JP2523042Y2 - Drum chuck device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a chuck device for holding a drum, and more particularly to a chuck device in which chuck claws abut against the inner surface of the drum.

[Prior Art] In a chuck device for gripping a cylindrical work, a chuck claw is arranged so as to fit outside the work,
The work is gripped by reducing the gripping range of the chuck claw.

[Problem to be Solved by the Invention] In such a conventional chuck device, there is a possibility that the display characteristics of the contact portion of the outer peripheral surface may change from the position where the chuck pawl contacts the outer peripheral surface of the cylindrical work. . Therefore, the conventional chuck device cannot be applied to a chuck of a member requiring a high degree of uniformity on the outer peripheral surface, such as an OPC drum of an electrostatic copying machine.

[Means for Solving the Problems] A drum chuck device according to the present invention is a block inserted into a drum whose vertical direction is the axis of the drum. Barrel block, a plurality of slits extending in the barrel block in a direction parallel to the axis thereof, a base block fixed to the upper end of the barrel block, and vertically extending through the base block. A block formed of a center hole and a head block fixed to a lower end of the barrel block; and a lower end pivotally connected to the head block inside the block, and an upper end side passing through the slit to an outer side of the barrel block. A plurality of chuck claws rotatable in the vertical direction, a rod inserted into the barrel block through the center hole of the base block and movable up and down, and A drive device for advancing and retracting a rod connected to the chuck, and a link for rotating a chuck claw installed between the rod and a middle part in the longitudinal direction of the chuck claw, and an upper end side of the chuck claw. Is rotated in the direction away from the block and comes into contact with the inner peripheral surface of the drum, and is characterized in that an elastic member is provided at the upper end of the chuck pawl.

[Operation] In the drum chuck device of the present invention, when the rod is stroked downward, the chuck pawl is opened from the block via the link. Therefore, by opening the chuck claws with the block inserted in the drum, the chuck claws can be held in contact with the inner peripheral surface of the drum by holding the drum.

In the drum chuck device of the present invention, the lower end of the chuck pawl is pivotally attached to the block, and the upper end having the elastic member is provided so as to be detachable from the block. The side contacts the inner peripheral surface of the drum. Therefore, the frictional force between the contact portion on the upper end side of the chuck pawl and the drum urges the chuck pawl in the opening direction, and the drum is stably suspended.

Since the lower end of the chuck pawl is pivotally attached to the base block inside the block, and the upper end side passes through the slit of the barrel block, when the rod is stroked upward, the chuck pawl moves into the barrel block. As a result, the entire chuck device becomes thin and narrow. Therefore, by narrowing the chuck device in this manner, the block with the chuck claws can be easily taken in and out of the drum.

Embodiment An embodiment will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and FIG. 2 is an assembled perspective view of a block.

The chuck device 10 is for holding the drum 12, and includes a block 14 inserted into the drum 12. As shown in FIG. 2, the block 14 comprises a head block 16, a cylindrical barrel block 18 and a base block.
It is configured with 20. The head block 16 is provided with a small-diameter portion 22, and the tip of the barrel block 18 is fitted to the small-diameter portion 22. A screw (not shown) is inserted into an opening 24 provided in the barrel block 18, and the screw is screwed into a female screw hole 26 of the small-diameter portion 22.
18 is connected to the head block 16. Base block 20
Is provided with a small-diameter portion 28 which is fitted into the barrel block 18. A screw (not shown) is screwed into the female screw hole 32 of the small-diameter portion 28 through an opening 30 formed in the barrel block 18. Thereby, the base block 20 is connected to the barrel block 18.

The base block 20 is integrally provided with a connecting portion 34, and the block 14 is fixed to the mounting base 36 for mounting the chuck device via the connecting portion 34. The connection
A central hole 38 is provided in the central hole 38, and a rod 40
Is inserted.

A double-acting air cylinder 42 is connected to one end of the rod 40 so that the rod 40 can be driven forward and backward in the longitudinal direction. The other end of the rod 40 is a piston-like operating portion 44.

A cut 46 is formed in the head block 16,
One end of the chuck claw 48 is loosely inserted into the cut 46 and is pivotally supported by a pin 50. Reference numeral 52 in FIG. 2 indicates a mounting hole for the pin 50. The cut 46 is formed so as to form a cross shape when viewed from the axial direction of the head block, and four chuck claws 48 are provided.

The barrel block 18 is formed with four slits 54 at positions corresponding to the cuts 46, respectively. The operating portion 44 is provided with a notch 56 so as to face the notch 46, and one end of a link 58 is loosely inserted into the notch 56 and is pivotally connected with a pin 60. The other end of the link 58 is pivotally connected to the chuck pawl 48 via a pin 62. Although not shown,
A rubber or plastic tube or cap is fitted into the distal end portion 48a of the chuck claw 48 to abut against the inner peripheral surface of the drum 12 with frictional force, and the distal end portion 48 is rounded. The inner peripheral surface is configured not to be damaged at all even if the tip is pressed against the inner peripheral surface of the drum 12.

In the chuck device 10 configured as described above, the block 14 is inserted into the drum 12, and the air cylinder 42 is operated so as to advance the rod 40 downward in FIG. When the rod 40 advances, the chuck pawl 48 is rotated by the link 58 in a direction to open from the block 14. Then, the chuck claw tip portion 48a is pressed against the inner peripheral surface of the drum 12, and the drum 12 can be held. Since the chuck pawl 48 is urged by the air cylinder 42 and a rubber or plastic tube or cap is fitted into the chuck pawl tip 48a, the chuck pawl 48 hits the inner peripheral surface of the drum. Becomes elastic.
Further, the frictional force at the contact portion between the chuck claw 48 and the inner peripheral surface of the drum 12 becomes large. Thereafter, by moving the chuck device 10, the drum 12 is moved to a target position while being held by the chuck device 10. After moving to the target position, retract the rod 40 to
48 is retracted into the block 14, the drum 12 and the chuck device
The link with 10 is released. Therefore, by moving the mounting base 36 and raising the block 14, the block 14
Is extracted from the drum 12.

As described above, according to the present embodiment, the drum 12 can be held by the chuck claws 48 abutting on the inner peripheral surface of the drum 12, so that the outer peripheral surface of the drum has no change in the surface texture at the time of this holding. Never bring.

Further, as shown in FIG. 1, the chuck pawl 48 is rotated in the direction of falling from the vertical standing posture to the inclined posture, and the drum 12 is held. Further, the elastic member provided at the distal end portion 48a of the chuck claw 48 comes into contact with the inner peripheral surface of the drum 12, and the frictional force of the contact portion is largely maintained. Therefore, the drum 12
The gravitational force from which the user tries to escape acts in the direction in which the chuck claws 48 are opened. Therefore, even if the air cylinder 42 for expanding the chuck claws 48 becomes inoperable due to a power system accident or the like, the drum 12 can be stably suspended and held without falling off.

When the chuck claws 48 are retracted into the block 14 as shown in FIG. 1, the entire block 14 with the chuck claws 48 becomes extremely thin and narrow. For this reason, the block 14 with the chuck claws 48 can be very easily put in and out of the drum 12.

In the above embodiment, since the double-acting air cylinder is employed, both the opening operation and the closing operation of the chuck pawl are reliably performed. Further, the head block 16 has a tapered shape that tapers, so that the block 14 can be smoothly inserted into the drum 12.

Although four chuck claws 48 are provided in the above-described embodiment, the number may be set to another number, for example, three or five or more. Further, in the above embodiment, an air cylinder is used as a driving mechanism of the rod 40, but various driving mechanisms such as a solenoid may be adopted.

[Effects] As described above, according to the chuck device of the present invention, since the chuck claws are in contact with the inner peripheral surface of the drum, the drum can be held without any change in surface properties on the outer peripheral surface of the drum. Therefore, the present invention is very suitable for use in, for example, the manufacturing process of an electrostatic copying machine OPC drum.

Further, according to the chuck device of the present invention, it is possible to hold the drum extremely firmly. Since the chuck device of the present invention holds the drum by expanding the chuck pawl, it can be used for holding drums having various inner diameters.

Further, according to the chuck device of the present invention, since the elastic member is provided on the tip side of the chuck claw that is opened to the side from above and abuts on the inner peripheral surface of the drum, the corresponding contact portion and the drum The frictional force urges the chuck claws in a direction in which the chuck claws open, thereby enabling the drum to be stably suspended and held. Also, even if the force for urging the chuck pawl toward the open side in the rod driving advance / retreat device during the suspension holding of the drum disappears, this chuck device can stably hold the drum and hold it. It is.

In the present invention, the chuck pawl can be retracted through the slit of the barrel block, and the block with the chuck pawl can be made thin and narrow, so that the block with the chuck pawl can be easily taken in and out of the barrel. .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, and FIG. 2 is an assembled perspective view of a main part. 10 ... Chuck device, 12 ... Drum, 14 ... Block, 16 ... Head block, 18 ... Barrel block, 20 ... Base block, 38 ... Center hole, 40 ... Rod, 42 ... Air cylinder, 48 ...
Chuck claws, 54 ... slits, 58 ... links.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masato Uchida 4-12-12 Sendagaya, Shibuya-ku, Tokyo Mitsubishi Chemical Techno Engineers Co., Ltd. (72) Inventor Shio Seguchi 7-18-13 Sagamidai, Sagamihara City, Kanagawa Prefecture No. Mechatronic Sagaminai Co., Ltd. (56) References JP-A-61-30392 (JP, A) JP-A-51-43561 (JP, A) JP-A-63-67090 (JP, U) JP-A-51- 35089 (JP, Y2)

Claims (1)

(57) [Scope of request for utility model registration] 1. A block which is inserted from above into a drum whose vertical direction is the axis of the drum, and is a cylindrical barrel block whose vertical direction is the axis of the cylinder. A plurality of slits extending in a direction parallel to the core wire, a base block fixed to an upper end of the barrel block, a center hole penetrating vertically in the base block, and a lower end of the barrel block. A block comprising a fixed head block; and a plurality of chuck claws having a lower end pivotally attached to the head block inside the block, and an upper end rotatable to the outside of the barrel block through the slit. A vertically movable rod inserted into the barrel block through the center hole of the base block, and a rod advance / retreat driving device connected to the rod A link for pivoting the chuck pawl provided between the rod and the middle of the chuck pawl in the longitudinal direction. The upper end side of the chuck pawl pivots in a direction away from the block to move inside the drum. A chuck device for a drum, wherein the elastic member is provided on an upper end portion of the chuck claw, the chuck member being in contact with a peripheral surface.