Gripping arm

Abstract

To provide a gripping arm that can reduce work load by facilitating replacement of a pawl member.SOLUTION: A fixing member 2104 includes: a shaft 2104a that can guide a pawl member 203a to a prescribed position while being guided by a guide groove 2201 of the pawl member 203a; a pressing part 2104b which is provided at a tip on a fitting side of the pawl member 203a of an arm body part 203b on the shaft 2104a, and presses the pawl member 203a against the arm body part 203b with the pawl member 203a fit at a prescribed position; a detachment prevention member 2104c that is provided on an opposite side of the pawl member 203a to the fitting side of the arm body part 203b, and prevents detachment of the shaft 2104a from a shaft hole; and a spring for energizing the pressing part 2104b in a direction in which the pressing part 2104b presses against the arm body part 203b.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a gripping arm. [Background technology]

[0002] A prize-capturing game device, such as a crane game machine, is used by placing a large number of prizes in a play field formed inside a housing. A player can move a prize-capturing device having a gripping arm within the play field by using an operating means such as a lever or button. After moving the prize-capturing device to the position where a desired prize is placed, the player can grab the prize with the gripping arm and lift it up to the prize outlet in that state to acquire the prize.

[0003] A claw member is removably attached to the tip of the gripping arm of the prize capture device used in this type of prize capture game device, so that the operator can select and use an appropriate form of claw member depending on the type of prize placed in the playfield. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2022-097611 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the gripping arm described in Patent Document 1 has a configuration in which the claw members are attached to the gripping arm by screws, which makes the task of replacing the claw members burdensome. In addition, when the screws are loosened, the claw members may fall off and may be lost.

[0006] The present invention has been made in consideration of the above problems, and has an object to provide a gripping arm that can reduce the workload by simplifying the replacement work of the claw members. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides a gripping arm having an arm body and a claw member detachable from a tip end of the arm body, the gripping arm being attached to a prize-capturing device and used to grip a prize, The claw member has a guide groove at a base end portion and an insertion hole communicating with the guide groove, a shaft hole is provided at a tip end of the arm body at a position that aligns with the insertion hole when the claw member is attached to a predetermined position, and a fixing member is provided to be inserted into the shaft hole; The fixing member is characterized in that it comprises an axis portion capable of guiding the claw member to the predetermined position while being guided by the guide groove of the claw member, a pressing portion provided at the tip of the axis portion on the attachment side of the claw member of the arm main body portion for pressing the claw member against the arm main body portion with the claw member attached to the predetermined position, a slip-out prevention portion provided on the side of the arm main body portion opposite the attachment side of the claw member for preventing the axis portion from slipping out of the axis hole, and a biasing means for biasing the pressing portion in the direction of pressing against the arm main body portion.

[0008] The invention described in claim 2 is the gripping arm described in claim 1, The arm is characterized in that it is provided with a holding member that can be displaced between a first state in which the fixing member is movable and a second state in which the fixing member is held in a state in which the pressing portion presses the claw member against the arm main body portion.

[0009] The invention described in claim 3 is the gripping arm described in claim 2, the holding member is provided on an opposite side of the arm body portion to an attachment side of the claw member, the holding member being slidable between a first position and a second position in a direction intersecting an axial direction of the fixing member, The present invention is characterized in that, when the retaining member is in the first position, the retaining member is in a state where it does not interfere with the axial movement of the fixing member, thereby achieving the first state, and, when the retaining member is in the second position, the retaining member is in the second state, thereby restricting the axial movement of the fixing member.

[0010] The invention described in claim 4 is the gripping arm described in claim 3, The present invention is characterized in that it has an engaging protrusion that advances near the rear end of the holding member in the sliding direction of the holding member when the holding member is in the second position, and is configured to be retractable by applying a predetermined pressing force to slide the holding member in the second position to the first position.

[0011] The invention described in claim 5 is a gripping arm according to any one of claims 1 to 4, The fixing member is characterized by comprising a restricting means for restricting the movable range of the fixing member. Effect of the Invention

[0012] According to the present invention, a gripping arm can be provided that can reduce the workload by simplifying the replacement work of the claw members. [Brief description of the drawings]

[0013] [Figure 1] 1 is a perspective view showing the appearance of a crane game machine according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a gripping arm that can be attached to the gripping device shown in FIG. 1, where (A) is a right side view thereof, and (B) is a plan view thereof. [Diagram 3] FIG. 2 is a front view of a gripping arm that can be attached to the gripping device shown in FIG. 1, and FIG. [Figure 4] FIG. 2 is a gripping arm that can be attached to the gripping device shown in FIG. 1, in which (A) is a bottom view and (B) is a perspective view. [Diagram 5] 4 is a cross-sectional view taken along line AA in FIG. [Figure 6] BB cross-sectional view shown in FIG. [Figure 7] 13 is a partially enlarged side sectional view illustrating a procedure for removing the claw member from the arm body. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, a prize acquisition game device (e.g., a crane game machine) according to an embodiment of the present invention will be described with reference to the drawings. However, the scope of the invention is not limited to the illustrated examples. In the following description, parts having the same functions and configurations are given the same reference numerals and their description will be omitted.

[0015] First, the overall configuration of a crane game machine 100 as an example of a prize acquisition game device that can be applied to the present invention will be described with reference to Fig. 1. In the description of Fig. 1, left and right, front and rear, and up and down refer to left and right, front and rear, and up and down based on the state in which a player of the crane game machine 100 sees it from the front side.

[0016] The crane game machine 100 is formed, for example, in a vertically long rectangular parallelepiped shape, and an appropriate number of casters C are attached to the bottom surface. Therefore, the crane game machine 100 can be easily transported by pushing it by staff at an amusement facility such as a game center.

[0017] The crane game machine 100 includes a box-shaped base 1, a play field 2 formed above the base 1, and a ceiling portion 3 covering the play field 2 from above.

[0018] The base 1 houses, for example, a control board having a control unit that performs overall control of the crane game machine 100, and the inside can be accessed by opening an opening / closing door 1a provided on the right side of the front of the base 1. In addition, a money collection door 1b is provided at the bottom center of the front of the base 1 so as to be able to be opened and closed, for collecting coins and coins accepted by coin selectors 84a and 84b (described later).

[0019] The play field 2 has a bottom 2a on which many prizes P are placed, and an internal space is formed by a front plate 2b, a left side plate 2c, a right side plate 2d, a back plate 2e, and the above-mentioned ceiling part 3. The front plate 2b, the left side plate 2c, and the right side plate 2d are made of plate-like members made of transparent glass or resin, so that the internal space can be seen. The front plate 2b is made of, for example, a sliding door, and the inside of the play field 2 can be accessed by opening the sliding door.

[0020] A prize outlet 4 with a square opening is provided at the left front corner of the bottom 2a of the play field 2, and the prize P can be discharged downward. The prize P discharged from the prize outlet 4 falls to the prize removal chamber 6, and the prize P in the prize removal chamber 6 can be removed by opening a door body 7 provided on the left side of the front of the base 1. Here, the door body 7 is made of a plate-like member made of transparent glass or resin, and the inside can be seen through the door body 7. In addition, a partition plate 5 is erected on the bottom 2a so as to surround the right end and rear end of the prize outlet 4, and prevents the prize P placed or piled up on the bottom 2a from falling from the prize outlet 4.

[0021] Above the playfield 2, a gripping device 200 that functions as a prize capturing device is provided, and is suspended by a fixed rod 200a and an extendable rod 200b. Although not shown, two longitudinal rails are provided in parallel on the ceiling 3, extending in the front-rear direction near both the left and right ends, and one lateral rail is installed on the two longitudinal rails. The lateral rails are configured to be movable along the extension direction of the longitudinal rails by a longitudinal motor. A telescopic device that can extend and retract the telescopic rod 200b relative to the fixed rod 200a is provided on the lateral rail so as to be movable left and right along the extension direction of the lateral rail by the lateral motor. In addition, the telescopic device can displace the gripping device 200 attached to the tip of the telescopic rod 200b in the up and down direction by performing the telescopic operation of the telescopic rod 200b.

[0022] The gripping device 200 is configured to include a main body 200A to which an extendable rod 200b is attached, and one or more gripping arms 203 supported by the main body 200A. The gripping arms 203 are attached so as to be openable and closable by an actuator such as a motor provided on the main body 200A, and are capable of gripping the prize P. The specific configuration of the gripping arms 203 will be described later.

[0023] On the other hand, the operation unit 8 is provided in the center of the front surface of the base 1 and has a box-like shape. An operation lever 81, an operation button 82, and a display unit 83 are arranged on the upper surface of the operation unit 8. The operation lever 81 and the operation button 82 can be operated by the player, and the display unit 83 displays, for example, the remaining number of times that can be played and the remaining time for playing. The player can move the gripping device 200 to any position in the play field 2 by operating the operation lever 81, and can lower the gripping device 200 and perform a gripping operation by operating the operation button 82. When the gripping operation is completed, the gripping device 200 rises and moves above the prize discharge port 4 while maintaining the gripping arm 203 in a closed state, changing the gripping arm 203 to an open state. At this time, if the prize P is held by the holding device 200, the prize P falls toward the prize discharge outlet 4 and is guided to the prize removal chamber 6, so that the player can remove the prize P from the prize removal chamber 6.

[0024] In addition, two coin selectors 84a and 84b are arranged side by side on the front of the operation unit 8, and each of them can accept different types of coins and medals. In this embodiment, for example, the coin selector 84a is configured to be able to accept only 100 yen coins, and the coin selector 84b is configured to be able to accept only 500 yen coins, but this is not limited to this. The coins and medals accepted by the coin selectors 84a and 84b are collected in a collection box at the bottom of the base 1, for example, and can be collected by the manager of the amusement facility unlocking and opening the collection door 1b. In addition, the front of the operation unit 8 is configured to be openable and closable, and for example, the manager of the amusement facility unlocks and opens the front of the operation unit 8, so that maintenance of the operation unit 8 can be performed. In addition, instead of the coin selectors 84a, 84b, or in addition to the coin selectors 84a, 84b, a reader / writer device capable of reading payment information from an IC card or a two-dimensional code may be provided, and credit may be accepted based on the payment information read by the reader / writer device.

[0025] Next, the configuration of the gripping arm 203 provided in the gripping device 200 will be described with reference to Fig. 2 to Fig. 6. In the description from Fig. 2 onwards, up and down, left and right, center side, and outside mean up and down, left and right, center side, and outside with respect to the state seen from the central axis of the gripping device 200.

[0026] 2 to 6, the gripping arm 203 is configured to include an arm body 203b formed in a substantially L-shape in side view, and a metal claw member 203a bent into a substantially L-shape and detachably attached to the tip of the arm body 203b. An arm attachment portion 203c for attachment to the gripping device 200 is formed at the base end of the arm body 203b, and by attaching the arm attachment portion 203c to the gripping device 200, the gripping arm 203 opens and closes when driven by the gripping device 200, so that the prize P can be gripped.

[0027] As shown in FIG. 3A, a step is provided at the bottom of the central side surface (the side surface on which the claw member 203a is attached) of the arm body 203b, and a claw mounting portion 2101 to which the claw member 203a can be attached is formed. The height dimension of this step is approximately the same as the thickness of the claw member 203a. In addition, a positioning protrusion 2102 is integrally formed so as to protrude downward from the central upper end of the claw mounting portion 2101 at the center of the step portion of the arm body 203b, and fits into a guide groove 2201 of the claw member 203a described later, functioning as a positioning means for the claw member 203a. In addition, a cylindrical positioning boss 2103 is provided slightly below the center of the claw mounting portion 2101 and protrudes toward the center side. The positioning boss 2103 fits into a positioning hole 2203 of the claw member 203a described later, and functions as a positioning means for the claw member 203a together with the positioning protrusion 2102. The shapes of the positioning protrusion 2102 and the positioning boss 2103 are not limited to those described above, and any appropriate shape may be adopted.

[0028] Further, an axial hole 2112 (see FIG. 5) is opened below the positioning protrusion 2102, and an axial portion 2104a of the fixing member 2104 shown in FIG. 3(B) is inserted through the axial hole 2112. The fixing member 2104 has a flat screw head-shaped pressing portion 2104b integrally provided with the axial portion 2104a at the end of the center side (attachment side of the claw member 203a) of the gripping arm 203, and a nut-shaped retaining member 2104c attached to the outer end. The diameters of the pressing portion 2104b and the retaining member 2104c are each larger than the axial hole 2112, and have a function of preventing the fixing member 2104 from coming off. The fixing member 2104 is not limited to the above-mentioned configuration, and any configuration having the axial portion 2104a that can be inserted into the axial hole 2112 and having a function of preventing the fixing member 2104 from coming off the axial hole 2112 can be used.

[0029] The fixed member 2104 is provided with a U-shaped restricting member 2105, which is inserted through the shaft portion 2104a adjacent to the retaining member 2104b, and restricts the movable range of the shaft portion 2104a. That is, it can be said that the restricting member 2105 has a function of restricting the amount of protrusion of the pressing portion 2104b toward the center side. In addition, a spring 2104d, which functions as an elastic member, is wound around the shaft portion 2104a between the arm main body 203b and the retaining member 2104c, and is provided so as to bias the shaft portion 2104a in a direction in which the pressing portion 2104b presses against the arm main body 203b (i.e., the claw mounting portion 2101).

[0030] Since the fixing member 2104 is configured as described above, by pressing the retaining member 2104c, the shaft portion 2104a can be displaced against the biasing force of the spring 2104d up to the position where the restricting member 2105 abuts against the arm main body portion 203b. As a result, the pressing portion 2104b protrudes, and the pressing force against the claw member 203a attached to the arm main body portion 203b can be released.

[0031] 5, a housing 203d hollowed out in a U-shape in cross section is formed on the outer side of the arm main body 203b (the side opposite to the mounting side of the claw member 203a), and the other end of the fixed member 2104 is disposed inside this housing 203d. Guide grooves 2105a for guiding the movement of the regulating member 2105 are formed on both side walls of the housing 203d, and as shown in FIG. 3(B), a guide portion 2108 for guiding a slider 2106 (described later) is provided inwardly above the position where the fixed member 2104 is disposed.

[0032] Moreover, a slider 2106 is disposed above the fixed member 2104, and by operating a lever portion 2107 protruding from the vicinity of the upper end, the slider 2106 can be slid up and down while being guided by a guide portion 2108. The slider 2106 has a notch portion 2109 cut out in a rectangular shape at the approximately lower center, and both sides are configured as legs 2110. When the slider 2106 is slid downward, the notch portion 2109 enters the shaft portion 2104a of the fixed member 2104, so that the slider 2106 and the fixed member 2104 do not interfere with each other. The lower end and the vicinity of the upper end of the leg portion 2110 are inclined from above to below, while the leg portion of the regulating member 2105 is inclined from below to above, forming an abutment surface between the leg portion 2110 of the slider 2106 and the regulating member 2105.

[0033] 5, a ball plunger 2111 functioning as an engagement protrusion is embedded in the arm main body 203b, and a spherical tip 2111b and a spring member 2111c for biasing the tip 2111b are housed in a casing 2111a. When the slider 2106 is in an upward position, the tip 2111b is pressed against the bottom surface of the slider 2106 and is housed in the casing 2111a against the biasing force of the spring member 2111c. When the slider 2106 moves downward and the ball plunger 2111 is exposed, the tip 2111b protrudes due to the biasing force of the spring member 2111c and becomes capable of engaging with the upper end of the slider 2106. In this embodiment, as configured as described above, when slider 2106 moves downward and engages with tip portion 2111b of ball plunger 2111, and then an attempt is made to move slider 2106 upward, a predetermined resistance force is applied, thereby preventing slider 2106 from moving upward inadvertently.

[0034] As shown in FIG. 3(A), the claw member 203a has an upper portion formed in a substantially trapezoidal shape, a lower portion bent at approximately 25 degrees toward the center of the gripping device 200, and a lower end portion formed in a semicircular shape. A guide groove 2201 is formed at the center of the upper end of the claw member 203a, through which the shaft portion 2104a of the fixing member 2104 provided on the arm main body portion 203b is inserted and guided, and which fits into the positioning protrusion 2102 formed on the arm main body portion 203b. As shown in FIG. 5, an insertion hole 2202 is formed at the lower end of the guide groove 2201, into which the shaft hole 2112 of the arm main body portion 203b is aligned when the claw member 203a is installed on the claw installation portion 2101. The upper surface of the insertion hole 2202 is shaped like a mortar along the shape of the pressing portion 2104b of the fixing member 2104. Below the insertion hole 2202, a positioning hole 2203 is provided into which a positioning boss 2103 provided on the arm main body portion 203b fits.

[0035] Since the claw member 203a is constructed as described above, it can be attached and detached freely from the arm body 203b, and can be easily replaced with an appropriate one depending on the size and shape of the prize P used in the game.

[0036] In this embodiment, as configured as described above, when the slider 2106 is in the lower position, the legs 2110 of the slider 2106 come into surface contact with and engage with the legs of the regulating member 2105, preventing the movement of the fixed member 2104. As a result, the claw member 203a is pressed against the arm main body 203b by the pressing portion 2104b of the fixed member 2104, and it is possible to prevent the claw member 203a from accidentally coming off the arm main body 203b.

[0037] In addition, the guide groove 2201 and positioning hole 2203 of the claw member 203a are fitted into and attached to the positioning protrusion 2102 and positioning boss 2103 of the arm main body 203b, respectively, thereby preventing the claw member 203a from wobbling and enabling it to be firmly fixed to the arm main body 203b.

[0038] The manner in which the claw member 203a of the gripping arm 203 configured as above is attached to and detached from the arm main body 203b will be described with reference to Fig. 7. In the state shown in Fig. 7(a), the leg 2110 of the slider 2106 and the leg of the regulating member 2105 are engaged with each other, so that the fixing member 2104 cannot be displaced.

[0039] First, when removing the claw member 203a from the arm main body portion 203b, as shown in FIG. 7(a), when the lever portion 2107 is pressed upward with a predetermined pressure, the tip portion 2111b of the ball plunger 2111 engaged with the rear end of the slider 2106 sinks into the casing 2111a against the biasing force of the spring member 2111c, enabling the slider 2106 to move upward, and the slider 2106 can be moved to the upper end position.

[0040] Then, as shown in Fig. 7(b), the engagement between the leg 2110 of the slider 2106 and the leg of the regulating member 2105 is released, and the fixed member 2104 becomes displaceable. In the state shown in Fig. 7(b), the state in which the claw member 203a is pressed by the pressing portion 2104b is maintained by the biasing force of the spring 2104 of the fixed member 2104, and the separation of the claw member 203a from the arm main body 203b is suppressed.

[0041] 7(c), when the retaining member 2104c of the fixed member 2104 is pressed, the fixed member 2104 moves toward the center of the gripping device 200 against the biasing force of the spring 2104d, and the pressing force of the pressing part 2104b on the claw member 203a is released. In this state, when the claw member 203a is pulled downward while being separated from the arm main body 203b, the shaft part 2104a of the fixed member 2104 is guided in the pulling direction along the guide groove 2201 of the claw member 203a, and the claw member 203a can be separated from the arm main body 203b.

[0042] On the other hand, when attaching the claw member 203a to the arm main body 203b, the claw member 203a can be easily attached to the arm main body 203b by reversing the procedure for removing the claw member 203a described above.

[0043] As described above, the gripping arm 203 of this embodiment includes an arm main body 203b and a claw member 203a detachable from the tip of the arm main body 203b, and is attached to the prize capturing device 200 to grip a prize. The claw member 203a has a guide groove 2201 at its base end, and is provided with an insertion hole 2202 communicating with the guide groove 2201. At the tip of the arm main body 203b, an axis hole 2112 is provided at a position that aligns with the insertion hole 2202 when the claw member 203a is attached to a predetermined position, and a fixing member 2104 is provided to be inserted into the axis hole 2112. The fixing member 2104 includes an axis portion 2104a capable of guiding the claw member 203a to a predetermined position while being guided by the guide groove 2201 of the claw member 203a, a pressing portion 2104b provided at the tip of the axis portion 2104a on the attachment side of the claw member 203a of the arm main body portion 203b for pressing the claw member 203a against the arm main body portion 203b with the claw member 203a attached at a predetermined position, a stopper member 2104c provided on the opposite side of the attachment side of the claw member 203a of the arm main body portion 203b for preventing the axis portion 2104a from coming off the shaft hole 2112, and a spring 2104b for biasing the pressing portion 2104b in a direction in which it presses against the arm main body portion 203b. As a result, a gripping arm and a prize acquisition device can be provided that can reduce the workload by simplifying the replacement of the claw member. Furthermore, when replacing the claw members, problems such as the claw members accidentally coming off the arm body and falling off are less likely to occur.

[0044] In this embodiment, the slider 2106 is provided, which is displaceable between a first state in which the fixed member 2104 is movable and a second state in which the pressing portion 2104b presses the claw member 203a against the arm main body 203b and holds the fixed member 2104. As a result, the claw member 203a can be held firmly, and the claw member can be prevented from accidentally coming off the arm main body.

[0045] Moreover, in this embodiment, the slider 2106 is provided on the side opposite to the attachment side of the claw member 203a of the arm main body 203b so as to be slidable between a first position and a second position in a direction intersecting the axial direction of the fixed member 2104. When the slider 2106 is at the first position, the slider 2106 is in a state in which it does not interfere with the axial movement of the fixed member 2104, thereby achieving the first state, and when the slider 2106 is at the second position, the slider 2106 is in the second state by restricting the axial movement of the fixed member 2104. As a result, the claw member can be easily held by sliding the holding member.

[0046] Furthermore, in this embodiment, there is provided ball plunger 2111 which advances near the rear end of slider 2106 in the sliding direction of slider 2106 when slider 2106 reaches the second position, and is configured to be retractable by applying a predetermined pressing force to slide the slider from the second position to the first position, thereby preventing the holding member from accidentally sliding and releasing the holding of the claw member.

[0047] Furthermore, in this embodiment, the restricting member 2105 that restricts the movable range of the fixed member 2104 is provided, so that the stroke of the fixed member can be kept to a minimum, thereby simplifying the operation of the fixed member.

[0048] The actions and effects described in the embodiments of the present invention are merely a list of the most preferable actions and effects resulting from the present invention, and the actions and effects of the present invention are not limited to those described in the embodiments of the present invention. [Explanation of symbols]

[0049] 100 Crane game machine (prize-winning game device) 200 Grasping device (prize acquisition device) 203 Grasping Arm 203a Claw member 203b Arm body 2104 Fixing member 2104a Shaft 2104b Pressing part 2104c Stopper member (stopper part) 2104d Spring (biasing means) 2105 Restricting member (restricting means) 2106 Slider (holding member) 2111 Ball Plunger 2112 Shaft hole 2201 Guide groove 2202 Insertion hole

Claims

1. A gripping arm includes an arm body and a claw member detachable from a tip end of the arm body, the gripping arm being attached to a prize-capturing device and used to grip a prize, The claw member has a guide groove at a base end portion and an insertion hole communicating with the guide groove, a shaft hole is provided at a tip end of the arm body at a position that aligns with the insertion hole when the claw member is attached to a predetermined position, and a fixing member is provided to be inserted into the shaft hole; a gripping arm characterized in that the fixing member comprises an axis portion capable of guiding the claw member to the predetermined position while being guided by the guide groove of the claw member, a pressing portion provided at the tip of the axis portion on the attachment side of the claw member of the arm main body portion for pressing the claw member against the arm main body portion with the claw member attached to the predetermined position, a slip-out prevention portion provided on the opposite side of the arm main body portion from the attachment side of the claw member for preventing the axis portion from slipping out of the axis hole, and a biasing means for biasing the pressing portion in the direction of pressing against the arm main body portion.

2. 2. The gripping arm according to claim 1, further comprising a holding member that is displaceable between a first state in which the fixed member is movable and a second state in which the fixed member is held in a state in which the pressing portion presses the claw member against the arm body portion.

3. the holding member is provided on an opposite side of the arm body portion to an attachment side of the claw member, the holding member being slidable between a first position and a second position in a direction intersecting an axial direction of the fixing member, The gripping arm according to claim 2, characterized in that, when the retaining member is in the first position, the retaining member is in a state where it does not interfere with axial movement of the fixed member, thereby achieving the first state, and when the retaining member is in the second position, the retaining member is in the second state by restricting axial movement of the fixed member.

4. The gripping arm according to claim 3, further comprising an engagement protrusion configured to advance near a rear end of the holding member in a sliding direction of the holding member when the holding member is at the second position, and to be retractable by applying a predetermined pressing force to slide the holding member from the second position to the first position.

5. 5. The gripping arm according to claim 1, further comprising a restricting means for restricting a movable range of the fixed member.

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