction surface 15 parallel to the traveling direction in plan view in the linear path portion. . Thus, as shown in FIG. 2, the length L of the friction surface 15 of the load bar 3 is set so that the two front and rear transporting traveling bodies 1 are closest to each other and the load bars 3 are pushed toward each other. When in the fitted state, the ends of the friction surfaces 15 of the front and rear load bars 3 are set to overlap each other in the range of the length d in the front-rear direction.
[0013]
The load trolleys 5a and 5b are provided separately from the load bar 3, and include a pair of left and right support front and rear horizontal shaft wheels 16 and a pair of front and rear stabilization vertical shaft rollers 17. The front and rear guide trolleys 5c and 5d are arranged at the front and rear ends of the load bar 3 (the portion from the horizontal bending joint 11b of the front load bar 7 to the free end, and the rear load bar 8 in the horizontal direction). A pair of left and right supporting horizontal shaft wheels 18 and a pair of front and rear steady-state vertical shaft rollers 19 are pivotally supported on a portion from the curved joint portion 12b to the free end.
[0014]
As shown in FIGS. 1 and 3, the guide rail 2 supports and guides a pair of left and right supporting horizontal shaft wheels 16 and 18 of the trolleys 5 a to 5 d, and a steady-state vertical shaft roller of each of the trolleys 5 a to 5 d. A pair of left and right opposed grooved rails 17 and 19 are integrated by yokes 20 arranged at appropriate intervals, and each yoke 20 is mounted on the floor surface via a pair of left and right height adjusting bolts 21. Supports a predetermined height. A cable rack 22 is installed under the guide rail 2 over the entire length of the guide rail 2 so as to be supported by the yoke 20. Thus, a drive unit 23 is disposed in the travel path of the transport traveling body 1 via the yoke 20, and a control means (control box) 24 is adjacent to each drive unit 23 for each drive unit 23. It is attached to the side surface of the guide rail 2 so that it may do.
[0015]
As shown in FIGS. 4 to 6, the drive unit 23 is supported by a support member 25 attached to the yoke 20, is supported on the support member 25 so as to be horizontally swingable around a vertical support shaft 26, and is a swing limit regulating bolt. 27, a swing member 28 whose swing range is restricted, a brakeless motor 29 with a speed reducer (for example, a cyclo reducer) attached to the swing member 28 so that an output shaft 29a is vertically upward, and its output shaft Swing between the swing member 27 and the support member 25 so as to bias the friction drive wheel 30 toward the moving path side of the load bar 3 via the friction drive wheel 30 attached to 29a and the swing member 28. The compression coil spring 31 is loosely fitted to the movement limit regulating bolt 27.
[0016]
Therefore, when the load bar 3 of the transport traveling body 1 enters the position of the drive unit 23, the friction drive wheel 30 is attached to the spring 31 by the tapered tip portion 13a on the front end side of the load bar 3. The friction drive wheel 30 is pushed outward against the force, and the friction drive wheel 30 is pressed against the friction surface 15 of the load bar 3 by the biasing force of the spring 31. The load bar sensor 32 for detecting this state is composed of a limit switch 33a attached to the support member 25 and a limit switch operation piece 33b attached to the swing member 28.
[0017]
As is apparent from the configuration of the load bar 3, the transport traveling body 1 can travel on the horizontal curve path portion and the vertical curve path portion. When the transport traveling body 1 travels along the horizontal curve path portion, the load bar 3 is bent horizontally at each of the horizontal bending joint portions 9a, 9b, 11b, and 12b interposed in the middle thereof. The friction drive wheel 30 of the drive unit 23 disposed in the curve path portion can swing in a large range in the left and right lateral directions with respect to the movement path of the load bar 3 and also on the friction surface 15 of the load bar 3. On the other hand, it must be possible to ensure a substantially constant pressure contact force. An example of the drive unit 23 arranged in such a horizontal curve path will be described with reference to FIGS.
[0018]
In the drive unit 23, the support member 25 is fixed to a movable arm 36 that is supported by a mounting member 34 attached to the yoke 20 so as to be horizontally swingable around a vertical support shaft 35, and the movable arm 36. A U-shaped arm 37 standing on the opposite side of the guide rail 2 through the lower side of the guide rail 2 is connected to the free end of the U-shaped arm 37 and extends to the moving path side of the load bar 3. At the free end of the bearing member 38, a backup roller 39 sandwiching the load bar 3 with the friction drive wheel 30 is pivotally supported. In order to bias the backup roller 39 in a direction away from the moving path of the load bar 3, a torsion coil is interposed between the support member 25 and the mounting member 34 while being loosely fitted to the vertical support shaft 35. A spring 40 is interposed. Reference numeral 41 denotes a stopper bolt attached to the movable arm 36. The end of the stopper bolt 41 abuts against the side surface of the guide rail 2 so that the backup roller 39 is positioned adjacent to the moving path of the load bar 3. To do.
[0019]
The drive unit 23 having this configuration is disposed such that the friction drive wheel 30 is positioned on the curve center side with respect to the guide rail 2 in the horizontal curve path portion. Thus, when the load bar 3 of the transport traveling body 1 enters between the friction drive wheel 30 of the drive unit 23 and the backup roller 39, the friction drive wheel 30 is attached to the spring 31 as described above. The load bar 3 is pressed against the friction surface 15 of the load bar 3 by the force, but the load bar 3 at the position where the friction drive wheel 30 abuts as the conveyance traveling body 1 travels is bent in the horizontal direction by the bending of the horizontal direction. When protruding toward the center of the curve, the entire friction drive wheel 30, swing member 28, support member 25, movable arm 36, U-shaped arm 37, bearing member 38, and backup roller 39 are twisted and the coil spring 40 is twisted. The stopper bolt 41 swings around the vertical support shaft 35 in a direction away from the guide rail 2 against the urging force. At this time, even if the urging force of the torsion coil spring 40 is sufficiently small, the backup roller 39 abuts against the friction surface 15 of the load bar 3 on the opposite side of the friction drive wheel 30, thereby causing friction with the urging force of the spring 31. The drive wheel 30 can be brought into contact with the friction surface 15 of the load bar 3 with an intended pressure contact force.
[0020]
The drive unit 23 is attached to the installation yoke 20 of the guide rail 2 as described above. In this case, as shown in FIG. 10, the interval D between the friction drive wheels 30 arranged at equal intervals is the traveling distance for conveyance. It is set so as not to be longer than the total length L of the friction surface 15 of the load bar 3 of the body 1 (equal to or shorter than the total length L of the friction surface 15 of the load bar 3). Specifically, as shown in FIG. 2, the end of the friction surface 15 of the front and rear load bars 3 when the two front and rear transport traveling bodies 1 are closest to each other and the load bars 3 face each other. The distance D of the friction drive wheels 30 is set to a distance (Ld) that is shorter than the total length L of the friction surface 15 of the load bar 3 by an overlapping length d in which the portions overlap each other in the front-rear direction. In other words, the position of the yoke 20 is determined so that the drive units 23 can be arranged at equal intervals at such an interval (D = L−d). Of course, the yoke 20 itself can be arranged at a sufficiently shorter interval than the interval D.
[0021]
As shown in FIG. 9, the guide rail 2 is divided into lengths substantially equal to the distance D of the drive unit 23 to form guide rail units 42, and each guide rail unit 42 is divided into yokes 20 at both ends of the guide rail 2. By connecting with each other, a transport path of the transport traveling body 1 can be configured. In this case, one drive unit 23 and one control means 24 (control BOX) are attached to each guide rail unit 42, but the guide rail unit 42 is connected to the cable rail 22 of the guide rail unit 42. A power cable 43 having a length substantially equal to the length of 42 is provided in advance. A male connector 43a is attached to one end of the power cable 43, a female connector 43b is attached to the other end, and a power supply connector 43c is interposed in the middle. Accordingly, the guide rail units 42 are connected to each other by the yokes 20 at both ends of the guide rail 2 to form the transport path of the transport traveling body 1, and at the same time, the power cable 43 provided in each guide rail unit 42 is connected to the connectors 43a at both ends. , 43b, the laying of the power cable 43 continuous along the transport path is completed.
[0022]
Thus, the drive unit 23 is attached to the predetermined yoke 20 in the guide rail unit 42, and the control means (control box) 24 is attached to the side surface of the guide rail 2 so as to be adjacent to the drive unit 23. The control means 24 includes a power supply cable 44 connected to the power supply connector 43c of the power cable 43 via the connector 44a, a power supply cable 45 connected to the motor 29 of the drive unit 23, and a drive unit. The load bar sensor ON / OFF signal taking-in cable 46 connected to the load bar sensor 32 (limit switch 33a) 23, the start signal transmission to the control means 24 on the one upper side, and the DC power supply for the control circuit A control cable 47 is detachably connected to each other via a connector, and a connector 48 for connecting the control cable 47 from the control means 24 on the lower side is provided.
[0023]
Therefore, when the guide rail units 42 are connected to each other and the power cable 43 provided in each guide rail unit 42 is connected to the connector, and the drive unit 23 and the control means 24 are attached to the required locations, FIG. 9 and FIG. As shown in FIG. 4, each control means 24 and the power cable 43 are connected by a power supply cable 44, and the motor 29 of each drive unit 23 and each control means 24 are connected by a power feeding cable 45, whereby each drive The motors 29 of the unit 23 are connected in parallel to the power cable 43 via the control means 24, respectively. Further, the load bar sensor 32 (limit switch 33a) of the drive unit 23 and the control means 23 are connected by a cable 46, and adjacent control means 23 are connected by a control cable 47. The cables 44 to 47 are housed and supported in the cable rack 22 and are fixed as necessary.
[0024]
The control means 24 provided for each drive unit 23 only turns on the motor 29 of one drive unit 23 connected to the power supply cable 45 to the ON / OFF state of the load bar sensor 32 in the same drive unit 23. The ON / OFF control is performed based on the ON / OFF state of the load bar sensor 32 in the drive unit 23 adjacent to the lower side, and the configuration of the control circuit will be described based on the flowchart of FIG.
[0025]
Each control means 24 turns ON the activation signal to the control means 24 on the one upper side connected by the cable 47 only when the load bar sensor 32 (limit switch 33a) connected by the cable 46 is OFF. (The activation signal is transmitted to the control means 24 on the upper side via the cable 47). Thus, each control means 24 is operated when the load bar sensor 32 connected by the cable 46 is ON (S1), that is, when the friction drive wheel 30 is in pressure contact with the friction surface 15 of the load bar 3. When the activation signal to the control means 24 on the one upper side connected by the cable 47 is turned off (S2) and the load bar sensor 32 is turned off (S1), that is, the load bar 3 is connected from the friction drive wheel 30. When away, the power supply to the motor 29 connected by the power supply cable 45 is turned off (S5), and the activation signal to the control means 24 on the one upper side connected by the cable 47 is turned on (S6). ) When the load bar sensor 32 connected by the cable 46 is ON (S1) and the start signal from the control means 24 on the lower side is ON (S3), the motor 29 connected by the power supply cable 45 is used. The power supply to is turned on (S4).
[0026]
As is clear from the above control, each drive unit 23 is only relevant when there is an approaching load bar 3 (conveying traveling body 1) and only when one lower drive unit 23 is vacant. While the load bar 3 (conveying traveling body 1) is sent out to the lower side by the friction drive wheel 30, the friction of the drive unit 23 on the upper side is extended until the load bar 3 moves away from the friction drive wheel 30 to the lower side. The drive wheel 30 is maintained in a stopped state. Accordingly, in the load bar 3 to be sent out, the protrusion 13 on the front side always enters the friction drive wheel 30 in the stopped state on the lower side. Here, as described above, each friction drive Since the distance D between the wheels 30 is shorter than the total length L of the friction surface 15 of the load bar 3 by the length d described in paragraph 0012, the load bar 3 fed from the upper side contacts the rear end of the friction surface 15. With the thrust applied from the friction drive wheel 30 being rotationally driven, the lower friction drive wheel 30 in the stopped state is forcibly pushed open by the tapered tip end portion 13 a, and the friction drive wheel 30 is brought into contact with the friction surface 15. The state is surely switched to the pressure contact state (the load bar sensor 32 is turned on).
[0027]
When the friction drive wheels 30 come into contact with the front and rear ends of the friction surface 15 of the load bar 3 in this way, the control means 24 of the lower friction drive wheel 30 transmits to the control means 24 of the upper friction drive wheel 30. The start signal that has been turned off is turned off, and the friction drive wheel 30 on the upper side that has sent out the load bar 3 stops. At this time, since the motor 29 that drives each friction drive wheel 30 is a brakeless motor, the load bar 3 moves to a lower level due to inertia. As the amount of movement due to the inertia, the length d described in paragraph 0012 is set to about 50 mm, preferably about 20 mm, since the actual length of the load bar 3 is about 200 mm to 600 mm in an actual machine having a scale of about 3500 mm. Accordingly, it is possible to avoid the fact that the friction drive wheels 30 of the two front and rear drive means 23 are simultaneously pressed against the front and rear end portions of the friction surface 15 of one load bar 3, and the friction surface of the load bar 3 can be avoided. No. 15 is moved away from the friction drive wheel 30 that has been subjected to the friction drive action until now and stopped.
[0028]
As described above, the load bar 3 (conveying traveling body 1), which has been sent to the position of the one lower friction drive wheel 30 and stopped, is further freed by one lower friction drive wheel 30. When the friction drive wheel 30 is pressed in the vicinity of the front end portion of the friction surface 15 of the load bar 3, it is sent to the lower side. Hereinafter, by repeatedly receiving this action, each load bar 3 (conveying traveling body 1) is sequentially propelled to the lower side without colliding with the preceding load bar 3 (conveying traveling body 1). Of course, when there is a space longer than the distance D between the friction drive wheels 30 between the two front and rear load bars 3 (conveying traveling body 1), the preceding load bar 3 (conveying traveling body 1) does not stop. As long as all the load bars 3 (conveying traveling bodies 1) are continuously driven at a substantially constant speed. Further, when there is a load bar 3 (conveying traveling body 1) that is stopped, it is assumed that there is no large variation in the amount of movement due to the inertia of each conveying traveling body 1 as is apparent from the above-described operation. As shown in FIG. 2, the load bars 3 are sequentially stopped in a state where they face each other, and are stored in a state where the transporting traveling bodies 1 are connected in the front-rear direction.
[0029]
As described above, when the transport traveling bodies 1 are stored in a state where the load bars 3 face each other, the friction surfaces 15 of the load bars 3 overlap with each other with an overlap length d in the front-rear end portions in the front-rear direction. Therefore, the effective length of the friction surface 15 for each load bar 3 (conveying traveling body 1) is Ld, which is equal to the interval D of the friction drive wheels 30. In other words, only the friction drive wheel 30 of one drive unit 23 is pressed against the stored load bar 3 of each transporting traveling body 1, and the length of the friction surface 15 of the load bar 3 is increased. Even though the length L is longer than the distance D of the friction drive wheels 30 by the overlap length d, the plurality of friction drive wheels 30 do not abut against the friction surface 15 of one load bar 3. Of course, there is a possibility that the friction drive wheels 30 may come into contact with the portions where the friction surfaces 15 of the load bars 3 overlap with each other in the front-rear direction, but in this case, friction is always caused at the front end of the friction surface 15 of the leading load bar 3. Since the driving wheels 30 are in contact with each other, only the friction driving wheels 30 are driven to rotate and the leading load bar 3 is pulled forward, so that the friction surfaces 15 are slightly overlapped in the front-rear direction. The leading load bar 3 can be reliably propelled without being substantially affected by the presence of the friction drive wheels 30 in contact with each other in the stopped state (the reverse torque is relatively small because of the brakeless motor 29).
[0030]
The transport traveling body 1 does not need to be frictionally driven by the friction drive wheel 30 of the drive unit 23 in the entire transport path, and is disposed as described above only in a specific section in the transport path. It is also possible to drive the transport traveling body 1 with the drive unit 23 and drive the transport traveling body 1 with another driving means in other sections. Further, even in the section where the drive unit 23 is disposed as described above, the distance D between the friction drive wheels 30 does not have to be constant (equal intervals) in the entire section. For example, when the path length of the section or the total length of the transport path is not an integral multiple of the interval D, or when the pitch of the yoke 20 to which the drive unit 23 is attached is narrow (for example, a horizontal curve path section), the drive unit 23 In some cases, the distance D between the friction drive wheels 30 adjacent to each other in the front and rear is inevitably narrower than other portions. For this reason, at a location where the distance D between the friction drive wheels 30 adjacent to each other in the front and rear is much narrower than the total length L of the friction surface 15 of the load bar 3, Although the two friction drive wheels 30 come into contact with each other, even in such a situation, only the lower friction drive wheel 30 is driven to pull out the load bar 3 and come into contact with the drawn out load bar 3. The friction drive wheel 30 in the stopped state on the upper side is rotated by the load bar 3 (the reverse torque is small because it is the brakeless motor 29), thereby propelling the load bar 3 (conveying traveling body 1) without any trouble. be able to.
[0031]
Further, when the load bars 3 of the two front and rear transporting traveling bodies 1 are in a state of being in contact with each other, the end portions of the friction surfaces 15 of the both load bars 3 overlap each other by a certain length d in the front-rear direction. However, this configuration is not indispensable for the present invention. In some cases, as shown in FIG. 12, the front and rear load bars 3 are arranged with the protrusions 13 and 14 on the front and rear of the load bar overlapping each other. You may comprise so that the friction surface 15 of both the load bars 3 may mutually adjoin each other in the front-back direction when it mutually faces | abuts. Further, in the previous embodiment or the embodiment shown in FIG. 12, the total length L of the friction surface 15 of the load bar 3 and the distance D between the friction drive wheels 30 can be configured to be substantially equal.
[0032]
Furthermore, the friction drive conveyance device of the present invention is not limited to the conveyance device using the floor traveling carriage type conveyance traveling body 1 shown in the above embodiment, and any friction drive type conveyance device, for example, overhead traveling It can also be implemented as a friction drive device of the type trolley conveyor type.
[0033]
【The invention's effect】
The present invention can be implemented and used as described above, and according to the friction drive transport apparatus of the present invention, the traveling body detection sensor for transport provided in each friction drive wheel (the load of the embodiment). Based on the detection state of the bar sensor 32), one of the friction drive wheels that are in contact with the friction surface of the transport traveling body starts to drive when the lower friction drive wheel becomes empty, and Since the friction drive wheel away from the friction surface of the running body is driven by a very simple control, the conveyance running body can be moved forward when one lower friction drive wheel is free. However, in particular, according to the configuration of the present invention, the means for driving each friction drive wheel is a brakeless motor, which is the reverse of rotating the stopped friction drive wheel on the friction surface of the moving conveying traveling body. Small torque and friction The distance between the friction drive wheels is not longer than (the same or shorter than) the entire length of the friction surface of the transporting traveling body, and the distance between the friction driving wheels is facilitated by the inertia of the transporting traveling body after stopping the driving wheel. Due to the setting, as described in Patent Document 1 described above, there is a problem that is a concern when the distance between the friction drive wheels is longer than the total length of the friction surface of the transport traveling body, In this state, the linear friction surface area of the conveying traveling body is fitted between the friction driving wheels, so that the conveying traveling body is not reliably activated when the driving of the lower friction driving wheel is started. The problem of causing fear is solved, and the rear end of the friction surface of the transport traveling body does not move away from the stopped friction drive wheel on the upper side to the lower side only by movement due to the inertia of the transport traveling body. Even in the situation, the friction surface of the conveying It is possible to propel launch the conveying traveling body securely in the downstream side of the friction drive wheel that will reliably abut on the front end side of the Kosumen).
[0034]
  Moreover, the control means for controlling the drive motor (brakeless motor) of each friction drive wheel is configured using a central control device such as a computer installed at a position away from the transport path, and at least within a specific section. All the drive units (including friction drive wheels and their drive motors, sensors, etc.) and the central control unit (one control means) can be connected with cables. According to the configuration of the invention, a simple control means (control BOX) that can be constituted by a relay circuit or the like is provided for each drive unit, and each control means is connected by a single start signal transmission cable. The entire system can be configured simply by connecting to the cable, making wiring work extremely easy and easy, as well as changing the layout of the transport route. It can cope.
[0035]
  In addition, according to the structure of Claim 2, even if the movement amount by the inertia of the conveyance traveling body produced after the stop of the upper friction drive wheel which frictionally drives the conveyance traveling body is small, the said The friction surface of the transport traveling body is reliably separated from the upper friction drive wheel to the lower side, and the lower friction drive wheel is brought into contact with only the front end portion of the friction surface of the transport traveling body. It is possible to completely eliminate the resistance of the friction drive wheel in the stopped state on the upper side when the friction driving of the transport traveling body is started, and to start the friction driving of the transport traveling body more reliably.
[0036]
  In addition, when the distance between the friction drive wheels is configured to be equal to the entire length of the friction surface of the transport traveling body, if a plus error occurs in the distance between the friction drive wheels, the conveyance is performed even if the error is slight. Since there is a possibility that the traveling body stops at that position and cannot be friction driven, each friction drive wheel must be installed with high accuracy. According to the configuration of claim 3, each friction drive The distance between the wheels is shorter than the total length of the friction surface of the load bar, that is, the two front and rear friction drive wheels are in contact with the front and rear ends of the friction surface of one load bar. There is no problem even if a plus-side error occurs slightly in the interval, and it is easy to install each friction drive wheel. In addition, when a section in which the transport traveling body is stored in a state where each load bar abuts on the front and rear is generated, only one friction drive wheel is brought into contact with each stored transport traveling body (load bar). As with the case where the distance between the friction drive wheels is equal to the entire length of the friction surface of the load bar, it is easy to control each friction drive wheel for sending out the stored transport traveling bodies one by one. Can be done.
[Brief description of the drawings]
FIG. 1A is a side view showing an example of a transport traveling body, and FIG. B is a side view showing a configuration of a guide rail provided with a drive unit corresponding to the transport traveling body.
FIG. 2A is a partially cutaway plan view showing an example of a load bar included in a transport traveling body, and FIG. 2B is a side view with the same part cutout.
FIG. 3 is a schematic longitudinal sectional front view showing a conveying traveling body and a guide rail that supports and guides the conveying traveling body.
FIG. 4 is a partially cross-sectional plan view showing an example of a drive unit.
FIG. 5 is a side view showing the drive unit.
FIG. 6 is a longitudinal rear view showing the drive unit, the guide rail, and the load bar.
7A is a partially cross-sectional plan view showing a modification of the drive unit, and FIG. B is a side view showing the drive unit.
FIG. 8 is a longitudinal rear view showing the drive unit, the guide rail, and the load bar.
FIG. 9 is an explanatory diagram showing a guide rail unit, a drive unit attached to the guide rail unit, control means, and wiring relations.
FIG. 10 is an explanatory diagram for explaining the positional relationship between the load bar and each drive unit and the wiring relationship between the control means.
FIG. 11 is a flowchart for explaining the control content of each control means;
FIG. 12A is a partially cutaway plan view showing a modified example of the load bar, and FIG.
[Explanation of symbols]
1 Floor traveling cart type transporter
2 Guide rail
3 Load bar
5a-5d trolley
6 Central load bar
7 Front load bar
8 Rear load bar
13, 14 Protrusions at both ends of the load bar
13a, 14a Tapered tip of both ends protruding
15 Friction surface of load bar
20 York
22 Cable rack
23 Drive unit
24 Control means (control BOX)
29 Brakeless motor with reducer (eg cyclo reducer)
30 Friction drive wheel
31 Compression coil spring
32 Load bar sensor
33a Limit switch (load bar sensor)
33b Limit switch operation piece (load bar sensor)
39 Backup roller
40 Torsion coil spring
42 Guide rail unit
43 Power cable
44 Power supply cable
45 Power supply cable
46 Load bar sensor ON / OFF signal cable
47 Control cable for starting signal transmission and DC power supply for control circuit

Claims (3)

At least the drive unit to a specific section in the conveyance path is arranged, the drive unit includes a friction drive wheel that rotates in contact with the friction surface of the conveying traveling body, the brake-less motor for driving the friction drive wheels, and a sensor in which the friction drive wheel to detect whether the empty state in which no or some contact with the contact state with respect to the friction surface of the conveying traveling body, to the drive unit is the specific section of each drive unit In the friction drive transport device in which the friction drive wheels are arranged so as to be arranged at equal intervals not longer than the entire length of the friction surface of the transport traveling body, the brakeless motor included in each drive unit is controlled for each drive unit. The control means are connected to each other, and each control means is one upper side when the sensor included in one lower drive unit detects a friction drive wheel empty state. The control means connected to the drive unit are connected to each other by a cable for transmitting an activation signal, and each control means detects the friction drive wheel contact state by the sensor of the connected drive unit and is one lower side. When an activation signal is received from the control means via the cable, the friction drive wheel of the connected drive unit starts to be driven, and the sensor of the connected drive unit detects the friction drive wheel idle state. A friction drive conveying device configured to stop driving the friction drive wheels when   The friction drive conveyance device according to claim 1, wherein the friction drive wheels are arranged so as to be arranged at equal intervals substantially equal to the entire length of the friction surface of the conveyance traveling body.   The transport traveling body is provided with a load bar that constitutes a friction surface on the side surface, and projecting portions that extend in a cantilever manner are provided at both the front and rear ends of the load bar so as to project at different heights. When the two transport traveling bodies are closest to each other, the load bars are in contact with each other with the load bar rear end protruding portion of the front transport traveling body and the load bar front end protruding portion of the rear transport traveling body overlapping vertically. The friction surfaces of each load bar are configured so as to face each other, and the end portions of the friction surfaces of the two load bars are related to the front-rear direction when the load bars of the two front and rear transport traveling bodies face each other. It is formed so as to enter into the protrusions at the front and rear ends of the load bar so as to overlap by a certain length d, and the distance between the friction drive wheels of each drive unit is equal to the certain length d from the total length of the friction surface of the load bar. Set to a short distance The friction drive conveyor according to claim 1.

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