JP5383428B2 - Game board production line - Google Patents

Description

  The present invention relates to a game board production line for producing a game board used in a gaming machine represented by a pachinko machine or the like.

  Conventionally, gaming machines such as pachinko machines equipped with game boards and frames are well known. Such game boards and frames are individually manufactured on a game board production line and a frame production line, respectively, and these are organically and integrally assembled to complete a pachinko machine. Note that a general game board production line includes a nail driving line for driving game nails into the game board and a pallet truck transport line for transporting the pallet truck to which the game board is fixed at a constant speed. The nailing line is configured by arranging a plurality of nailing stations in series, and each nailing station has one nailing machine for nailing the game board. Further, the pallet carriage transport line is configured by arranging a plurality of work stations in series, and each work station has a screw tightening machine (for example, a screw tightening machine for performing a screw tightening of an accessory on a game board that has finished nailing. (See Patent Documents 1 and 2).

  By the way, it is conceivable to improve the work efficiency of various works by sharing the work (nailing or screwing) for one game board with a plurality of machines (nailing machine or screwing machine). However, since the game nail is required to have high positional accuracy, it is difficult to share the nail for one game board with a plurality of nailing machines because the game nail is likely to be displaced. On the other hand, since the position accuracy is not required as high as the game nail, it is possible to share the screw tightening of the role for one game board among a plurality of screw tightening machines. For example, when 10 screw tighteners are installed on the pallet truck transport line and each screw tightener is provided with 2 screwdriver units, for example, two screws are tightened simultaneously by one screw tightener. Therefore, when all the screw tighteners perform the screw tightening once, a maximum of 20 screws can be tightened.

JP-A-61-284335 (FIG. 1 and the like) JP-A-8-19923 (FIG. 1 etc.)

  However, when attaching an accessory using more than 20 screws, it is necessary to perform screw tightening twice or more at a specific work station. Even if the number of screws is 20 or less, if the positions of the two screws tightened by the screw tightener are separated from each other, it takes time to move the driver unit of the screw tightener. Moreover, the time required for screw tightening may vary due to individual differences such as the screw tightening machine, the accessory, and the screw. As a result, the time required for screw tightening at a specific work station is longer than at other work stations, so a large number of pallet trucks accumulate in a specific work station, and the pallet trucks collide with each other for reliable transport. There is a risk that it will not be possible. Therefore, despite the fact that the screw tightening of an object for one game board is shared by a plurality of screw tightening machines, the work in the entire game board manufacturing line does not flow smoothly, and the productivity of the game board is reduced. End up.

  Therefore, it is conceivable to improve the productivity of the game board by installing a speed adjusting device on the conveyor that conveys the pallet truck and increasing the speed of the entire conveyor using the speed adjusting device. However, the installation of the speed adjusting device takes time and the equipment cost also increases. Further, by increasing the speed of the entire conveyor, parts constituting the conveyor are likely to be consumed. Therefore, frequent maintenance must be performed by temporarily stopping the conveyor.

  The present invention has been made in view of the above problems, and its purpose is to perform screw tightening work so that the benefits of sharing screw tightening for one game board among a plurality of screw tightening machines can be fully enjoyed. Providing a game board production line that can improve the productivity of the game board without causing any inconvenience as a whole line by accelerating only the pallet truck in the vicinity of the specific work station with the longest time. There is to do.

In order to solve the above-mentioned problem, in the invention according to claim 1, in a game board production line including a pallet carriage transport line that transports a pallet carriage capable of fixing a game board at a constant speed, the pallet carriage transport line includes: It is configured by arranging in series a plurality of work stations provided with a screw tightening machine for screwing a feature to a game board fixed on the pallet carriage, and from among the plurality of work stations A first pallet truck located in the area between the selected specific work station and the work station immediately preceding the specific work station and located at the specific work station; and The second pallet truck contacting the rear part in the conveying direction of the pallet truck is accelerated to a speed faster than the constant speed. Comprising a quick means, said game board as triggered by the to the specific work station first pallet truck has been loaded, together with the first pallet truck is stopped by carriage stopping means, said first A first step in which work on the game board fixed on the pallet truck is started, and during execution of work on the game board fixed on the first pallet truck, the second pallet truck A second step of stopping in contact with a rear portion in the transport direction of the first pallet truck located at the specific work station; and an operation for the game board fixed on the first pallet truck. Triggered by the completion, by releasing the stop of the first pallet truck by the carriage stop means, by the pallet truck transport line, It is manufactured through a third step in which the discharge of the first pallet truck from the specific work station is started and the entry of the second pallet truck into the specific work station is started at the same time. In the third step, the acceleration means detects the first pallet truck and the second pallet truck when the entry of the second pallet truck to the specific work station is detected. Accelerating to a speed faster than the constant speed, and simultaneously completing the discharge of the first pallet truck from the specific work station and the entry of the second pallet truck to the specific work station, The work station has the longest working time of the screw tightening among the plurality of work stations, and before the screw tightening is completed. The work station that has the shortest discharge time until the pallet truck is discharged, and the total time of the work time at the specific work station and the discharge time of the pallet truck from the specific work station is A game board production line characterized by being equal to a total time of a work time at a work station different from the work station and a discharge time of the pallet truck from the other work station. .

  Therefore, according to the first aspect of the present invention, the screw tightening for one game board can be shared by a plurality of screw tightening machines provided for each work station. be able to. Moreover, the acceleration means is faster than a constant speed for the first pallet cart located at the specific work station and the second pallet cart contacting the rear part in the transport direction of the first pallet cart. Accelerates to speed. Thereby, since the discharge time for discharging the pallet truck from the specific work station is shortened, the total time of the discharge time and the work time for screwing the accessory is also shortened. Further, according to the first aspect, since the total time at a specific work station is equal to the total time at another work station, the work in the entire game board production line smoothly flows. As a result, the pallet carriage can be smoothly transported at all the work stations, so that the productivity of the game board can be improved without causing the inconvenience that the work in the entire line does not flow smoothly.

  According to the first aspect of the present invention, the acceleration means is provided only in the area between the specific work station and the immediately preceding work station. However, since the pallet truck is transported at a constant speed without being accelerated in an area other than the above-described area, the consumption of parts in the entire pallet truck transport line caused by the acceleration of the pallet truck by the acceleration means is suppressed. be able to.

  In addition, although it does not specifically limit as said acceleration means, For example, the press means which presses the rear part in the conveyance direction of a 2nd pallet trolley, the tension means which pulls the 2nd pallet trolley in a conveyance direction, etc. can be mentioned. If the acceleration means is a pressing means, the acceleration means can be easily located in a region between the specific work station and the immediately preceding work station. Here, since the above area is an empty area where there is no screwing machine, it is easy to arrange the acceleration means.

  According to a second aspect of the present invention, in the first aspect, the screw tightening machine performs screw tightening of a plurality of types of accessories having different sizes, and is a work station located on the start end side of the pallet truck transport line. The gist of the screw tightening machine is to perform screw tightening of an accessory having a relatively small size among the plurality of types of accessory.

  Therefore, according to the second aspect of the present invention, since a relatively small size, a light accessory, that is, an accessory that can be easily removed simply by touching, is screwed at an early stage, thereby preventing the loss of the accessory. be able to. If a relatively large accessory is screwed at an early stage, it will be used when the accessory is removed due to vibrations that occur when the pallet truck is transported or due to poor attachment of the accessory due to bending of the game board. An object may damage the design surface (game board surface) of the game board. Also, generally, when screwing an accessory, since a large number of game nails have already been driven into the game board, if the accessory is removed, the accessory may be damaged by the game nail.

  The screw tightening machine is for tightening a plurality of types of articles having different weights, and the closer the work station is located at the start end side of the pallet carriage transport line, It is also possible to fasten a relatively light accessory among a plurality of types of accessories. Even in this case, since the accessory which is relatively light and easily removed by touching is screwed at an early stage, loss of the accessory can be prevented.

  The gist of a third aspect of the present invention is that, in the first or second aspect, the screw tightening machine includes a plurality of driver units for performing screw tightening of the accessory.

  Therefore, according to the third aspect of the present invention, it is possible to perform a number of screw tightening operations at one work station as compared with the case where the screw tightening machine has only one driver unit. As a result, the productivity of the game board will be further improved.

  Here, the screw fastening machine may be provided with two driver units or may be provided with three or more driver units, but it is particularly preferable that two screw units are provided. If the screw tightening machine includes three or more driver units, the driver units may interfere with each other during screw tightening. In addition, when the number of screws required for attaching the accessory is small, an unnecessary screw fastening machine is generated. In addition, since the empty space in the work station becomes small, it is difficult to perform maintenance on the screw fastening machine by putting a hand in the work station.

  In addition, when the said screw fastening machine is provided with two or more driver units, it is preferable that the attachment position of the accessory fastened by each driver unit is mutually spaced apart. In this way, each driver unit moves to a location away from each other, so that it is difficult for the driver units to interfere with each other during screw tightening.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the acceleration unit protrudes in the same direction as the transport direction from the acceleration unit main body and the acceleration unit main body. The gist of the present invention is a pressing actuator including a pressing member that presses the rear portion of the pallet carriage 2 in the conveying direction.

  Therefore, according to the fourth aspect of the present invention, the second pallet truck contacts the rear part in the transport direction of the first pallet truck located at the specific work station, and the second pallet truck in the transport direction of the second pallet truck. Since the rear portion is pressed by the pressing actuator, which is an acceleration means, the acceleration means is located behind the specific work station. Therefore, it becomes easy to arrange the acceleration means in the area between the specific work station and the previous work station.

  Here, the pressing actuator is not particularly limited, and examples thereof include an air cylinder and a servo motor. The air cylinder includes a cylinder body that is an acceleration means body and a piston rod that is a pressing member driven by air pressure. The servo motor is composed of a motor main body that is an acceleration means main body and a piston rod that is a pressing member. For example, a pinion gear attached to a rotation shaft of the servo motor and a rack gear that is provided on a side surface of the piston rod and meshes with the pinion gear. The piston rod is driven via the. The pressing actuator is preferably an air cylinder. In this way, the operating speed of the piston rod can be easily changed only by adjusting the air pressure.

  According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the locking member that can be locked to the rear portion of the second pallet carriage is moved to the front end portion of the pressing member, and the locking member is moved in the vertical direction. Locking member moving means is provided, and the locking member is displaced to an upper position locked to the rear portion of the second pallet carriage and a lower position not locked to the rear portion of the second pallet truck. In the case where the pressing member is immersed in the acceleration means main body, when the pressing member passes below the third pallet carriage located behind the second pallet carriage, the engagement is performed. When the stop member is lowered from the upper position to the lower position and the pressing member has passed the lower side of the third pallet carriage, the locking member is raised from the lower position to the upper position. This is the gist.

  Therefore, according to the fifth aspect of the present invention, when the locking member is raised to the upper position, the locking member is locked to the rear portion of the second pallet truck, so that the second pallet truck is reliably pressed by the locking member. be able to. In addition, since the locking member descends to the lower position when the pressing member passes below the third pallet truck, the conveyance of the third pallet truck does not have to be obstructed by the locking member.

  Here, the locking member moving means is not particularly limited. For example, the locking member moving actuator such as an air cylinder or a solenoid that moves the locking member in the vertical direction, or the locking member is attached upward. A biasing member such as a spring to be biased can be used. The locking member moving means is a biasing member that biases the locking member upward, and the locking member is a third pallet when the pressing member is immersed in the acceleration means main body. It is preferable to descend from the upper position to the lower position against the urging force of the urging member by contacting the bottom surface of the carriage. In this way, the structure of the locking member moving means becomes simpler than the case of the actuator for moving the locking member, and the drive control of the locking member moving means becomes unnecessary. The means can be easily established at low cost.

  As detailed above, according to the first to fifth aspects of the present invention, the screw tightening operation is performed so that the advantage of sharing the screw tightening for one game board among a plurality of screw tightening machines can be fully enjoyed. Providing a game board production line that can improve the productivity of the game board without causing any inconvenience as a whole line by accelerating only the pallet truck in the vicinity of the specific work station with the longest time. can do. In particular, according to the invention described in claim 3, the work efficiency of screw tightening is improved, and the productivity of the game board is further improved.

The front view which shows the game board of this embodiment. The flowchart which shows the outline of a game board process. The schematic block diagram which shows a pallet trolley | bogie conveyance line. The top view which shows a pallet trolley | bogie conveyance line. The side view which shows a pallet trolley | bogie conveyance line. (A) is a front view which shows a screwing machine, (b) is a side view which shows a screwing machine. The top view which shows a pallet trolley | bogie. The front view which shows a pallet trolley | bogie. The side view which shows a pallet trolley | bogie. The rear view which shows a pallet cart. The top view which shows a trolley | bogie lock. The top view which shows a trolley | bogie stopper. (A) is a top view which shows an air cylinder, (b) is a side view which shows an air cylinder. (A), (b) is explanatory drawing which shows a game board process. (A), (b) is explanatory drawing which shows a game board process. (A), (b) is explanatory drawing which shows a game board process. (A), (b) is explanatory drawing which shows a game board process. The schematic block diagram which shows the pallet truck conveyance line in other embodiment.

  Hereinafter, an embodiment in which the present invention is embodied as a game board manufacturing line 21 used for manufacturing a game board 11 of a pachinko machine will be described in detail with reference to the drawings.

(1) Configuration of the Game Board 11 The game board 11 shown in FIG. 1 has a substantially square outer shape. The game board surface 11a includes an arc-shaped outer rail 12a and an inner side of the outer rail 12a. An arc-shaped inner rail 12b arranged is laid. A plurality of windmills 13, a plurality of game nails 14 projecting from almost the entire game area 12, and the like are disposed in the game area 12 that is an inner area of the rails 12 a and 12 b. The windmill 13 and the game nail 14 change the direction of the game ball flowing down in the game area 12. Here, the game board 11 of the present embodiment is a game board (large game board) larger than a general game board (small game board) having a substantially square shape of 471.5 mm long and 446.5 mm wide. It has a substantially square shape of length 500 mm × width 482 mm.

  Further, a frame-shaped center accessory 15 having an opening is disposed at a substantially central portion of the game area 12. The center accessory 15 is fixed to the game board 11 by screwing using nine screws 10 (see FIGS. 6A and 6B). A symbol display device (not shown) for displaying a symbol variation game that varies a plurality of types of symbols is disposed on the back side of the center accessory 15.

  As shown in FIG. 1, below the center accessory 15, a start winning device 16 including a normal electric accessory that is opened and closed by a normal electric accessory solenoid (not shown) is disposed. The start winning device 16 is fixed to the game board 11 by tightening a start opening 16a using two screws 10. When a game ball is detected by the start winning device 16, a symbol change game is performed by the symbol display device, and award balls are paid out. Also, below the start winning device 16, a large winning device 17 that is opened and closed by a large winning port solenoid (not shown) is disposed. The big prize device 17 is fixed to the game board 11 by tightening the big prize mouthpiece 17a using four screws 10. Further, a left side decoration 18 having general winning devices 18a to 18c is arranged on the left side of the big winning device 17, and a right side decoration 19 having a general winning device 19a is arranged on the right side of the big winning device 17. It is arranged. The left side decoration 18 and the right side decoration 19 are each fixed to the game board 11 by tightening screws using three screws 10. A game ball detection switch (not shown) for detecting a winning game ball is provided behind the start winning device 16, the big winning device 17, and the general winning devices 18a to 18c, 19a. When a game ball is detected by each game ball detection switch, a predetermined number of prize balls are paid out.

  As shown in FIG. 1, a gate 20 having a function of detecting the passage of a game ball is provided on the left side of the center accessory 15. The gate 20 is fixed to the game board 11 by screwing using two screws 10. In addition, a gate switch (not shown) that detects a passed game ball is provided in the back of the gate 20. Note that when a game ball is detected by the gate switch, a random number is acquired, and the ordinary electric accessory solenoid is driven based on a result of determining whether or not the acquired random number is a predetermined random value. Since the ordinary electric accessory is released by such determination (hit determination), it becomes easier for the game ball to win the start winning device 16.

(2) Manufacturing process of pachinko machine The pachinko machine provided with the game board 11 described above is manufactured in the order of the game board process → the middle frame process → the final process.

  In the game board process, the game board 11 is manufactured. More specifically, as shown in FIG. 2, the game board 11 is in the order of a cell pasting step S1, a veneering step S2, a nail driving step S3, an accessory screw tightening step S4, a rail press-fitting step S5, and a board mounting step S6. Manufactured by. In the cell pasting step S1, the cell is pasted on the surface of the plywood constituting the game board 11 via an adhesive. In the veneer processing step S2, multi-axis drilling is performed on the game board 11 to make positioning holes 41a and 41b (see FIGS. 8 to 10), rail pin holes, and the like. In the nail driving step S3, a plurality of game nails 14 are driven into the game board 11. In the bonus screw tightening step S4, a plurality of types of bonuses (a center bonus 15, a start opening 16a, a prize winning opening 17a, a left side decoration 18, a right side decoration 19, and a gate 20) are added to the game board 11. Screw tightening is performed. In the rail press-fitting step S5, the rails 12a and 12b are press-fitted into the game board 11. In the board attaching step S6, a display control board (not shown) for controlling the symbol display device is attached.

  In the middle frame step, the lower ball tray is attached to the middle frame constituting the machine body, the front frame is attached to the middle frame, the upper ball tray is attached to the front frame, the game board 11 is joined, and a not-shown hit ball Assembling work of various parts such as a launching device, a set board, and a sound control board is sequentially performed.

  In the final process, the outer frame that forms the outer shell of the machine, the assembly work of the power supply board, payout control board, main control board, etc., not shown, function inspection, lot registration, various numbers (warranty number, management number, etc.) Etc. are performed. Thereafter, pachinko machines are packed and shipped for each shipping destination (game hall).

  By the way, when the nailing process S3 and the accessory screw tightening process S4 are executed in the game board process, the game board 11 is conveyed by the game board manufacturing line 21. Hereinafter, the game board production line 21 will be described.

(3) Configuration of Game Board Production Line 21 As shown in FIG. 3, the game board production line 21 is used in a nail driving line (not shown) used in the nail driving step S3 and in the accessory screw tightening step S4. And a pallet carriage transport line 24. The nail driving line and the pallet truck conveying line 24 are straight lines, and the end of the nail driving line is connected to the starting end of the pallet truck conveying line 24. Therefore, the game board production line 21 has a route through which the game board 11 flows in the order of the nail driving line → the pallet carriage transport line 24.

  The nail driving line is configured by arranging ten nail driving stations in series, and a nail driving machine (not shown) for driving the game nail 14 into the game board 11 is provided in each nail driving station. Are installed one by one. In the present embodiment, nailing with respect to one game board 11 is performed by one nailing machine. In addition, since the back surface of the game board 11 is flat when the nail driving step S3 is performed, the nail driving line is transported with the game board 11 placed on a conveyor.

  On the other hand, the pallet truck transport line 24 transports the pallet truck 30 to which the game board 11 can be fixed at a constant speed (21 m / min in this embodiment). That is, since the wiring cord (not shown) is extended from the back side of the game board 11 at the time when the accessory screw tightening step S4 is performed, the pallet carriage transport line 24 fixes the game board 11 to the pallet carriage 30. It is designed to be transported in this state. As shown in FIGS. 3 to 5, the total length of the pallet truck transport line 24 is set to several meters to several tens of meters, and the transport direction of the pallet truck 30 (in the direction of arrow F <b> 1 shown in FIGS. 3 and 4). A line main body 26 extending in the direction is provided. The line body 26 includes a plate-like support base 26a. The support table 26 a is arranged in parallel to the installation surface of the pallet carriage transport line 24.

  As shown in FIGS. 4 and 5, the pallet carriage transport line 24 includes a pair of transport rail portions 25 extending along the transport direction on the upper surface of the support base 26 a. Both transport rail portions 25 have a substantially L-shaped cross section, and a pair of drive chains 27 are provided along the transport direction. Both drive chains 27 are always driven by a rotary drive motor 29 (see FIG. 3). Both drive chains 27 are configured to transport the pallet cart 30 along the transport direction in a state of being separated from the upper surface of the support platform 26a by contacting both ends of the pallet cart 30. Further, the pallet carriage transport line 24 is configured by arranging ten work stations A1 to A10 in series for performing screw fastening of the above-mentioned accessory on the game board 11 fixed on the pallet carriage 30. Yes.

(3-1) Configuration of Screw Fastening Machine 80 Each work station A1 to A10 has a screw fastening machine 80 (see FIGS. 6 (a) and 6 (b)) for tightening a screw for an accessory to the game board 11. One unit is installed. Each screwing machine 80 is provided with two driver units 80a and 80b for screwing an accessory. For this reason, when one screw fastening machine 80 is used, the work of fastening two screws 10 at a time can be performed. Therefore, if all the screw tightening machines 80 perform screw tightening once, a maximum of 20 screws 10 can be tightened.

  The driver units 80 a and 80 b include a driver bit 81, a suction pipe 82, a pair of chuck claws 83, and a screw supply device 84. The suction pipe 82 extends in the vertical direction in the driver bit 81. The pair of chuck claws 83 are configured to grip the screw 10 when switched to a closed state in which a screw receiving space is generated. The screw supply device 84 supplies the screw 10 into the screw receiving space with the head thereof facing up. When the driver units 80a and 80b are driven, the rotating shaft 85 of the driver bit 81 rotates and the screw 10 held by the pair of chuck claws 83 rotates.

  The driver units 80a and 80b shown in FIGS. 6A and 6B include an air cylinder 90. The air cylinder 90 includes a cylinder body 92 and a piston rod 93 that moves up and down by air pressure. The piston rod 93 is fixed to the driver units 80a and 80b, and protrudes downward from the cylinder body 92, thereby lowering the entire driver units 80a and 80b.

  Further, the screw fastening machine 80 includes a suction device (not shown) and a motor driver circuit (not shown). The adsorption device is configured to adsorb the screw 10 with a negative pressure inside the adsorption pipe 82. The motor driver circuit is configured to rotationally drive the rotary shaft 85 via the driver units 80a and 80b.

  In addition, each screwing machine 80 performs the screwing of the above-mentioned accessory from which size and weight differ. And each screwing machine 80 is the work station located in the starting end side of the pallet truck conveyance line 24, and is relatively small in size among each accessory, and is relatively lightly screwing the accessory. To do. More specifically, the screw fastening machine 80 installed in the work station A1 uses two screws 10 to fasten the gate 20 with screws. The screw fastening machine 80 installed in the work station A2 uses two screws 10 to fasten the start opening decoration 16a. The screw fastening machines 80 installed at the work stations A3 and A4 are configured to fasten the special prize opening ornament 17a using two screws 10 (four screws 10 in total). The screw fastening machine 80 installed at the work station A5 uses the three screws 10 to fasten the left side decoration 18 and also uses the single screw 10 to tighten the right side decoration 19. It has become. The screw fastening machine 80 installed at the work station A6 is configured to fasten the right side decoration 19 with two screws 10. The screw fastening machines 80 installed in the work stations A7 to A9 are configured to fasten the center accessory 15 using two screws 10 (6 screws 10 in total). The screw fastening machine 80 installed in the work station A10 is configured to fasten the center accessory 15 using three screws 10. That is, in this embodiment, the screws are tightened in the order of the gate 20 → the start opening decoration 16a → the grand prize opening decoration 17a → the left side decoration 18 → the right side decoration 19 → the center accessory 15. In the present embodiment, all screw fastenings for one game board 11 are shared by 10 screw fastening machines 80. In the present embodiment, the attachment positions of the accessories to be screwed by the driver units 80a and 80b are separated from each other. For example, the screw tightening machine 80 installed at the work station A3 uses a screwdriver unit 80a to fasten the upper left portion of the big prize mouthpiece 17a and also uses the driver unit 80b to upper right part of the big prize mouthpiece 17a. The screws are tightened. Therefore, the driver units 80a and 80b are configured not to interfere with each other when screwing the accessory.

(3-2) Configuration of Carriage Detection Sensor 28 As shown in FIGS. 3 and 4, the pallet carriage transport line 24 includes a carriage detection sensor 28. The cart detection sensor 28 is located in each of the areas B1 and B2 between the specific work stations A5 and A10 selected from the work stations A1 to A10 and the work stations A4 and A9 immediately before the work stations A5 and A10. Has been placed. More specifically, the cart detection sensor 28 is provided above the transport rail portion 25 in the vicinity of the end of each of the regions B1 and B2. The trolley detection sensor 28 outputs a trolley detection signal when the entry of the pallet trolley 30 from the area B1 (or area B2) to the work station A5 (or work station A10) is detected. In the work stations A5 and A10, the number (4 or 3) of the screws 10 to be screwed is screwed at the work stations A1 to A4 and A6 to A9 different from the work stations A5 and A10. More than 10 (2). In addition, the movement distances of the driver units 80a and 80b in the work stations A5 and A10 are longer than the movement distances of the driver units 80a and 80b in the work stations A1 to A4 and A6 to A9. Therefore, the work stations A5 and A10 are the work stations having the longest screw tightening work time among the work stations A1 to A10. In the present embodiment, the work time Ta1 at the work stations A5 and A10 is 12 seconds, while the work time Ta2 at the work stations A1 to A4 and A6 to A9 is 10 seconds. Areas B1 and B2 are empty areas where a screw fastening machine 80, which is a mechanism for performing screw fastening work, does not exist.

(4) Configuration of Pallet Carriage 30 As shown in FIGS. 4, 5, and 7 to 9, the pallet carriage 30 includes a base frame 31 that has a substantially square shape of 500 mm in length × 500 mm in width. The base frame 31 is composed of a metal plate-like object, and is composed of iron in the present embodiment. In addition, the base frame 31 may be comprised by other members, such as a synthetic resin. A rectangular storage frame 32 is provided at the center of the base frame 31, and a wiring cord connected to the game board 11 is stored inside the storage frame 32. On the outside of the storage frame 32, four support columns 34 having a rectangular cross section and two support columns 35 having a hexagonal cross section are provided, and the game board 11 is placed on the upper ends of the support columns 34, 35. It has come to be. In addition, impact buffer plates 36 and 37 made of synthetic resin or the like are provided at the upper ends of the columns 34 and 35. The impact buffer plates 36 and 37 alleviate the impact when the game board 11 is disposed at the upper end of each of the columns 34 and 35.

  As shown in FIGS. 5 and 7 to 9, wheels 38 are provided at the four corners of the bottom of the base frame 31, respectively. Each wheel 38 is configured to smoothly convey the pallet carriage 30 along the conveyance rail section 25 by rotating when the pallet carriage 30 is disposed on the pair of conveyance rail sections 25 described above. A friction plate 39 is provided on the side surface of the base frame 31. The drive chain 27 is in contact with the friction plate 39 when the pallet carriage 30 is transported. Due to this contact, a suitable frictional resistance acts between the friction plate 39 and the drive chain 27.

  Further, positioning pin fixing portions 42, 43, 44 project from the outer peripheral portion of the base frame 31. Specifically, one positioning pin fixing portion 42 is provided on the outside of the storage frame 32 and in the vicinity of one diagonal corner (the lower right corner in FIG. 7). Two positioning pin fixing portions 43 and 44 are provided in the vicinity of the other corner (the upper left corner in FIG. 7). Each positioning pin fixing part 42-44 is provided with the positioning pin 46 inserted in the hole 41a, 41b for positioning provided in the game board 11 (refer FIGS. 8-10).

  When the large game board (game board 11) is fixed to the pallet carriage 30, the positioning pin 46 of the positioning pin fixing portion 42 is inserted into the hole 41a, and the positioning pin 46 of the positioning pin fixing portion 44 is inserted into the hole 41b. Inserted (see FIGS. 8 to 10). As a result, the game board 11 is fixed to the approximate center of the pallet carriage 30. On the other hand, when the small game board is fixed to the pallet carriage 30, the positioning pin 46 of the positioning pin fixing portion 42 is inserted into one hole, and the positioning pin 46 of the positioning pin fixing portion 43 is inserted into the other hole. . In this embodiment, the positioning pins 46 of the positioning pin fixing portions 42 and 44 are provided so as not to move in the vertical direction, while the positioning pins 46 of the positioning pin fixing portion 43 are provided so as to be able to advance and retreat in the vertical direction. That is, when the large game board is fixed, the positioning pin 46 of the positioning pin fixing portion 43 is retracted downward so that it does not interfere with the large game board.

  As shown in FIGS. 4, 7, 9, and 10, a pair of impact absorbing members 47 project from the rear portion of the pallet carriage 30 in the conveying direction. Both the shock absorbing members 47 are rubber members formed in a cylindrical shape, and are for reducing the impact when colliding with the pallet truck 30 located at the rear. Both shock absorbing members 47 are spaced apart from each other on the side surface 31 a of the base frame 31. Further, the protruding amounts (dimensions in the transport direction) of both the shock absorbing members 47 are equal to each other. The both shock absorbing members 47 are attached to the base frame 31 via attachment shafts 47 a that are provided on the side surface 31 a of the base frame 31.

(5) Configuration of Bogie Lock 51 and Bogie Stopper 61 As shown in FIGS. 3 to 5 and 11, the pallet carriage conveyance line 24 is moved to the work station A5 (or work station A10). Is provided with a cart lock 51 for stopping the operation. The trolley lock 51 is respectively disposed in the area where the work stations A5 and A10 exist on the upper surface of the support base 26a. Further, the cart lock 51 is arranged on the terminal side of each of the work stations A5 and A10, and is arranged at the center portion in the width direction of the pallet cart conveyance line 24.

  The carriage lock 51 includes a lock air cylinder 52. The lock air cylinder 52 includes a cylinder body 53 and a piston rod 54 driven by air pressure. The cylinder body 53 is accommodated in a cylinder accommodation hole 55 penetrating the support base 26 a, and the end of the work station A 5 (or work station A 10) on the end side is located in the cylinder accommodation hole 55 in the pallet carriage transport line 24. Is supported by a support bar 56 extending along the width direction of the. As a result, the cylinder main body 53 has the end on the end side of the work station A5 (or work station A10) positioned upward, and the end on the start end side of the work station A5 (or work station A10) positioned below. Therefore, it inclines with respect to the upper surface of the support stand 26a (refer Fig.14 (a)).

  On the other hand, as shown in FIG. 11 and the like, the piston rod 54 protrudes from the cylinder body 53 in the same direction as the conveying direction. Further, a block-shaped lock piece 57 is provided at the tip of the piston rod 54, and the tip surface (the front end surface in the transport direction) of the lock piece 57 is inclined with respect to the width direction of the pallet carriage transport line 24. doing. When the piston rod 54 protrudes from the cylinder body 53, the lock piece 57 is guided between a pair of guide members 58 protruding from the upper surface of the support base 26a. A cylindrical first engaging portion 59 provided on the bottom surface of the pallet carriage 30 is guided between the guide members 58 when the piston rod 54 is immersed in the cylinder body 53. ing. Therefore, when the piston rod 54 protrudes from the cylinder main body 53, the lock piece 57 is engaged with the first engagement portion 59 guided between the two guide members 58 from the rear, so that the conveying direction of the pallet carriage 30 is increased. Is designed to prevent movement in the opposite direction.

  As shown in FIGS. 3 to 5 and 12, the pallet carriage transport line 24 includes a carriage stopper 61 that stops the pallet carriage 30 carried into the work station A5 (or the work station A10). The cart stoppers 61 are respectively arranged in the areas where the work stations A5 and A10 exist on the upper surface of the support table 26a. Further, the carriage stopper 61 is arranged on the start end side of each of the work stations A5 and A10, and is arranged at the center portion in the width direction of the pallet carriage conveyance line 24. The cart stopper 61 is disposed at a location different from the cart lock 51 in the width direction of the pallet cart transport line 24.

  The carriage stopper 61 includes a pair of support members 62 projecting from the upper surface of the support base 26 a and a stopper plate 63 disposed between the support members 62. The stopper plate 63 is driven by a rotation actuator (not shown), so that the work station A5 (or the work station A10) at the pair of bearing portions 63a and the supporting members 62 at the base end portion of the stopper plate 63 is started. It is configured to rotate around a rotation shaft 64 that penetrates the end of the shaft. The stopper plate 63 is accommodated in a stopper accommodation hole 65 whose end on the distal end side penetrates the support base 26a during rotation. Further, a stopper piece 66 having a block shape is provided at the distal end portion of the stopper plate 63, and a cylindrical rod-like portion extending along the conveyance direction is provided at the distal end surface (front end surface in the conveyance direction) of the stopper piece 66. 67 is connected. On the other hand, the base end surface of the stopper piece 66 (the end surface on the rear side in the transport direction) is inclined with respect to the width direction of the pallet carriage transport line 24. Further, from the base end surface of the stopper piece 66, a rod-like pin 68 extending along the transport direction protrudes. Note that a cylindrical second engagement portion 69 provided on the bottom surface of the pallet carriage 30 is guided between the support members 62 when not rotating. Therefore, the pin 68 is engaged with the second engagement portion 69 guided between the support members 62 from the front, thereby preventing the pallet carriage 30 from moving in the transport direction. When the stopper plate 63 rotates, the engagement between the pin 68 and the second engagement portion 69 is released. Accordingly, the pallet carriage 30 is temporarily stopped at the work stations A5 and A10 by two mechanisms, the carriage lock 51 and the carriage stopper 61.

(6) Configuration of Air Cylinder 71 As shown in FIGS. 3 to 5 and 13, the pallet carriage transport line 24 includes an air cylinder 71 that is an “accelerating means” and a “pressing actuator”. The air cylinder 71 is disposed in the regions B1 and B2 on the upper surface of the support base 26a. Therefore, the above-described cart lock 51 and the cart stopper 61 are arranged in front of the air cylinder 71 in the transport direction on the upper surface of the support table 26a. In addition, the air cylinder 71 is disposed on the start end side of the regions B <b> 1 and B <b> 2 and is disposed closer to the end portion in the width direction of the pallet carriage transport line 24. Therefore, the air cylinder 71 is disposed at a location different from the cart lock 51 and the cart stopper 61 in the width direction of the pallet cart transport line 24.

  The air cylinder 71 includes a pallet cart 30 (first pallet cart 30a) located at the work stations A5 and A10 and a pallet cart 30 (in contact with the rear portion in the transport direction of the first pallet cart 30a). The second pallet truck 30b) is accelerated to a speed faster than a constant speed (21 m / min) (see FIG. 15B). Therefore, among the work stations A1 to A10, the work stations A5 and A10 are work stations having the shortest discharge time from the end of screw tightening until the pallet carriage 30 is discharged. In this embodiment, the discharge time Tb1 of the pallet truck 30 from the work stations A5 and A10 is 3 seconds, while the discharge time Tb2 of the pallet truck 30 from the work stations A1 to A4 and A6 to A9 is 5 seconds. Yes. Accordingly, the total time (15 seconds) of the work time Ta1 (12 seconds) at the work stations A5 and A10 and the discharge time Tb1 (3 seconds) is the work time Ta2 (10 at the work stations A1 to A4 and A6 to A9. Second) and the total time (15 seconds) of the discharge time Tb2 (5 seconds).

  As shown in FIGS. 3 to 5 and 13, the air cylinder 71 includes a cylinder body 72 that is an “acceleration means body” and a piston rod 73 that is a “pressing member” driven by air pressure. Yes. The piston rod 73 projects from the cylinder body 72 in the same direction as the transport direction. Furthermore, a locking member 75 and a spring 76 that is a “locking member moving means” are provided at the tip 74 of the piston rod 73. A part of the front end surface (upper end surface) of the locking member 75 is inclined with respect to the transport direction. Further, the locking member 75 is displaced to an upper position (see FIG. 13B) that is locked to the rear part of the second pallet truck 30b and a lower position that is not locked to the rear part of the second pallet truck 30b. It is like that. Note that the locking member 75 can be locked to a region R1 where the impact absorbing member 47 is not projected at the rear portion of the second pallet carriage 30b in a state of being displaced to the upper position. The region R1 is a region located outside the pair of shock absorbing members 47 at the rear part of the second pallet carriage 30b. And if the piston rod 73 protrudes from the cylinder main body 72 in the state which the latching member 75 latched to area | region R1, the latching member 75 will press the rear part in the conveyance direction of the 2nd pallet truck 30b. Become.

  As shown in FIGS. 5 and 13, the spring 76 urges the locking member 75 upward to move in the vertical direction. The spring 76 is housed in the distal end portion 74, one end portion (base end portion) is fixed to the bottom portion of the distal end portion 74, and the other end portion (leading end portion) is fixed to the lower surface of the locking member 75. Has been. When the piston rod 73 is immersed in the cylinder body 72, the locking member 75 comes into contact with the bottom surface of the third pallet carriage 30c located behind the second pallet carriage 30b, thereby It is lowered from the upper position to the lower position against the urging force (see FIG. 17A).

(7) Electrical Configuration of the Game Board Manufacturing Line 21 As shown in FIG. 3, the game board manufacturing line 21 includes a control unit 100 that controls the entire game board manufacturing line 21. The control unit 100 includes a CPU 101, and a ROM 102 and a RAM 103 are connected to the CPU 101. The CPU 101 executes various processes for controlling the entire game board production line 21 and calculates various control commands according to the processing results. The CPU 101 outputs a control command as a predetermined control signal. The ROM 102 stores a control program for controlling the game board production line 21. The RAM 103 temporarily stores various information necessary for the operation of the game board production line 21.

  The CPU 101 is connected to the air cylinder 90, the bogie lock 51 (locking air cylinder 52), the bogie stopper 61 (rotating actuator), the air cylinder 71, and the like of the screw fastening machine 80 via driver circuits (not shown). Are connected and controlled to drive them. Further, the CPU 101 is connected to the driver units 80a and 80b via motor driver circuits (not shown), and drives and controls them. Further, a cart detection sensor 28 is connected to the CPU 101.

  Next, the accessory screw tightening step S4 executed in the pallet carriage transport line 24 will be described in detail with reference to the drawings.

  As shown in FIG. 2, in the accessory screw tightening step S4, the work is performed in the order of the first step S4-1 → second step S4-2 → third step S4-3. In the first step S4-1, the CPU 101 has received the first pallet truck 30a into the work station A5 (or work station A10) (that is, the car detection signal is input from the car detection sensor 28). As a trigger, a drive signal is output to the cart lock 51 and the cart stopper 61. As a result, after the piston rod 54 constituting the bogie lock 51 protrudes from the cylinder body 53, the lock piece 57 is engaged with the first engaging portion 59 of the first pallet bogie 30a from the rear, whereby the first Movement of the pallet carriage 30a in the direction opposite to the conveyance direction is prevented. In addition, after the stopper plate 63 constituting the carriage stopper 61 is rotated by the rotation actuator, the pin 68 engages with the second engagement portion 69 of the first pallet carriage 30a from the front, whereby the first pallet. Movement of the carriage 30a in the conveyance direction is prevented. Accordingly, the first pallet cart 30a is stopped by the cart lock 51 and the cart stopper 61 (see FIG. 14A), and screw tightening for the game board 11 fixed on the first pallet cart 30a is started. .

  Screw tightening for the game board 11 is performed as follows. In other words, the CPU 101 performs control to drive a first motor (not shown) that moves the screw fastening machine 80 in the vertical direction and a second motor (not shown) that moves the screw fastening machine 80 in the lateral direction, and tightens the screw fastening machine. The machine 80 is moved to the attachment position of the accessory. When the screw fastening machine 80 reaches the mounting position, the CPU 101 performs control to drive the screw supply device 84 and supplies the screw 10 into the screw receiving space generated by the pair of chuck claws 83. Next, the CPU 101 outputs a drive signal to the air cylinder 90 and immerses the piston rod 93 in the cylinder body 92. Further, the CPU 101 outputs a drive signal to the adsorption device, and adsorbs the screw 10 by making the inside of the adsorption pipe 82 a negative pressure. Further, the CPU 101 outputs a drive signal to the motor driver circuit and rotationally drives the rotary shaft 85 via the driver units 80a and 80b. As a result, the screw 10 is held by the driver bit 81 and is centered.

  Then, the CPU 101 outputs a drive signal to the air cylinder 90 and causes the piston rod 93 to protrude from the cylinder body 92. As a result, the driver bit 81 descends and the screw 10 reaches the game board 11, and the screw 10 passes through the screw hole formed in the accessory and is screwed into the game board 11. Thereafter, when the screw tightening for the game board 11 is completed, the CPU 101 outputs a drive signal to the motor driver circuit and stops the driver units 80a and 80b. Further, the CPU 101 outputs a drive signal to the air cylinder 90 so that the piston rod 93 is immersed in the cylinder body 92.

  In the second step S4-2 shown in FIG. 2, the second pallet carriage 30b moves the upper side of the air cylinder 71 while the screws are tightened on the game board 11 fixed on the first pallet carriage 30a. After passing, the first pallet truck 30a comes into contact with the rear part in the transport direction and stops (see FIG. 14B). In addition, since the drive chain 27 of the pallet truck transport line 24 is always operating, the second pallet truck 30b is transported at a constant speed. Further, when the second pallet carriage 30b passes above the air cylinder 71, the locking member 75 is pushed from the upper position against the urging force of the spring 76 by being pushed by the second pallet carriage 30b. Lower to position. When the second pallet carriage 30 b finishes passing over the piston rod 73, the locking member 75 is raised from the lower position to the upper position by the urging force of the spring 76. In the second step S4-2, the third pallet truck 30c located behind the second pallet truck 30b is positioned above the air cylinder 71 at the rear in the transport direction of the second pallet truck 30b. The contact stops (see FIG. 15A).

  In the subsequent third step S4-3, the CPU 101 outputs a drive signal to the cart lock 51 and the cart stopper 61 when the screw tightening for the game board 11 fixed on the first pallet cart 30a is completed. To do. As a result, the piston rod 54 constituting the bogie lock 51 is immersed in the cylinder body 53, and the engagement between the lock piece 57 and the first engagement portion 59 is released. Further, the stopper plate 63 constituting the carriage stopper 61 is turned by the turning actuator, and the engagement between the pin 68 and the second engaging portion 69 is released. Therefore, the stop of the first pallet truck 30a by the carriage lock 51 and the carriage stopper 61 is released (see FIG. 15A). Then, the discharge of the first pallet truck 30a from the work station A5 (or the work station A10) is started by the drive chain 27 of the pallet truck transport line 24, and at the same time, the first delivery to the work station A5 (work station A10) is started. The entry of the second pallet truck 30b is started.

  In the third step S4-3, the CPU 101 detects that the entry of the second pallet carriage 30b to the work station A5 (or the work station A10) is detected by the carriage detection sensor 28 (that is, the carriage detection sensor 28). When a bogie detection signal is input to the air cylinder 71, a drive signal is output to the air cylinder 71. Thereby, while the piston rod 73 protrudes from the cylinder main body 72, the latching member 75 presses the rear part in the conveyance direction of the 2nd pallet truck 30b (refer FIG.15 (b), FIG.16 (a)). As a result, the first pallet truck 30a and the second pallet truck 30b are accelerated by the air cylinder 71 to a speed higher than a constant speed. Then, the discharge of the first pallet truck 30a from the work station A5 (or work station A10) and the entry of the second pallet truck 30b into the work station A5 (or work station A10) are completed simultaneously.

  After the completion of the third step S4-3, the CPU 101 outputs a drive signal to the carriage lock 51 and the carriage stopper 61. As a result, after the piston rod 54 constituting the carriage lock 51 protrudes from the cylinder body 53, the lock piece 57 engages with the first engagement portion 59 of the second pallet carriage 30b from the rear. Further, after the stopper plate 63 constituting the carriage stopper 61 is turned by the turning actuator, the pin 68 is engaged with the second engagement portion 69 of the second pallet carriage 30b from the front. Therefore, the second pallet cart 30b is stopped by the cart lock 51 and the cart stopper 61, and screw tightening for the game board 11 fixed on the second pallet cart 30b is started.

  Further, the CPU 101 outputs a drive signal to the air cylinder 71, and causes the piston rod 73 to be immersed in the cylinder body 72 (see FIGS. 16 and 17). In this case, the piston rod 73 passes below the third pallet carriage 30c. When the piston rod 73 passes below the third pallet carriage 30c, the locking member 75 descends from the upper position to the lower position against the urging force of the spring 76 (FIG. 16 (b), FIG. 17 (a)). When the piston rod 73 has passed the lower side of the third pallet carriage 30c, the locking member 75 is raised from the lower position to the upper position by the biasing force of the spring 76 (see FIG. 17B).

  After the screw tightening, the game board 11 is removed from the pallet carriage 30 in the vicinity of the end of the line main body 26, and then transferred to the line where the rail press-fitting step S5 is performed by a not-shown transporter or the like.

  Therefore, according to the present embodiment, the following effects can be obtained.

  (1) In the game board production line 21 of the present embodiment, the screw fastening for one game board 11 can be shared by the screw fastening machines 80 provided for each of the work stations A1 to A10. The merit of improvement can be obtained. In addition, the first pallet truck 30a located at the work stations A5 and A10 and the second pallet truck 30b in contact with the rear part in the transport direction of the first pallet truck 30a, Accelerating to a speed faster than a certain speed. Thereby, the discharge time Tb1 for discharging the pallet carriage 30 from the work stations A5 and A10 is shortened. Along with this, the total time of the discharge time Tb1 and the work time Ta1 for fastening the accessory at the work stations A5 and A10 is also shortened. Furthermore, in the present embodiment, the total time (15 seconds) at the work stations A5 and A10 is equal to the total time (15 seconds) at the work stations A1 to A4 and A6 to A9. The work in will flow smoothly. As a result, since the pallet carriage 30 can be smoothly transported in all the work stations A1 to A10, the productivity of the game board 11 is improved without causing the inconvenience that the work in the entire line does not flow smoothly. be able to.

  In the present embodiment, the air cylinder 71 is provided only in the area B1 (or area B2) between the work station A5 (or work station A10) and the work station A4 (or work station A9). When the pallet carriage 30 is accelerated by the air cylinder 71, the friction plate 39 of the pallet carriage 30 and the drive chain 27 of the pallet carriage conveyance line 24 may slide and wear. However, since the pallet carriage 30 is transported at a constant speed without being accelerated in the regions other than the regions B1 and B2, the friction plate 39 and the drive chain 27 do not slide and wear. For this reason, it is possible to suppress the consumption of parts (such as the drive chain 27) in the entire pallet carriage transport line 24.

  (2) In the prior art described in Japanese Patent Application Laid-Open No. 2003-38741, a technique for smoothing the flow of work by allocating a conveyed product to a plurality of work stations arranged in parallel is disclosed. However, if the work stations are simply arranged in parallel, the difference in processing time generated between the work stations cannot be reduced, so that the conveyed product cannot be smoothly conveyed.

  On the other hand, in the present embodiment, the pallet truck 30 is accelerated at specific work stations A5 and A10 that have a longer work time than the work stations A1 to A4 and A6 to A9 in order to fill the difference in processing time. It has become. As a result, the discharge time of the pallet carriage 30 from the work stations A5 and A10 is shortened compared to the case of the work stations A1 to A4 and A6 to A9. Thereby, since the difference of the processing time (total time of work time and discharge | emission time) which arises for every work station A1-A10 can be made small, the pallet truck 30 which is a conveyed product can be conveyed smoothly.

  (3) In the present embodiment, since the size is relatively small, a light accessory (such as the gate 20 or the start opening 16a), that is, an accessory that can be easily removed simply by touching (work stations A1, A2). Since the screws are tightened with the screw, it is possible to prevent the loss of the accessory. If a relatively large accessory (such as the center accessory 15) is screwed at an early stage, it may be caused by vibrations that occur when the pallet carriage 30 is transported or due to poor attachment of the accessory due to bending of the game board 11. When an accessory is removed, the accessory may damage the game board surface 11a. In addition, since a large number of game nails 14 have already been driven into the game board 11 when the accessory is screwed, if the accessory is removed, the accessory may be damaged by the game nail 14.

  (4) In this embodiment, since the screw fastening machine 80 includes “two” driver units 80a and 80b, it is possible to improve the work efficiency of the screw fastening and to reduce the adverse effects at the time of the screw fastening. be able to. If the screw tightening machine 80 has only one driver unit, only one screw 10 can be tightened at a time, so that the screw tightening work efficiency is reduced, and the game board is Productivity will also decline. On the other hand, when the screw fastening machine 80 includes three or more driver units, for example, the following adverse effects occur. In general, the screw fastening machine 80 moves the driver units 80a and 80b based on, for example, numerical data indicating the attachment position of the accessory, but the content of the numerical data is slightly different from the actual attachment position of the accessory. ing. Therefore, before the game board 11 is manufactured, the worker must correct the numerical data by entering the work station and teaching the driver units 80a and 80b. However, if the screw fastening machine 80 is provided with three or more driver units, an empty space in the work station becomes small, and it becomes difficult for an operator to enter the work station and perform teaching.

  (5) In this embodiment, the air cylinder 71 is used as an acceleration means for accelerating the pallet carriage 30. For this reason, when an acceleration means becomes unnecessary, an acceleration means can be easily stopped only by interrupting | blocking air. In this case, since the pallet truck transport line 24 can be used as a normal transport line that transports the pallet truck 30 at a constant speed without accelerating, it suppresses dark parts consumption caused by the pallet truck 30 being accelerated. Can do. Furthermore, since the acceleration means is the air cylinder 71, the acceleration means can be easily installed at a relatively low cost.

  Further, it is conceivable to use an inverter or the like for changing the speed of the pallet truck 30. In this case, it is necessary to stop the pallet truck transport line 24 once. However, in this embodiment, since the air cylinder 71 is used to change the speed of the pallet truck 30, the pallet truck can be adjusted only by adjusting the amount of air that drives the air cylinder 71 without stopping the pallet truck transport line 24. Thirty speed changes can be made.

  In addition, you may change this embodiment as follows.

  In the above embodiment, the two work stations A5 and A10 are used as specific work stations. However, any one of the work stations A5 and A10 may be used as a specific work station. Specifically, the cart lock 51, the cart stopper 61, and the air cylinder 71 may be omitted in any one of the work stations A5 and A10. Further, at least one of the work stations A1 to A4 and A6 to A9 may be used as a specific work station.

  The specific work station is preferably a work station (for example, work station A10) located as close to the end of the pallet carriage transport line 24 as possible. If the specific work station is a work station (for example, work station A1) located on the start end side of the pallet carriage transport line 24, the transport of the pallet truck 30 to the work station located on the end side is delayed. There is a possibility that work on the downstream side of the transport line 24 may be delayed.

  In the above embodiment, the screws are tightened in the order of the gate 20 → the start opening decoration 16a → the grand prize opening decoration 17a → the left side decoration 18 → the right side decoration 19 → the center accessory 15. The order may be arbitrarily changed.

  The pallet carriage transport line 24 of the above embodiment is a line extending in a straight line, and the air cylinder 71 is disposed in the areas B1 and B2 between the work stations A5 and A10 and the work stations A4 and A9. The cart lock 51 and the cart stopper 61 were disposed at the work stations A5 and A10. However, as shown in FIG. 18, the pallet carriage conveyance line 24 is bent so that the upstream conveyance line 24 a and the downstream conveyance line 24 b are bent via a conveyance direction changing unit 111 that changes the conveyance direction of the pallet carriage 30. It may be configured. In addition, since it is necessary to change the conveyance direction of the pallet truck 30 in the conveyance direction change part 111, it exists in the tendency for work time to become long. Therefore, in this case, the air cylinder 71 is disposed, for example, behind the transport direction changing unit 111 in the direction in which the downstream transport line 24b extends, and the cart lock 51 and the cart stopper 61 are disposed in the transport direction changing unit 111, for example. It is preferable to do.

  Next, in addition to the technical ideas described in the claims, the technical ideas grasped by the embodiment described above are listed below.

  (1) The game board production line according to any one of claims 1 to 5, wherein a plurality of nailing stations including a nailing machine for driving game nails into the game board are arranged in series. A plurality of operations provided with a screw driving machine connected to the end of the nail driving line and screwing the accessory against a game board on which the game nail is driven A game board production line comprising: the pallet carriage transport line configured by arranging stations in series.

  (2) In Claim 1, the screw tightening machine is for tightening screws of a plurality of types of articles having different weights, and the closer the work station is located at the start end side of the pallet truck transport line, A game board production line characterized in that a screw tightening machine performs screw tightening of a relatively light accessory among the plurality of types of accessories.

  (3) The game board production line according to claim 3, wherein the attachment positions of the accessory to be screwed by each driver unit are separated from each other.

  (4) In any one of claims 1 to 5, the screw tightening machine includes a driver unit for tightening a screw of an accessory, and the specific work station is one of the plurality of work stations. A game board production line characterized in that it is a work station having the longest moving distance of the driver unit when tightening a screw.

  (5) In a game board production line including a pallet truck transport line for transporting a pallet truck capable of fixing a game board at a constant speed, the pallet truck transport line includes an upstream transport line and a downstream transport for transporting the pallet truck. And a line is configured to bend via a conveyance direction changing unit that changes the conveyance direction of the pallet carriage, and is arranged behind the conveyance direction changing unit in a direction in which the downstream conveyance line extends, and A game board production line comprising acceleration means for accelerating the pallet carriage located in the transport direction changing section to a speed faster than the constant speed.

11 ... Game board 15 ... Center accessory 16a as an accessory ... Start opening ornament 17a as an accessory ... Large prize ornament 18 as an accessory ... Left side ornament 19 as an accessory ... Right side ornament as an accessory 20 ... Gate 21 as an accessory ... Game board production line 24 ... Pallet cart transport line 30 ... Pallet cart 30a ... First pallet cart 30b ... Second pallet cart 30c ... Third pallet cart 71 ... Acceleration means and pressure Cylinder body 73 as an acceleration means body ... Piston rod 74 as a pressing member ... Tip 75 of the pressing member ... Locking member 76 ... Spring 80 as a locking member moving means ... Screw tightening machine 80a, 80b... Driver units A1 to A10... Work stations A1 to A4 and A6 to A9. 10: Specific work station A4, A9 ... Previous work station B1, B2 ... Area Ta1 between the specific work station and the previous work station ... Work time Ta2 at a specific work station ... At another work station Working time Tb1 ... Discharge time of a pallet truck from a specific work station Tb2 ... Discharge time of a pallet truck from another work station

Claims (5)

In a game board production line comprising a pallet truck transport line that transports a pallet truck that can fix a game board at a constant speed,
The pallet truck transport line is
It is configured by arranging in series a plurality of work stations provided with a screw tightening machine for tightening a screw of an accessory to a game board fixed on the pallet carriage,
A first pallet disposed in a region between a specific work station selected from the plurality of work stations and a work station immediately preceding the specific work station, and located at the specific work station; Accelerating means for accelerating the carriage and a second pallet carriage that is in contact with a rear portion in the conveying direction of the first pallet carriage to a speed faster than the constant speed;
The game board
When the first pallet truck is brought into the specific work station, the first pallet truck is stopped by the carriage stop means, and the game board is fixed on the first pallet truck. A first step in which work on
A rear portion of the first pallet cart in the transport direction of the first pallet cart that is located at the specific work station during execution of work on the game board fixed on the first pallet cart. A second step of contacting and stopping,
When the work on the game board fixed on the first pallet truck is completed, the pallet truck transfer line releases the stop of the first pallet truck by the carriage stop means, A third step of starting the entry of the second pallet truck into the specific work station at the same time as the discharge of the first pallet truck from the specific work station is started;
Manufactured through
In the third step, the acceleration means moves the first pallet cart and the second pallet cart into the trigger when the entry of the second pallet cart to the specific work station is detected. Accelerating to a speed faster than a certain speed, and simultaneously completing the discharge of the first pallet truck from the specific work station and the entry of the second pallet truck to the specific work station;
The specific work station has the longest screw tightening work time among the plurality of work stations and the shortest discharge time from the end of the screw tightening until the pallet truck is discharged. Station,
The total time of the work time at the specific work station and the discharge time of the pallet truck from the specific work station is the work time at a work station different from the specific work station and the other work station. A game board production line characterized by being equal to a total time with a discharge time of the pallet truck from The screwing machine is for screwing a plurality of kinds of accessories having different sizes,
The closer the work station is located at the start side of the pallet carriage transport line, the screw tightening machine performs screw tightening of a relatively small size of the plurality of types of accessories. The game board production line according to claim 1.   The game board production line according to claim 1, wherein the screw tightening machine includes a plurality of driver units for performing screw tightening of an accessory.   The accelerating means includes a accelerating means main body and a pressing actuator that protrudes from the accelerating means main body in the same direction as the conveying direction to press the rear portion of the second pallet carriage in the conveying direction. The game board production line according to claim 1, wherein the game board production line is a game board production line. A locking member that can be locked to a rear portion of the second pallet carriage, and a locking member moving unit that moves the locking member in a vertical direction are provided at a tip portion of the pressing member,
The locking member is displaced to an upper position that is locked to the rear portion of the second pallet carriage, and a lower position that is not locked to the rear portion of the second pallet carriage,
In the case where the pressing member is immersed in the acceleration means main body, when the pressing member passes below the third pallet carriage located behind the second pallet carriage, the locking member is The locking member rises from the lower position to the upper position when the pressing member is lowered from the upper position to the lower position and the pressing member has passed the lower side of the third pallet carriage. The game board production line according to claim 4.

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