Barrel Cam Device

Abstract

To realize an indexing device 1 comprising a compact and inexpensive clamp device.SOLUTION: A barrel cam device comprises: a barrel cam 14; a plurality of cam followers 20a engaging with the barrel cam; an output table 20 rotating according to rotation of the barrel cam; and a clamp device for clamping the output table when the output table stops.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a barrel cam device. [Background technology]

[0002] 2. Description of the Related Art As an indexing device for a workpiece in machining using a machine tool or the like, an indexing device using a cam mechanism is known (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-287138 A Summary of the Invention [Problem to be solved by the invention]

[0004] When attempting to provide a clamping device for clamping an output table to an indexing device at low cost, there was a problem that the indexing device would become too large to fit the clamping device in. Also, there was a problem that attempting to configure the clamping device with small parts so that the clamping device would fit in would result in high costs.

[0005] The present invention has been made in view of the above problems, and an object of the present invention is to realize an indexing device equipped with a compact and inexpensive clamping device. [Means for solving the problem]

[0006] The main invention for achieving the above object includes a barrel cam, an output table having a plurality of cam followers that engage with the barrel cam and rotates as the barrel cam rotates, and a clamp device that clamps the output table when the output table stops. and a support part that rotatably supports the output table, the clamp device has a plate-shaped member including a fixed part fixed to the output table and an opposing part that faces the support part in a non-contact state when the output table rotates, and a pressing member that presses the plate-shaped member to the support part when the output table is stopped, the fixed part is fixed to an underside of the table of the output table, the opposing part faces a support part underside of the support part in a non-contact state when the output table rotates, and the pressing member presses the opposing part to the support part underside when the output table is stopped, the fixed part has a through hole, and the fixed part and the cam follower are fixed to the underside of the table by a common bolt with the cam follower passing through the through hole. The barrel cam device is characterized by the above.

[0007] Other features of the present invention will become apparent from the following detailed description of the present invention and the accompanying drawings. Effect of the Invention

[0008] According to the present invention, it is possible to realize an indexing device equipped with a clamping device that is compact and inexpensive. [Brief description of the drawings]

[0009] [Figure 1] 1A and 1B are schematic plan and side views of an indexing device 1. [Diagram 2] FIG. 2 is an explanatory diagram for explaining a clamp device. [Diagram 3] FIG. 2 is a schematic plan view of a pressing member 32. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] At least the following matters will become apparent from the description of this specification and the accompanying drawings.

[0011] A barrel cam device comprising: a barrel cam; an output table having a barrel cam; a plurality of cam followers that engage with the barrel cam and that rotates as the barrel cam rotates; and a clamp device that clamps the output table when the output table stops.

[0012] Such a barrel cam device makes it possible to realize an indexing device equipped with a compact and inexpensive clamping device.

[0013] It is desirable for such a barrel cam device to include a support portion that rotatably supports the output table, and for the clamp device to include a plate-shaped member that includes a fixed portion fixed to the output table and an opposing portion that faces the support portion in a non-contact state when the output table rotates, and a pressing member that presses the plate-shaped member against the support portion when the output table stops.

[0014] According to such a barrel cam device, the clamp device has a simple configuration of a plate-like member and a pressing member, so that the clamp device can be made inexpensively.

[0015] It is preferable that the barrel cam device further comprises a housing for accommodating the output table, and that the plate-like member and the pressing member are provided within the housing.

[0016] According to such a barrel cam device, it is possible to effectively utilize the relatively large space within the housing of the barrel cam device.

[0017] In such a barrel cam device, it is desirable that the fixed portion is fixed to the underside of the output table, the opposing portion faces the underside of the support portion of the support portion in a non-contact state when the output table rotates, and the pressing member presses the opposing portion against the underside of the support portion when the output table stops.

[0018] According to such a barrel cam device, clamping of the output table can be easily achieved.

[0019] In such a barrel cam device, it is desirable that the fixed portion has a through hole, and that the fixed portion and the cam follower are fixed to the underside of the table by a common bolt with the cam follower passing through the through hole.

[0020] According to such a barrel cam device, since the plate-like member and the cam follower are fixed with a common bolt, no bolt is required to fix the plate-like member, so that the number of parts can be reduced and costs can be cut.

[0021] In such a barrel cam device, it is preferable that the pressing member is a piston member that moves when the output table is stopped and comes into contact with the opposing portion, thereby deforming the opposing portion and pressing it against the support portion.

[0022] With this type of barrel cam device, the output table is clamped not only by the frictional force generated between the plate-shaped member and the support part, but also by the frictional force generated between the plate-shaped member and the piston member, making the clamping force stronger.

[0023] It is desirable for such a barrel cam device to have a rotating shaft body that is attached to the center of the output table and rotates integrally with the output table, and the piston member is provided on both the side where the barrel cam is located and the side where the barrel cam is not located, as viewed from the rotating shaft body.

[0024] With this type of barrel cam device, the area of ​​the piston member can be made larger than when the piston member is not provided across both the side where the barrel cam is located and the side where the barrel cam is not located, and the pressure of the compressed gas, etc. becomes a larger force that presses against the plate-shaped member, making it possible to clamp the output table with a greater force.

[0025] In such a barrel cam device, it is preferable that the piston member is formed with a groove for accommodating the cam follower in a non-contact state.

[0026] According to such a barrel cam device, it is possible to increase the rigidity of the piston member while preventing the piston member from interfering with the rotation of the output table.

[0027] Such a barrel cam device preferably comprises a housing for accommodating the output table, a part of the housing being a cylinder member for accommodating the piston member, the housing being provided with a pressurized air inlet hole for introducing pressurized air into the cylinder member, and the area of ​​the pressed surface of the piston member pressed by the pressurized air being equal to or greater than half the area of ​​the table surface of the output table.

[0028] With this type of barrel cam device, by making the area of ​​the piston member at least half the area of ​​the output table, the pressure of the compressed gas, etc., exerts a greater force on the plate-like member compared to when the area is less than half, making it possible to clamp the output table with greater force.

[0029] ===About Indexing Device 1=== The indexing device 1 (corresponding to a barrel cam device) according to this embodiment will be described with reference to the drawings. The indexing device 1 can be used, for example, in an NC table for a machine tool, a positioner for a robot, a rotating shaft for a robot, etc.

[0030] 1 is a schematic plan view and a schematic side view of an indexing device 1, with the upper view being the schematic plan view and the lower view being the schematic side view. In the drawings relating to the present embodiment, some members may be omitted as appropriate in order to easily explain the present invention.

[0031] The indexing device 1 according to this embodiment has an X direction, a Y direction, and a Z direction, and the X direction and the Y direction intersect with each other, and the Z direction intersects with both the X direction and the Y direction. In the upper diagram of Fig. 1, the horizontal direction of the paper is the X direction, and the left side (right side) of the paper is called the left (right), and the vertical direction of the paper is the Y direction, and the upper side (lower side) of the paper is called the back (front). In the lower diagram of Fig. 1, the vertical direction of the paper is the Z direction (vertical direction), and the upper side (lower side) of the paper is called the top (bottom).

[0032] The indexing device 1 has a housing 3, and accommodated inside the housing 3 are an input shaft 12, a barrel cam 14, an output table 20, a rotating shaft body 22, a plate-like member 30, and a pressing member 32. In addition, a motor 10 is attached to the housing 3 as a drive unit.

[0033] The motor 10 is provided so that its rotation shaft is aligned along the Y direction, and is connected to the input shaft 12 by a coupling 16 .

[0034] The input shaft 12 is provided along the Y direction, and is rotatably supported by an input bearing 18. The front side of the input shaft 12 extends further forward than the input bearing 18, and this extending portion is connected to the rotating shaft of the motor 10 by a coupling 16.

[0035] Further, the input shaft 12 is provided at both ends of the barrel cam 14 in the Y direction, and the barrel cam 14 and the input shaft 12 rotate integrally.

[0036] Moreover, the barrel cam 14 has a barrel cam groove 14a, and the spiral barrel cam groove 14a is provided along the direction of the input shaft 12. The rotation of the barrel cam 14 is transmitted to the output table 20 by engaging a cam follower 20a of an output table 20, which will be described later, with the barrel cam groove 14a. The input shaft 12 and the barrel cam 14 may be integrated by joining pieces that have been machined separately, or may be manufactured by machining a cam groove on an integrally manufactured shaft-shaped piece.

[0037] The output table 20 has a circular shape, and is rotatably supported by a support portion 24. In this embodiment, the support portion 24 is a large-diameter four-point supported ball bearing. The output table 20 includes a plurality of cam followers 20a that engage with the barrel cam 14 (barrel cam groove 14a), and rotates around a rotation axis along the Z direction as the barrel cam 14 rotates around the input shaft 12 along the Y direction.

[0038] The cam follower 20a is a part that engages with the barrel cam groove 14a, is a cylindrical rotating body that can rotate on its own axis, and is provided so that the rotation axis direction is along the Z direction. A plurality of cam followers 20a are provided at equal intervals along a circle centered on the rotation center of the output table 20. In this embodiment, 16 cam followers 20a are provided at equal intervals (every 22.5 degrees).

[0039] Further, the cam follower 20a is engaged with the barrel cam groove 14a of the barrel cam 14 on the lower side of the output table 20, and this engaged cam follower 20a moves while being guided by the barrel cam groove 14a.

[0040] Specifically, when the barrel cam 14 rotates counterclockwise as viewed from the front side, the engaged cam follower 20a is guided by the spiral barrel cam groove 14a and moves from the front side to the back side along the circumferential direction of the output table 20. In other words, the output table 20 rotates clockwise as viewed from above.

[0041] In order to achieve high precision in the rotation of the output table 20, i.e., to achieve high-precision output, the cam follower 20a and the barrel cam groove 14a are engaged with high precision so as to prevent backlash, misalignment, rattling, etc. (The engagement method for achieving high-precision output from the cam mechanism is a well-known technology, so a description thereof will be omitted here).

[0042] The rotating shaft body 22 is attached to the center (hollow portion) of the output table 20 along the Z direction, and rotates integrally with the output table 20.

[0043] In addition, the rotating shaft body 22 may be one that does not have a hollow portion at its center (a solid shaft), but the rotating shaft body 22 according to this embodiment is a so-called hollow shaft that has a hollow portion. In other words, a circular space that penetrates the rotating shaft body 22 in the vertical direction is provided at the center of the rotating shaft body 22.

[0044] <<<About the clamping device>>> The indexing device 1 according to this embodiment has a clamping device that clamps the output table 20 when the output table 20 stops. The clamping device is, for example, a device that fixes an NC table (output table 20) in an NC table for a machine tool so that the NC table (output table 20) does not move during machining after indexing, and is provided for the purpose of improving machining accuracy, etc.

[0045] In other words, the indexing device 1 has a barrel cam 14, an output table 20 having a plurality of cam followers 20a that engage with the barrel cam 14 and rotates as the barrel cam 14 rotates, and a clamping device that clamps the output table 20 when the output table 20 stops.

[0046] The clamping device will be described in detail below with reference to the drawings. Figure 2 is an explanatory diagram for explaining the clamping device, in which Figure 2a shows the output table 20 not clamped when it is rotating, and Figure 2b shows the output table 20 clamped when it is stopped.

[0047] 1 and 2, the clamp device has a plate-shaped member 30, a pressing member 32, and a piston back member 34, and the plate-shaped member 30 and the pressing member 32 are provided inside the housing 3. Then, as shown in Fig. 2b, when the output table 20 stops, the pressing member 32 presses the plate-shaped member 30 against the support portion 24, thereby clamping the output table 20.

[0048] The plate-shaped member 30 is a disk-shaped metal plate made of stainless steel, phosphor bronze, or the like, and has high rigidity in the circumferential direction but low rigidity in the thickness direction. In other words, it is difficult to deform when a force is applied in the circumferential direction, but it is easily deformed when a force (a force that deforms in the thickness direction) is applied in the thickness direction. In addition, since the plate-shaped member 30 is fixed to the output table 20, it rotates as the output table 20 rotates.

[0049] The plate-like member 30 has a fixed portion 30b fixed to the output table 20, and a facing portion 30c which faces the support portion 24 in a non-contact state when the output table 20 rotates. As shown in Fig. 2a, this facing portion 30c is held so as not to come into contact with any of the pressing member 32, the housing 3, and the support portion 24 when the output table 20 rotates (i.e., it does not interfere with the rotation of the output table 20).

[0050] In addition, the fixed portion 30b is fixed to the table underside 20d of the output table 20, and the opposing portion 30c faces the support portion underside 24a of the support portion 24 in a non-contact state when the output table 20 rotates, and the pressing member 32 presses the opposing portion 30c against the support portion underside 24a when the output table 20 stops.

[0051] Furthermore, the fixed portion 30b of the plate-like member 30 has a through hole 30a, the cam follower 20a passes through the through hole 30a, and the plate-like member 30 and the cam follower 20a are fixed to the table underside 20d of the output table 20 by one bolt 20b. In other words, the fixed portion 30b has a through hole 30a, and with the cam follower 20a passing through the through hole 30a, the fixed portion 30b and the cam follower 20a are fixed to the table underside 20d by the common bolt 20b.

[0052] Fig. 3 is a schematic plan view of the pressing member 32. The pressing member 32 is substantially D-shaped in plan view (when viewed from above in the Z direction), and is provided on its surface with a protrusion 32a (the part with diagonal lines pointing upward to the right in Fig. 3) and a groove 32b (the part with diagonal lines pointing downward to the right in Fig. 3).

[0053] The protrusion 32a is provided on a portion that is outside the outer circumferential edge of the output table 20 when installed, as shown in Fig. 2, and along the outer periphery of the pressing member 32, as shown in Fig. 3, and is provided so as to minimize the contact area in order to increase the contact surface pressure with the plate-like member 30. Moreover, the groove 32b is provided along the arrangement of the cam followers 20a, as shown in Figs. 1 and 3.

[0054] In addition, the pressing member 32 moves upward (toward the plate-shaped member 30) by compressed air introduced from a compressed air introduction hole 36 (see FIG. 1) provided in the housing 3 below the pressing member 32, and the protruding portion 32a abuts against the plate-shaped member 30 to press it. As a result, as shown in FIG. 2b, the protruding portion 32a of the pressing member 32 deforms the plate-shaped member 30, and presses the plate-shaped member 30 on the opposite side to the side where the protruding portion 32a abuts against the support portion 24, thereby clamping the output table 20. In addition, as will be described later in detail, when the introduced compressed air is discharged, the pressing member 32 moves downward by the piston back member 34, and changes from the clamped state to the unclamped state as shown in FIG. 2a. In other words, the pressing member 32 performs a piston movement up and down within the housing 3.

[0055] In other words, the pressing member 32 (the protruding portion 32a) is a piston member that moves when the output table 20 is stopped, and comes into contact with the facing portion 30c to deform the facing portion 30c and press it against the support portion .

[0056] 1, the piston member (pressing member 32) is provided across the left and right sides in the X direction of the rotating shaft body 22. In other words, the piston member (pressing member 32) is provided across both the side where the barrel cam 14 is located and the side where the barrel cam 14 is not located, as viewed from the rotating shaft body 22.

[0057] As shown in Figures 1 to 3, the piston member (pressing member 32) is formed with a groove portion 32b for accommodating the cam follower 20a fixed to the output table 20 in a non-contact state so as not to interfere with the rotation of the output table 20.

[0058] As described above, the piston member moves upward by the compressed air introduced through the compressed air introduction hole 36, which is achieved by making a part of the housing 3 into a cylinder member for the movement of the piston member. The introduced compressed air is received by the entire surface of the piston member (the entire surface of the approximate D shape shown in FIG. 3), so that the area to which it is applied is more than half of the area 20c of the table surface of the output table 20 (the shaded area in FIG. 1).

[0059] In other words, a part of the housing 3 serves as a cylinder member for accommodating a piston member (pressing member 32), and the housing 3 is provided with a pressurized air inlet hole 36 for introducing pressurized air into the cylinder member, and the area of ​​the pressed surface of the piston member (pressing member 32) pressed by the pressurized air is more than half the area 20c of the table surface of the output table 20.

[0060] The piston back member 34 is a member that moves the piston member (pressing member 32) downward to release the contact between the opposing portion 30c and the support portion 24 and the protruding portion 32a (to create a gap), and its upper end is fixed to the piston member (pressing member 32) within the housing 3, and its lower end is subjected to a force from above to below by a spring 34a outside the housing 3.

[0061] In other words, when the pressure of the compressed air introduced during clamping decreases (the compressed air is expelled from inside the cylinder member), the force of the compressed air pressing the piston member (pressing member 32) upward decreases, so that the piston member (pressing member 32) moves downward due to the spring force of spring 34a, and the output table 20 changes from the clamped state to the unclamped state.

[0062] <<<About the effectiveness of the indexing device 1>>> As described above, the indexing device 1 according to this embodiment includes the barrel cam 14, the output table 20 that is equipped with a plurality of cam followers 20a that engage with the barrel cam 14 and rotates as the barrel cam 14 rotates, and a clamping device that clamps the output table 20 when the output table 20 stops. Therefore, it is possible to realize an indexing device 1 that is compact and equipped with an inexpensive clamping device.

[0063] When attempting to provide a clamping device for clamping an output table to an indexing device at low cost, there was a problem that the indexing device would become too large to fit the clamping device in. Also, there was a problem that attempting to configure the clamping device with small parts so that the clamping device would fit in would result in high costs.

[0064] In contrast, when the indexing device 1 is a barrel cam device, there are more locations where the clamping device can be installed compared to when, for example, a roller gear cam is used. In other words, by using a barrel cam device as the indexing device 1, there are more locations where the clamping device can be installed, and it is possible to realize an indexing device 1 equipped with a compact and inexpensive clamping device.

[0065] Furthermore, by providing the indexing device 1 with a clamping device, for example, the rigidity in the rotational direction of the output table 20 is increased, so that the machining accuracy of the workpiece can be improved. Also, for example, when an overload acts on the output table 20, the clamping device can ensure safety. Also, for example, if the clamping device is provided, workers can work with peace of mind.

[0066] In the above embodiment, the clamp device includes the support portion 24 that rotatably supports the output table 20, the plate-like member 30 that includes the fixed portion 30b fixed to the output table 20 and the facing portion 30c that faces the support portion 24 in a non-contact state when the output table 20 rotates, and the pressing member 32 that presses the plate-like member 30 against the support portion 24 when the output table 20 stops. This makes it possible to provide an inexpensive clamp device because the clamp device has a simple configuration of the plate-like member 30 and the pressing member 32.

[0067] In the above embodiment, the housing 3 for accommodating the output table 20 is provided, and the plate-like member 30 and the pressing member 32 are provided inside the housing 3. This makes it possible to effectively utilize the relatively wide space inside the housing 3 of the indexing device 1 (barrel cam device).

[0068] In addition, in the above embodiment, the fixed portion 30b is fixed to the table underside 20d of the output table 20, the opposing portion 30c faces the support portion underside 24a of the support portion 24 in a non-contact state when the output table 20 rotates, and the pressing member 32 presses the opposing portion 30c against the support portion underside 24a when the output table 20 stops.

[0069] The support part underside 24a and the table underside 20d are arranged on approximately the same plane due to their structure. Therefore, if they are designed to have a slight difference between them rather than making them completely on the same plane, the difference can be used to easily create a state in which the fixed part 30b of the plate-like member 30 is fixed to the table underside 20d and the facing part 30c of the plate-like member 30 faces the support part underside 24a with a slight gap when not clamped. In other words, by using the support part underside 24a and the table underside 20d, it is possible to easily clamp the output table 20.

[0070] In addition, in the above embodiment, the fixed portion 30b has a through hole 30a, and the fixed portion 30b and the cam follower 20a are fixed to the table underside 20d by a common bolt 20b with the cam follower 20a passing through the through hole 30a.

[0071] By fixing the plate-like member 30 and the cam follower 20a with the common bolt 20b, no bolt is required for fixing the plate-like member 30, so that the number of parts can be reduced and costs can be reduced.

[0072] In the above embodiment, the pressing member 32 is a piston member that moves when the output table 20 is stopped and comes into contact with the facing portion 30c to deform the facing portion 30c and press it against the support portion 24.

[0073] As a result, in addition to clamping the output table 20 by the frictional force generated between the plate-shaped member 30 and the support portion 24, the output table 20 is also clamped by the frictional force generated between the plate-shaped member 30 and the piston member (pressing member 32), making the clamping force stronger.

[0074] In addition, in the above embodiment, a rotating shaft body 22 is attached to the center of the output table 20 and rotates integrally with the output table 20, and a piston member (pressing member 32) is provided across both the side where the barrel cam 14 is located and the side where the barrel cam 14 is not located, as viewed from the rotating shaft body 22.

[0075] As a result, the area of ​​the piston member (pressing member 32) can be made larger than when the piston member (pressing member 32) is not provided across both the side where the barrel cam 14 is located and the side where the barrel cam 14 is not located, and the pressure of the compressed gas, etc. becomes a larger force that presses against the plate-like member 30, so that the output table 20 can be clamped with a large force.

[0076] In the above embodiment, the piston member (pressing member 32) is formed with the groove portion 32b for accommodating the cam follower 20a in a non-contact state. This prevents the piston member (pressing member 32) from interfering with the rotation of the output table 20.

[0077] In addition, in the above embodiment, a housing 3 is provided for accommodating the output table 20, a part of the housing 3 is a cylinder member for accommodating a piston member (pressing member 32), the housing 3 is provided with a pressurized air inlet hole 36 for introducing pressurized air into the cylinder member, and the area of ​​the pressed surface of the piston member (pressing member 32) pressed by the pressurized air is more than half the area of ​​the table surface of the output table 20.

[0078] Furthermore, by making the area of ​​the piston member (pressing member 32) larger to more than half the area of ​​the output table 20, the pressure of the compressed air exerts a greater force on the plate-like member compared to when it is less than half, making it possible to clamp the output table with greater force.

[0079] ===Other embodiments=== The above-mentioned embodiment is for the purpose of facilitating understanding of the present invention, and is not intended to limit the present invention. The present invention can be modified or improved without departing from the spirit of the present invention, and the present invention naturally includes its equivalents.

[0080] In the above embodiment, a four-point support ball bearing is used for the support portion 24, but the present invention is not limited to this. For example, a cross roller bearing may be used.

[0081] In the above embodiment, the pressing member 32 is moved upward by compressed air, but the present invention is not limited to this. For example, the pressing member 32 may be moved upward by hydraulic pressure. [Explanation of symbols]

[0082] 1 indexing device (barrel cam device), 3 housing, 10 motor, 12 input shaft, 14 barrel cam, 14a barrel cam groove, 16 coupling, 18 input bearing, 20 output table, 20a cam follower, 20b bolt, 22 rotating shaft body, 24 Support part, 30 Plate member, 30a Through hole, 30b Fixed part, 30c Opposing part, 32 pressing member (piston member), 32a protruding portion, 32b groove portion, 34 piston back member, 34a spring, 36 compressed air introduction hole,

Claims

1. Barrel cam and an output table including a plurality of cam followers that engage with the barrel cam and that rotates as the barrel cam rotates; a clamp device that clamps the output table when the output table is stopped; having a support portion that rotatably supports the output table, The clamping device comprises: a plate-like member including a fixed portion fixed to the output table and an opposing portion opposing the support portion in a non-contact state when the output table rotates; a pressing member that presses the plate-like member against the support portion when the output table is stopped, the fixed portion is fixed to an underside of the output table, the facing portion faces a lower surface of the support portion in a non-contact state when the output table rotates, the pressing member presses the facing portion against a lower surface of the support portion when the output table is stopped; The fixed portion has a through hole, a barrel cam device, characterized in that the fixed portion and the cam follower are fixed to the underside of the table by a common bolt with the cam follower passing through the through hole.

2. 2. The barrel cam device according to claim 1, a housing for accommodating the output table; A barrel cam device, wherein the plate-like member and the pressing member are provided within the housing.

3. A barrel cam device as claimed in claim 1 or claim 2, The pressing member is a piston member that moves when the output table is stopped and comes into contact with the opposing portion, thereby deforming the opposing portion and pressing it against the support portion.

4. 4. The barrel cam device according to claim 3, a rotating shaft body attached to a center portion of the output table and rotating integrally with the output table; A barrel cam device, characterized in that the piston member is provided across both the side where the barrel cam is located and the side where the barrel cam is not located, as viewed from the rotating shaft body.

5. The barrel cam device according to claim 3 or 4, A barrel cam device, characterized in that a groove portion for accommodating the cam follower in a non-contact state is formed in the piston member.

6. The barrel cam device according to any one of claims 3 to 5, a housing for accommodating the output table; A part of the housing is a cylinder member for accommodating the piston member, the housing is provided with a pressurized air inlet for introducing pressurized air into the cylinder member, 2. A barrel cam device according to claim 1, wherein an area of ​​a surface of the piston member pressed by the compressed air is equal to or larger than half an area of ​​a table surface of the output table.

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