JPH0461667B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a ball firing device for a pinball game machine such as a pachinko machine that plays a game by firing balls.

[Conventional technology]

The ball firing device in conventional pinball game machines is disclosed in Japanese Patent Application No. 54-46939 ((Japanese Patent Application Laid-open No. 55-138473).
As shown in No. 1, a pivot shaft 12 (also referred to as a handle shaft) to which a hammer arm 7 (also referred to as a batting rod) is fixed to a mounting board 4 is rotatably attached to a mounting board 4 in order to centrally provide a batted ball launcher. At the same time, one end of a mallet arm spring 8 was fixed to the lower end of the mallet arm 7, and a crank 13 for engaging and disengaging a ball hitting cam 17 rotated by a deceleration motor 16 was fixed to one end of a pivot shaft 11.

[Problems to be solved by the invention]

It is recognized that the above-described conventional invention is intended to be compact by concentrating on the mounting board 4, but the other end of the elongated hammer arm spring 8 that imparts elastic force to the hammer arm 8 is attached to the mounting board 4. Therefore, the strength of the spring force by rotating the operating handle must be controlled by the ball hitting force adjusting spring 9, which is interposed between the crank 13 and the rotating gear 25. In other words, the above-mentioned conventional batted ball launcher has a complicated structure and has to adjust the elastic force using two springs, the hammer arm spring 8 and the batted ball force adjustment spring 9. The disadvantage was that the springs needed to be of high quality and precision. The present invention was made to solve this drawback, and its purpose is to provide a ball launcher that can be further downsized, easy to assemble, and can be used stably for a long period of time. It is on offer.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a spring-like resilient biasing member wound around the outer periphery of a bearing cylinder formed on the front surface of a mounting board, and a winding in which one end of the resilient biasing member is formed. At the same time as inserting the mounting member,
Two bearings are press-fitted into both ends of the inner periphery of the bearing cylinder via collars, and the bearing has a angular part and a threaded part continuously formed from a flange part formed at one end toward the end part. In addition, a handle shaft having a square threaded part and a set screw part formed on the end face of the square threaded part is inserted into the other end from the rear side of the mounting board until it abuts the flange part, and the handle shaft is inserted. The angular attachment hole formed at the base of the batting rod is inserted into the angular portion of the handle shaft located on the rear side of the mounting board, and the threaded portion is screwed with a nut. The square threaded part on the front side of the board and protruding outward from the end of the bearing cylinder is screwed with a nut, and the other end of the spring biasing member is covered and locked to the square threaded part. and a square attachment hole formed in the center of the drive cover in which a drive lever that engages and disengages the drive blade rotated by the drive motor is formed, and is screwed into the set screw part with a screw, , an engaging gear that meshes with a gear portion formed on the outer periphery of the winding member, and an engaging gear that can be changed so as to be surface-engaged with the engaging gear at any position, and that rotates in conjunction with the rotating operation of the operating handle. The present invention is characterized in that a biasing force adjustment mechanism including a transmission member capable of transmitting the power is provided on the front side of the mounting board.

[Effect]

Insert the handle shaft into the two bearings that are press-fitted into both ends of the inner circumference of the bearing sleeve from the rear of the mounting board until the flanges abut, and then tighten the square threaded part protruding outward from the end of the bearing sleeve with the nut. By screwing it in, the handle shaft can be easily assembled into the bearing sleeve. In addition, during assembly, a collar is interposed between the bearings, so even if the nut is tightened somewhat strongly, there will be no difference in level between the inner and outer rings of the bearing, which allows the bearing to move smoothly. Ensures rotation. In addition, for the handle shaft assembled as described above, fit the square attachment hole formed at the base of the batting rod into the corner located on the rear side of the mounting board, and tighten the threaded part with a nut. On the other hand, the other end of the resilient biasing member is coated and locked to the square threaded part on the front side of the mounting board that protrudes outward from the end of the bearing sleeve, and is rotated by the drive motor. By inserting the square attachment hole formed in the center of the drive cover, which forms a drive lever that engages and disengages the drive blade, and screwing it into the set screw part, the batting rod and The drive cover remains assembled in a predetermined position without shifting, and the spring biasing member also remains attached to the outer periphery of the bearing cylinder by the drive cover, so it can be used for a long period of time. As a result, a stable ball firing operation can be obtained. In addition, since the resilient biasing member in the form of a coiled spring and the winding member in which one end of the resilient biasing member is formed are inserted through the outer periphery of the bearing cylinder formed on the front surface of the mounting board, It can be made more compact compared to the case where a long biasing member is used. Further, as described above, the winding member inserted through the bearing cylinder is rotated in conjunction with the rotation of the operating handle, and the engaging gear of the biasing force adjustment mechanism rotates the winding member in the shape of a wound spring. Since the elastic force can be adjusted simply by changing the winding direction of the member, there is no need to prepare a spring biasing member with high precision in terms of elasticity coefficient, dimensions, etc. Further, the engaging gear that meshes with the gear portion formed on the outer periphery of the winding member can be changed so that it can be surface-engaged with the engaging gear at any position, and can be changed in conjunction with the rotating operation of the operating handle. Since a biasing force adjustment mechanism consisting of a rotatable transmission member is provided on the front side of the mounting board, it is possible to easily adjust the elastic force in the initial state by changing the position where the engaging gear and the transmission member engage. Power can be adjusted.

【Example】

One embodiment of the present invention will be described below based on the drawings. 1 to 6 show a ball launcher 1 including a biasing force adjustment mechanism A, FIG. 1 is a perspective view of the ball launcher, FIG. 2 is an exploded perspective view of the device, and FIG. 3 is a perspective view of the ball launcher. 4 is a front view of the device, FIG. 5 a is a sectional view of biasing force adjustment mechanism A, b is a back view of mechanism A, and FIG. 2 is a perspective view showing the relationship between the batted ball firing device 1 and the operating handle device 65. FIG. In the figure (the explanation will focus on Figure 2 in particular),
A bearing sleeve 3 and positioning pins 4a and 4b are formed diagonally on the front side of the substantially square mounting board 2 (hereinafter referred to as the front side of the board, and the opposite side is referred to as the rear side of the board), and on the mounting board 2 itself. A large circular hole 5, a mounting hole 6, through holes 7a to 7c, and a large number of screw holes are provided therethrough. There are two bearings 8 at both ends inside the bearing tube 3.
a and 8b are press-fitted through the collar 9. A cylindrical handle shaft 10 is fitted into the inner diameter of the bearings 8a, 8b from the rear side of the substrate, and the handle shaft 10 has a flange portion 1 formed on one end thereof.
The bearings 8a, 8b and the collar 9 are held by two nuts 16a, 16b which are screwed into the square threaded part 12 formed at the other end of the bearing 8a, 8b, and the collar 9 is rotatably supported. be done. In this way, in this embodiment, since the collar 9 is interposed between the bearings 8a and 8b, the nuts 16a,
Even if 16b is tightened somewhat strongly, bearing 8a,
There is no difference in level between the inner circumferential ring and the outer circumferential ring of bearing 8b, thereby ensuring smooth rotation of bearings 8a and 8b. Further outside the flange portion 11 of the handle shaft 10, an angular threaded portion 13 and a circular threaded portion 14 are formed. Further, a set screw hole 15 is formed in the end surface of the threaded portion 12. On the outer periphery of the bearing tube 3, a coil spring 1 is installed as a spring biasing member.
7 is penetrated therethrough, and a winding gear 20 as a winding member is rotatably loosely fitted to the base thereof. A locking groove 22 for locking one end 18 of the coil spring 17 is formed in the flange portion 21 of the winding gear 20 . On the other hand, the other end 19 of the coil spring 17 is inserted and fixed into a locking hole 25 formed in a drive cover 23 made of resin. A square attachment hole 24 is provided through the center of the drive cover 23.
4, the square threaded portion 12 of the handle shaft 10 is inserted into the set screw hole 15 with the screw 28, and the drive cover 23 is attached to the handle shaft 1.
Fixed to 0. Further, a drive lever 26 is integrally formed on the drive cover 23, and a rotary roller 27 is rotatably attached to the tip of the drive lever 26 so as to face the mounting board 2. On the other hand, a mounting hole 30 drilled at the base of the ball hitting rod 29 having a wall thickness slightly thicker than the length of the threaded part 13 is fitted into the threaded part 13 of the handle shaft 10 that protrudes toward the rear surface of the board. , screw the threaded portion 14 with the washer 31 and nut 32 to connect the batting rod 29 to the handle shaft 1.
It is fixed at 0. Therefore, this batting rod 29, the drive cover 23, and the drive lever 26 constitute a handle shaft system member that integrally rotates around the handle shaft 10. Further, on the tip of the ball rod 29, there is a hammer tip spring 33 that directly fires the ball, and on the approximately central side surface of the ball rod 29, there is a linkage lever 3 that engages with a ball feed lever (not shown) that sends the ball to the firing position.
4 are attached to each other. In addition, the batting rod 29
An upper locking rubber 35 and a lower locking rubber 37 for locking are respectively fixed to the rear surface side of the mounting board 2 via rubber fastening plates 36 and 38 whose mounting positions are adjustable. In this way, in this embodiment, the ball striking rod 29 and the drive cover 23 are maintained in a predetermined position assembled with respect to the handle shaft 10 without shifting, and the coil spring 17 is also attached to the drive cover 23. Since the ball remains disposed around the outer periphery of the bearing tube 3, stable ball firing operation can be achieved over a long period of time. Further, as described above, the winding gear 20 penetrated through the bearing sleeve 3 is formed into a winding spring shape by an engagement gear 44 of a biasing force adjustment mechanism A to be described later, which rotates in conjunction with the rotation operation of the operating handle 65. Since the elastic force can be adjusted simply by changing the winding direction of the coil spring 17, there is no need to prepare a coil spring 17 with high precision in terms of elastic coefficient and dimensions. A drive motor 39 is temporarily fixed to the large circular hole 5 formed on the right side of the bearing sleeve 3 from the rear side of the substrate, and a drive blade 41 fixed to a rotary drive shaft 40 of the drive motor 39 is inserted through the large circular hole 5 formed on the right side of the bearing tube 3 in the figure. The blade 41 and the rotary roller 27 of the drive lever 26 can be freely engaged and disengaged by the rotation of the drive motor 39, and when the drive lever 26 is pulled, the batting rod 29 is moved at a certain angle. Make it sway. A biasing force adjustment mechanism A is attached to the attachment hole 6 located above the large circular hole 5. This biasing force adjustment mechanism A mainly includes a first control member A1 that meshes with the winding gear 20, and a second control member A2 that can mesh with the first control member A1 at any position.
It is composed of. More specifically, the first control member A1 is inserted into an engagement gear 24 having a tooth profile on its outer periphery and a square hole 43 formed through a boss portion 44 at the center of the rear surface of the engagement gear 42. The short locking angle tube 45 has a locking tooth profile 46 and a circular guide tube 47 formed rearward on the head thereof, and a circular guide tube 47 is formed on the rear end surface of the short locking angle tube 45. As shown in FIG. 5b, a +-shaped driver groove 48 is formed. Note that when the short square locking tube 45 is inserted into the square hole 43 and a screwdriver is inserted into the driver groove 48 of the short locking angle tube 45 to rotate the short square tube 45, the engagement gear 42 is also rotated. It rotates. On the other hand, the second control member A2
and an engagement cover 53 that covers the rear surface. The transmission link cylinder 49 is formed of a stepped hollow cylinder and has an engaging protrusion 50 on the front side, a regulating protrusion 51 on the lower side of the protrusion 50, and a protrusion described later on the rear side. The grooves 52 each having a width approximately the same as the width of the groove 58 are formed. Further, the engagement cover 53 is formed in a donut disk shape, and has a locking tooth profile 54 that meshes with the locking tooth profile 46 on the inner circumference on the front side thereof, and a mounting hole for fixing to the transmission link cylinder 49 on the outer periphery thereof. 55 are formed. In order to fix the transmission link cylinder 49 and the engagement cover 53, the short locking angle cylinder 45 is attached to the engagement cover 53.
After inserting the retaining ring 57 having a protrusion 58 into the guide tube 47 of the short locking angle tube 45 and inserting the retaining ring 57 into the inner circle of the retaining angle tube 45, and further installing a coil spring 59 for pressing inside,
The engagement cover 53 is fixed to the transmission link cylinder 49 with screws 56 so that the protrusion 58 is inside the groove 52 of the transmission link cylinder 49. The first control member A1 and the second control member A1 configured in this way
In the control member A2, the boss portion 44 of the engagement gear 42 of the first control member A1 is inserted into the mounting hole 6 via the guide ring 60, and the locking angle short tube 45 is inserted into the square hole 43.
and insert the engagement cover 53 into the transmission link cylinder 4.
After overlapping the items fixed to 9, fixing plate 61
It is clamped and fixed to the mounting board 2 with screws. The fixing plate 61 is formed into a cylindrical shape, and has a hole 62 penetrated through the center of its upper side so that the engagement protrusion 50 of the transmission link cylinder 49 protrudes, and the retaining ring is attached to the outer periphery of the hole 62. A locking cutout groove 63 having the same width as the projection 58 into which the projection 58 of No. 57 appears and a rotation restriction groove 64 that restricts the rotation range of the entire biasing force adjustment mechanism A by entering the restriction projection 51 is formed. It is formed. Note that when the first control member A1 and the second control member A2 are fixed to the mounting board 2 by the fixing plate 61, the engagement gear 42 and the winding gear 20 are positioned in mesh with each other. The rotational action of the urging force adjustment mechanism A is transmitted to the take-up gear 20, so that the tension of the coil spring 17 can be adjusted. In addition, in order to relatively change the engagement position between the first control member A1 and the second control member A2, insert a screwdriver into the driver groove 48 of the short locking angle tube 45 of the first control member A1 to adjust the locking angle. When the short tube 45 is pressed against the bias of the coil spring 59, the first control member A
When the engagement between the locking tooth profile 46 on the first side and the locking tooth profile 54 on the second control member A2 is released and the first control member A1 is in a freely rotatable state and the driver is rotated, the first control member A1 is rotated. It can rotate, and the rotational movement is transmitted to the take-up gear 20 as described above, so that the tension of the coil spring 17 can be adjusted. At this time, the protrusion 58 of the retaining ring 57
Because it has penetrated into the locking notch groove 63 of No. 1,
The control member A2 cannot rotate relative to the fixed plate 61, that is, it is in a fixed state. (See Figure 5a). After the predetermined position adjustment is completed, the coil spring 5 is released by loosening the pressure of the screwdriver.
Due to the urging force of 9, the locking tooth profile 46 and the locking tooth profile 5
4 engages with each other, and furthermore, the protrusion 58 engages with the locking notch groove 63.
The first control member A1 and the second control member A2 are in a state in which they can rotate together as a unit since the first control member A1 and the second control member A2 are moved back from the groove 52 and are inside the groove 52 (see FIG. 3). The ball launcher 1 configured as described above is associated with an operating handle device 65 as shown in FIG. That is, the operating handle device 65 includes an operating handle cover body 66 provided with an operating handle 67 that can be operated by a player.
is connected to the transmission rotating plate 70 by a cable 69 via a plurality of pulleys 68 (some of which are not shown). The transmission rotary plate 70 includes the second control member A2.
A matching hole 71 is formed into which the engaging protrusion 50 enters and engages, and this engagement transmits the rotational movement of the operating handle by the player to the batted ball firing device 1 side. In addition, a ball launcher 1 and an operation handle device 6 are also provided.
5 applied to the pinball game machine 72 will be explained based on FIGS. 7 to 9. FIG. 7 is a front view of the pinball game machine, FIG. 8 is a back view of the same game machine,
FIG. 9 is an exploded perspective view showing the relationship between the front frame, the ball launcher, the lower plate, and the operating handle device. In FIG. 7, a metal frame 74 is provided around the inner periphery of a front frame 73 formed in the shape of a frame of a pinball game machine 72, and a glass door frame 75 and a front plate 77 are attached to the metal frame 74. It is pivoted so that it can be opened and closed. glass door frame 75
The game board 76 covered by is provided with various winning devices. Further, the front plate 77 covers a firing rail portion (not shown), and an upper tray 78 is fixed to the front surface of the plate 77 for storing prize balls ejected by safe balls entered in the prize entry device. The lower front frame 73 of the front plate 77 is provided with a lower tray 79 on the left side in the figure for storing surplus prize balls when the upper tray 78 is full, and a lower tray 79 on the right side in the figure for adjusting the batting force. The operating handle 67 is provided. In addition, in FIG. 8, a mechanism plate 80 covering the back surface of the game board 76 includes various mechanisms for controlling the winning safe balls of the winning device and ejecting a predetermined fixed number of prize balls. A mechanical device is formed, and the front frame 73 at the lower left in the figure
A batted ball launching device 1 is fixed to the back surface of the ball in correspondence with the operating handle device 65. In addition, 81 in the figure is an outer frame of the pinball game machine 72 that pivotally supports the front frame 73 so as to be freely openable and closable. Furthermore, in FIG. 9, a window 82 is opened in the lower part of the front frame 73, and the mounting board 2 of the batted ball launcher 1 is attached to cover the window 82 from the back side of the front frame 73. A winding gear 20 and a coil spring 1 protrude toward the front side of the board in the space of
7, a drive cover 23, a drive blade 41, a biasing force adjuster A, etc. are located therein. Note that when attaching the mounting board 2 to the front frame 73, the positioning pins 4a, sb
The guide holes 83a, 83 provided through the front frame 73
Just insert it into b. On the other hand, the operation handle cover body 66 covers the front side of the window 82. Operation handle cover body 66
is integrated with the ball launcher 1 by inserting the mounting screw grooves 84a to 84c into the mounting holes 85a to 85c provided through the front frame 73 and the through holes 7a to 7c of the mounting board 2 and screwing them. is fixed to the front frame 73. Moreover, on the left side of the operation handle cover body 66,
A tray frame body 86 forming a lower tray 79 and an ashtray is fixed to the front frame 73 together with a decorative cover body 87.
That is, the plate frame body 86 has mounting threaded rods 88a to 88a.
88c is provided protrudingly, passes through the through holes 89a to 89c of the decorative cover body 87, and further extends through the front frame 7.
The plate frame body 86 and the decorative cover body 87 are fixed to the front frame 73 by being screwed through the attachment holes 90a to 90c provided through the frame member 3. At a position corresponding to the lower tray 79, an opening 91 is formed in the decorative cover body 87 and a prize ball outlet 92 is formed in the front frame 73, so that the prize balls can be guided to the lower tray 79. Furthermore, a speaker 93 that emits various sounds is attached to the left back side of the front frame 73.
Escape holes 94 and 95 are formed in the decorative cover body 87 and the front frame 73, respectively, so that sound can be transmitted forward. To explain the operation of the batted ball firing device 1 of the embodiment having the above configuration, the batting force adjustment in a normal game is performed when the player rotates the operation handle 67 located on the front of the pinball game machine 72 (9th
(rotate in the direction of the arrow in the figure), the movement is transmitted by the rotating plate 7
The force is transmitted to the biasing force adjustment mechanism A that engages with 0, causing the rotatable device A to rotate, and further rotating the winding gear 20 that meshes with the device A (arrow in Fig. 4). The elastic force of the ball can be adjusted by increasing the tension of the coil spring 17. On the other hand, when adjusting the hitting force during the manufacture of the pinball game machine, or when adjusting the so-called initial tension when the coil spring 17 is stretched due to long-term use in a game parlor, the pinball game machine Insert the screwdriver from the back side of 72 and insert it into the driver groove 48.
When the first control member A1 is pressed and rotated by a desired angle, only the first control member A1 rotates by a corresponding angle, and the take-up gear 20 that meshes with this rotates, changing the tension of the coil spring 17 in the state before the rotation operation of the operating handle 67. You can force it. At this time, since the second control member A2 is locked to the fixed plate 61, the position relative to the first control member A1 can be reliably changed.

【Effect of the invention】

As explained above, in the present invention, the handle shaft is inserted from the rear of the mounting board into the two bearings that are press-fitted into both ends of the inner periphery of the bearing sleeve until the flange portions come into contact with each other, and the end of the bearing sleeve is The handle shaft can be easily assembled to the bearing cylinder by screwing the square threaded portion protruding outward from the shaft with a nut. In addition, during assembly, a collar is interposed between the bearings, so even if the nut is tightened somewhat strongly, there will be no difference in level between the inner and outer rings of the bearing, which allows the bearing to rotate smoothly. is ensured. In addition, for the handle shaft assembled as described above, fit the square attachment hole formed at the base of the batting rod into the corner located on the rear side of the mounting board, and tighten the threaded part with a nut. On the other hand, the other end of the resilient biasing member is coated and locked to the square threaded part on the front side of the mounting board that protrudes outward from the end of the bearing sleeve, and is rotated by the drive motor. By inserting the square attachment hole formed in the center of the drive cover, which forms a drive lever that engages and disengages the drive blade, and screwing it into the set screw part, the batting rod and The drive cover remains assembled in a predetermined position without shifting, and the spring biasing member also remains attached to the outer periphery of the bearing cylinder by the drive cover, so it can be used for a long period of time. As a result, a stable ball firing operation can be obtained. In addition, since the resilient biasing member in the form of a coiled spring and the winding member in which one end of the resilient biasing member is formed are inserted through the outer periphery of the bearing cylinder formed on the front surface of the mounting board, It can be made more compact compared to the case where a long biasing member is used. Further, as described above, the winding member inserted through the bearing cylinder is rotated in conjunction with the rotation of the operating handle, and the engaging gear of the biasing force adjustment mechanism rotates the winding member in the shape of a wound spring. Since the elastic force can be adjusted simply by changing the winding direction of the member, there is no need to prepare a spring biasing member with high precision in terms of elasticity coefficient, dimensions, etc. Further, the engaging gear that meshes with the gear portion formed on the outer periphery of the winding member can be changed so that it can be surface-engaged with the engaging gear at any position, and can be changed in conjunction with the rotating operation of the operating handle. Since a biasing force adjustment mechanism consisting of a rotatable transmission member is provided on the front side of the mounting board, it is possible to easily adjust the elastic force in the initial state by changing the position where the engaging gear and the transmission member engage. Power can be adjusted.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the ball launcher, Fig. 2 is an exploded perspective view of the device, Fig. 3 is a schematic cross-sectional view of the main parts of the device, Fig. 4 is a front view of the device, and Fig. 5a is 7 is a front view of the pinball game machine; FIG. 8 is a cross-sectional view of the biasing force adjustment mechanism; b is a back view of the same mechanism; 9 is a rear view of the same gaming machine, and FIG. 9 is an exploded perspective view showing the relationship between the front frame, the batted ball firing device, the lower tray, and the operating handle device. 1... Batted ball launcher, 2... Mounting board, 3...
Bearing tube, 8a, 8b... Bearing, 9... Collar, 10... Handle shaft, 11... Flange part,
12... Square screw part 13... Square part, 14... Threaded part, 15... Set screw hole, 16a, 16b...
Nut, 17...Coil spring (biasing member),
20... Winding gear (winding member), 23... Drive cover, 26... Drive lever, 28... Screw, 29
... Batting rod, 39 ... Drive motor, 42 ... Engagement gear, 49 ... Transmission link cylinder, 57 ... Stop ring (fixing means), 67 ... Operation handle, 72 ...
...Pinball game machine, A...Biasing force adjustment mechanism, A1...
First control member, A2... second control member.

Claims (1)

[Scope of Claims] 1. A spring-like resilient biasing member wound around the outer periphery of a bearing cylinder formed on the front surface of the mounting board and a winding member in which one end of the resilient biasing member is formed. At the same time, two bearings are press-fitted into both ends of the inner periphery of the bearing cylinder via collars, and a corner part and a screw are continuously formed from the flange part formed at one end to the end part. Insert a handle shaft having a square threaded part at the other end and a set screw part formed on the end face of the square threaded part from the rear side of the mounting board until it abuts the flange part. and inserting the angular attachment hole formed at the base of the batting rod into the angular portion of the inserted handle shaft located on the rear side of the mounting board, and screwing the threaded portion with a nut; On the other hand, the square threaded part on the front side of the mounting board that protrudes outward from the end of the bearing tube is screwed with a nut, and the spring biasing member and other parts are screwed onto the square threaded part. The end of the drive cover is coated and locked, and the drive cover is formed with a drive lever that engages and disengages the drive blade rotated by the drive motor.Insert the square attachment hole formed in the center of the drive cover, and screw the screw into the set screw part. and an engaging gear that meshes with a gear portion formed on the outer periphery of the winding member, which can be changed so as to be able to engage face-to-face with the engaging gear at any position, and can be rotated by an operating handle. A ball firing device for a pinball game machine, characterized in that a biasing force adjustment mechanism comprising a transmission member that can rotate in conjunction with the mounting board is provided on the front side of the mounting board.