JPH091406A - Stroke detection device for rotating cylinder - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a highly safe rotating cylinder that does not catch a finger or the like in the gap between the rear side of the cylinder body and the dog member. [Structure] A piston 6 is slidably fitted into a piston chamber 5 of a cylinder body 2, and a cylinder is provided in a space on an outer peripheral side of a distributor 10 arranged on a shaft portion 8 projecting on the rear side of the cylinder body 2. A rear cover 17 that covers the rear side of the main body 2, an annular outer cover 18 that closely covers the rear outer peripheral side of the cylinder body 2 over the entire stroke range of the piston 6, and a dog 19 for detecting the stroke of the piston 6. A stroke detection device 16 is configured by disposing a dog member 15 that is movable integrally with the piston 6 that is composed of.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stroke detecting device for a rotary cylinder, and more particularly to a stroke detecting device for a rotary cylinder provided with a cover for covering a gap between a rear portion of a cylinder body and a dog member.

[0002]

2. Description of the Related Art Conventionally, a rotary cylinder as shown in FIG. 5 has been known. The rotary cylinder 1 is composed of a casing 3 and a front wall member 4, and a cylinder body 2 that rotates integrally with a chuck (not shown) is provided with a piston chamber 5 having an axis of rotation as an axis. Is fitted so as to be slidable in the axial direction. A shaft portion 8 is projectingly provided on the rear side of the cylinder body 2, and a distributor 10 is arranged on the outer periphery thereof. An operating rod 20 penetrates the cylinder body 2 in the axial direction, one end of the operating rod 20 is connected to the piston 6, and the other end of the operating rod 20 is disposed on the outer peripheral side of the distributor 10.
A dog member 15 that moves together with is attached.
In order to prevent a finger or the like from being caught in the gap between the dog member 15 and the rear side of the cylinder body 2, a clearance X is provided in this gap so that the finger or the like is not caught when the gap is minimized. .
Further, a proximity switch 13 is provided on the outer periphery of the distributor 10 via a bracket 14, and the stroke end of the piston 6 is detected by the movement of the dog member 15.

[0003]

In the conventional stroke detecting device for a rotary cylinder described above, a margin is provided so that a finger or the like is not caught when the clearance between the dog member and the rear side of the cylinder body is minimized. However, since a finger or the like enters the gap from the outer peripheral side of the rotary cylinder, if the finger enters the gap together with the tool or the like, there is a problem that the dog member and the rear side of the cylinder body pinch the finger. For this reason, the operator needs to be careful not to pinch his / her fingers together with the tool in the gap between the dog member and the rear side of the cylinder body.

An object of the present invention is to provide a highly safe rotating cylinder which covers the gap between the rear side of the cylinder body and the dog member so that a finger or the like is never caught in this gap. .

[0005]

In order to solve the above-mentioned problems, according to a first aspect of the present invention, a cylinder body is provided with a piston chamber having an axis of rotation as an axis, and the piston is slidable in the axial direction in the piston chamber. In a fitted rotary cylinder, a dog member is provided on the rear side of the cylinder body, which is connected to the piston, is synchronized with the piston, and is integrally movable in the axial direction. This dog member is composed of a rear cover for covering and an outer peripheral portion of the rear cover projecting so as to closely cover the rear outer peripheral side of the cylinder main body over the entire stroke range of the piston. It is characterized in that a dog for detecting the stroke of the piston is provided. According to a second aspect of the present invention, a shaft portion having the same axis is provided on the rear side of the cylinder body in a projecting manner, a distributor is disposed on the outer periphery of the shaft portion, and the outer peripheral side space of the distributor is connected to the piston in the axial direction. It is characterized in that a dog member that can move integrally with the piston is provided.

[0006]

In the stroke detecting device of the rotary cylinder of the present invention, the rear side of the cylinder body is covered with the rear cover of the dog member, and the outer peripheral side cover of the dog member covers the rear portion of the cylinder body over the entire stroke range of the piston. Since the outer peripheral side is covered closely, there is no part that may pinch a finger, etc., preventing an accident that a finger etc. is caught between the dog member that moves axially forward with respect to the cylinder body and the cylinder body. It can be done and the safety can be improved. In addition, since the dog member is configured from each cover and the dog for stroke detection is provided on this dog member, the number of parts is small and the configuration is simple as compared with the conventional type in which the cover is separately provided.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a stroke detecting device for a rotary cylinder according to the present invention will now be described with reference to the drawings. 1 and 2 show a first embodiment in which the present invention is embodied in a rotary cylinder. The cylinder body 2 of the rotary cylinder 1 is composed of a casing 3 and a front wall member 4, and a spindle (not shown) such as a lathe is coupled to the front surface of the front wall member 4 and integrated with a chuck (not shown) via the spindle. Rotate to. Inside the cylinder body 2, there is a piston chamber 5 whose axis is the rotation center line.
Are formed. A piston 6 is fitted in the piston chamber 5 so as to be slidable in the axial direction, and a piston rod 7 penetrating the front wall member 4 is projectingly provided on the front side of the piston 6 and attached to the piston rod 7. The jaws of the chuck can be opened / closed via a connecting rod (not shown).

On the rear side of the cylinder body 2, a shaft portion 8 having the same axis is provided so as to project, and a pressure fluid distributed from a distributor 10 described later is provided in the piston chamber 5 in the shaft portion 8 and the casing 3.
A flow path 9 is formed to lead to. The distributor 10 is attached to the outer periphery of the shaft portion 8 via a bearing so as to be relatively rotatable, and is provided with a supply / discharge port 12 for supplying / discharging the pressure fluid to / from the flow path 9 via the annular groove 11. The distributor 10 is held stationary with respect to the rotation of the spindle. Further, a proximity switch 13 for detecting the stroke end of the piston 6 is attached to the outer periphery of the distributor 10 via a bracket 14, and a dog member 15 is axially moved on the rear side of the cylinder body 2. It is freely crowned. The dog member 15 covers the rear side of the cylinder body 2 and the rear cover 1
7 and an outer peripheral side of the rear side cover 17, and an annular outer peripheral side cover 18 projecting so as to closely cover the rear side outer peripheral side of the cylinder body 2 over the entire stroke range of the piston 6. A dog 19 for detecting the stroke of the piston 6 is provided integrally with the dog member 15.

An operating rod 20 is axially penetrated through the casing 3, the front end of which is connected to the piston 6 and the rear end of which is connected to the rear cover 17. As a result, the dog member 15 is connected to the piston 6 via the operating rod 20 in synchronization with the piston 6 and is integrally movable in the axial direction.

In the stroke detecting device 16 of the rotary cylinder 1 of the first embodiment constructed as described above, the pressure fluid is supplied to the piston chamber 5 by the distributor 10, the piston 6 is driven, and the dog member 15 is Based on the position of the dog 19, the stroke ends before and after the piston 6 are moved together, and are detected by the proximity switch 13. Since the outer peripheral cover 18 of the dog member 15 covers the rear side of the cylinder body 2 even when the piston 6 moves to the rear stroke end, a finger or the like may be inserted in the gap between the rear side of the cylinder body 2 and the dog member 15. Will not be caught and the safety can be improved.

FIG. 3 shows a second embodiment in which the present invention is embodied in a double rotary cylinder. In this embodiment, the cylinder body 31 is composed of a block member 32 and a front wall member 33, and a spindle is connected to the front surface of the front wall member 33. A cylindrical partition member 3 is provided on the front surface of the block member 32.
6 is fixed so as to project forward from the front wall member 33,
A state in which a large-diameter piston chamber 38 is formed between the partition member 36 and the block member 32 on the outer side of the rear end, and a small-diameter piston chamber 39 is formed on the inner side between the small-diameter rod 45 and the small-diameter piston chamber 39 so that their axial positions are completely overlapped. It is provided inside and outside.

A first piston 41 is accommodated in the large-diameter piston chamber 38 on the outside, and a hollow rod 42 is provided on the front surface thereof so as to protrude forward through a gap between the front wall member 33 and the partition member 36. ing. The second piston 43 is accommodated in the inner small-diameter piston chamber 39 in a state in which the second piston 43 is prevented from rotating by a pin 44, and a hollow small-diameter rod 45 is formed in the second piston 43 so as to project forward and backward. The protruding portion penetrates the partition member 36 and the hollow rod 42, and the rearward protruding portion penetrates the block member 32. Then, the first and second pistons 41, 43 are driven on the same axis by the pressurized fluid supplied to the piston chambers 38, 39, and the hollow rod 42 is moved by the outer peripheral surface of the partition member 36.
The small diameter rod 45 is slidably guided by the inner peripheral surfaces of the partition wall member 36 and the block member 32.

A distributor 47 for supplying a pressure fluid to the large-diameter and small-diameter piston chambers 38 and 39 is inserted inside the small-diameter rod 45 via a bearing 48 and a seal 49 so as to be relatively rotatable and integrally movable in the axial direction. Has been done. Distributor 4
A second dog member 71 having a diameter slightly larger than that of the cylinder body 31 is coupled to the rear end of the bolt 7 by a bolt 52.
Second dog member 71 covering the rear side of the first dog member 70
The rear side or the bar 51 is provided with a supply port and a drain recovery port 62 (only one is shown) connected to the four flow paths 53 of the distributor 47, and pipes connected to these ports 62 ( By suspending a part of (not shown), the distributor 47 is held in a stopped state when the spindle rotates.

A sleeve-like joint 54 is interposed between the distributor 47 and the small-diameter rod 45 so as to rotate integrally with the small-diameter rod 45, and each passage 53 of the distributor 47 is provided in the joint 54. Annular groove 56 for connecting to the flow path 55 of
And a communication hole 57 is formed. 2 of small diameter rod 45
The two flow passages 55 are directly opened in the small-diameter piston chamber 39 before and after the second piston 43, and the remaining two flow passages 55 and the wide groove 58 and the passage provided in the block member 32, the partition member 36, and the hollow rod 42, respectively. It is connected to the large-diameter piston chamber 38 via 59. Between the front end of the distributor 47 and the small-diameter rod 45, a sleeve 60 for preventing the bearing from coming off is fitted and a mechanical seal 60a having a well-known structure for preventing oil leakage between these relative rotary members is provided. The sleeve 60 has a small diameter rod 45
It is held by the retaining member 61 at the front end.

A first dog member 70 is axially movably provided in the outer space of the distributor 47 at the rear portion of the block member 32. The first dog member 70 is attached to the block member 32.
A first rear cover 67 that covers the rear side of the vehicle and a first rear cover 67
And an annular first outer peripheral side cover 63 projecting to cover the rear outer peripheral side of the cylinder body in close proximity to the outer peripheral portion of the first piston 41 over the entire stroke range. A first dog 64 for detecting the stroke of the first piston 41 is provided in the portion. An operating rod 66 is axially penetrated through the jaws 65 of the block member 32 and the partition wall member 36, the front end of which is the first piston 41 and the rear end of which is the first piston.
The dog members 63 are respectively coupled to the first rear cover 67. As a result, the first dog 64 is integrally movably connected to the first piston 41 via the operating rod 66, and the front and rear stroke ends of the first piston 41 are provided corresponding to the position of the first dog 64. It is detected by the pair of proximity switches 35. Further, the annular second outer peripheral side cover 68 of the second dog member 71 covers the entire stroke range of the second piston 43.
A pair of proximity switches, which are movably fitted to the front end of the second dog 69, and have front and rear stroke ends of the second piston 43 based on the position of the second dog 69. 72a.
A clearance is provided between the dog 64 and the dog 69 so that a finger is not caught.

In the stroke detecting device for the rotary cylinder of the second embodiment constructed as described above, the pressurized fluid is supplied to the piston chambers 38, 39 by the distributor 47, the pistons 41, 43 are driven, and the dog member is formed. 70 and 71 move integrally with the pistons 41 and 43, and the pistons 41 and 43
The stroke ends before and after are detected by the proximity switches 35 and 72a based on the positions of the dogs 64 and 69. Outer peripheral side cover 6 of each dog member 70, 71
Even if the pistons 41 and 43 move to the front and rear stroke ends 3, 68, the first dog member 70 and the cylinder main body 3
Since it covers the gap between the rear side of the first dog member 71 and the rear side of the second dog member 71 and the rear side of the first dog member 71, a finger or the like is not caught in the gap, and thus the safety is high.

Next, a third embodiment will be described. FIG. 4 shows a multi-rotating cylinder in which a large-diameter piston chamber 74 and a small-diameter piston chamber 75 having different diameters are provided in a double manner in a cylinder main body 72 by a partition member 73 so that their axial positions overlap. A first piston 76 is accommodated in the large-diameter piston chamber 74, a second piston 77 is accommodated in the small-diameter piston chamber 75, and a front end of an operating rod 66 penetrating to the rear side of the cylinder body 72 is coupled to the first piston 76. A dog member 15 that covers the rear side of the cylinder body 72 similar to that of the first embodiment is coupled to the rear end. Similarly to the first embodiment, a distributor 79 is rotatably mounted on the outer periphery of a shaft portion 78 protruding from the rear side of the cylinder body 72. The distributor 79 is provided with a proximity switch 13, The stroke end of the first piston 76 is detected by the movement of 19.

The embodiments of the present invention will be collectively described below. (1) A partition member is provided at the rear of the cylinder body to enter the piston, a distributor is provided in the partition member, and the partition is connected to the piston in the outer space of the distributor and is movable integrally with the piston in the axial direction. A dog member is provided and the dog member is provided.
Stroke detection device for the rotating cylinder described. (2) The stroke detection device for a rotary cylinder according to claim 1, wherein the cylinder body is a multiple rotary cylinder in which a plurality of piston chambers are provided on the same axis and the pistons are housed in the respective piston chambers.

[0019]

As described above, in the stroke detecting device for a rotary cylinder of the present invention, the dog member connected to the piston and moving integrally covers the rear side of the cylinder body and the outer peripheral side of the rear portion at all times. high. Further, since the dog is integrally provided with the dog member configured as described above, the number of parts is smaller and the structure is simple compared to the case where a cover is separately attached to the conventional stroke detection device.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of a rotary cylinder equipped with a stroke detection device of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a vertical cross-sectional view of another embodiment.

FIG. 4 is a longitudinal sectional view of another embodiment.

FIG. 5 is a vertical cross-sectional view of a rotary cylinder equipped with a conventional stroke detection device.

[Explanation of symbols]

2,31,72 Cylinder body, 5,38,39,7
4,75 Piston chamber, 6,41,43,76,77
Piston, 8,78 Shaft part, 10,47,79 Distributor, 15,70,71 Dog member, 16,34 Stroke detection device, 17,51,67 Rear cover,
18, 63, 68 Outer peripheral side cover, 19, 64, 69
Dog

Claims (2)

[Claims] 1. A rotary cylinder in which a piston chamber having an axis of rotation as an axis is provided in a cylinder body, and the piston is slidably fitted in the piston chamber in the axial direction. A dog member that is connected and synchronized with the piston and that can move integrally in the axial direction is provided, and this dog member covers the rear side of the cylinder main body and the outer circumference of the rear cover covers the entire stroke range of the piston. Stroke detection device for a rotary cylinder, which is configured by a ring-shaped outer peripheral cover that is provided so as to cover the rear outer peripheral side of the cylinder body closely, and the dog member is provided with a dog for piston stroke detection. . 2. A shaft portion having the same axis line is projected from the rear side of the cylinder body, a distributor is disposed on the outer circumference of the shaft part, and is connected to a piston in the space on the outer peripheral side of the distributor to axial direction. The stroke device for a rotary cylinder according to claim 1, wherein a dog member that is movable integrally with the piston is provided.