JPH0977376A - Bobbin gripping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the durability of a diaphragm in a bobbin gripping device in which a movable gripping member is reciprocated by utilizing the diaphragm and an energizing means. SOLUTION: A gripping frame body 3 consisting of a supporting member 5 and a main body 6 is fixed on the front face of a supporting base 2, and a fluid pressure introducing member 11 is fixed on the inside of the base end of the supporting member 5 while clamping a diaphragm 13. A bobbin insertion hole 7a and a bobbin inlet hole 7b are formed in the main body 6, while guide holes 9, 10 are formed in the supporting member 5 and the main body 6. A movable gripping member 16, which is constructed of a piston 17, a gripping piece 18 projected from the piston 17, and locking pieces 19a, 19b positioned on both sides of the gripping piece 18, is arranged slidingly along the guide holes 9, 10 and is energized to the release position side by means of a coil spring 20. If locking parts 21 formed in the locking pieces 19a, 19b are engaged with a stepped part 9a in the guide hole 9, the movable gripping member 16 is prevented from moving toward the release position side so as to be kept in non-contact condition with the diaphragm 13 on which no fluid pressure acts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bobbin gripping device, which is installed in an automatic doffer of a spinning machine and used for pulling out and inserting a bobbin, and more specifically, a movable gripping member is arranged at a gripping position by the action of fluid pressure. The present invention relates to a bobbin gripping device that returns from a gripping position to a release position by a biasing means.

[0002]

2. Description of the Related Art As a bobbin gripping device of this type, for example, a device shown in FIG. 6 has been proposed in Japanese Utility Model Laid-Open No. Sho 49-127515. In this device, a grip frame body 31 is fixed to the front surface of a support base 30, and a bobbin insertion hole 32 is formed at the tip of the grip frame body 31. A fixed gripping member 33 is provided on the front side of the gripping frame body 31 with the bobbin insertion hole 32 interposed therebetween. A diaphragm 35 is fitted and fixed between the support base 30 and the inside of the base end of the grip frame 31 via a current plate 34. A movable gripping member 36 is disposed on the front side of the diaphragm 35 so as to be slidable in the front-rear direction along the inner surface of the gripping frame 31 and the tip of the movable gripping member 36 can project into the bobbin insertion hole 32.
The movable gripping member 36 has a pressure receiving portion 37 formed at the base end thereof, and the spring 3 interposed between the pressure receiving portion 37 and the gripping frame 31.
The tip end is urged by 8 in the direction of retreating from the bobbin insertion hole 32, and the pressure receiving portion 37 is always held in contact with the diaphragm 35. The rectifying plate 3 is provided on the support 30.
A communication hole 39 is formed at a position corresponding to the hole 34a formed at the center of 4. Then, the pressure fluid (compressed air) is passed through the conduit 40 connected to the pressure fluid supply source.
When acts on the diaphragm 35 via the communication hole 39 and the hole 34a, the diaphragm 35 moves the movable gripping member 36 in the projecting direction, and the bobbin B is gripped by the fixed gripping member 33 and the movable gripping member 36. When the action of the pressure fluid on the diaphragm 35 is released, the spring 38
The movable gripping member 36 is placed in the release position by the urging force of, and the bobbin B is released. There is also a configuration in which the diaphragm 35 is disposed in a state of contacting the support base 30 without providing the flow straightening plate 34, and the pressure fluid acts directly on the diaphragm from the communication hole formed in the support base 30 (for example, , Japanese Utility Model Publication No. 55-117459).

[0003]

In the conventional device, when the movable gripping member 36 is arranged in the retracted position, the pressure receiving portion 37 of the movable gripping member 36 causes the diaphragm 35 to move to the straightening plate 34 by the urging force of the spring 38. It is kept pressed. The time for which the bobbin gripping device is in the bobbin releasing state is longer than the time for which the bobbin gripping state is in the bobbin gripping state.
It was in a state of being sandwiched between the rectifying plate 34 and. Also,
When the bobbin is released and the movable gripping member 36 returns to the released position, the pressure receiving portion 37 collides with the flow straightening plate 34 via the diaphragm 35, and the diaphragm 35 is impacted. Since the diaphragm 35 is generally made of rubber,
There is a problem in that the durability is lowered by being held in a sandwiched state for a long period of time or repeatedly receiving an impact.

The present invention has been made in view of the above problems, and an object thereof is to improve the durability of a diaphragm in a bobbin gripping device which reciprocates a movable gripping member by utilizing a diaphragm and a biasing means. It is to provide a bobbin gripping device that can be made to operate.

[0005]

In order to achieve the above object, the invention according to claim 1 is provided with a movable gripping member arranged so as to be reciprocable between a gripping position and a releasing position, A bobbin gripping device for urging a movable gripping member toward a release position by a biasing means, and moving the movable gripping member from a release position to a gripping position by gripping a bobbin by applying a fluid pressure to the movable gripping member through a diaphragm. ,
Contact preventing means is provided for preventing the movable gripping member from contacting the diaphragm in a state where the fluid pressure is not applied, in a state where the movable gripping member is arranged at the release position by the biasing force of the biasing means.

Further, in the invention as set forth in claim 2, the movable gripping member is slidably arranged along a guide portion formed on the grip frame, and the contact blocking means is movable together with the guide portion. It is composed of a locking portion and a locked portion provided between the member and the member.

According to a third aspect of the present invention, in the second aspect of the present invention, the locked portion is an elongated hole formed in the movable grip member so as to extend along the moving direction thereof. The locking portion is a pin fixed to the grip frame side in a state of being fitted into the elongated hole.

In the invention described in claims 1 to 3, the movable gripping member is reciprocally disposed between the gripping position and the releasing position, and is biased toward the releasing position by the biasing means. Further, fluid pressure acts on the movable grip member via the diaphragm, and the movable grip member is moved from the release position to the grip position against the biasing force of the biasing means. The movable gripping member is prevented from coming into contact with the diaphragm in the state where the fluid pressure is not applied by the action of the contact blocking means in the state where the movable gripping member is arranged in the release position. Therefore, in the released state, the diaphragm does not receive the pressing force of the movable grip member. Also,
When the movable grip member moves from the grip position to the release position, the movable grip member does not collide with the diaphragm.

According to the second aspect of the invention, the movable gripping member slides along a guide portion formed on the gripping frame.
Then, due to the action of the locking portion and the locked portion provided between the guide portion and the movable gripping member, the movable gripping member comes into contact with the diaphragm in the state where the fluid pressure is not applied in the bobbin released state. Is blocked.

Further, in the invention described in claim 3, in the invention described in claim 2, the pin fixed to the holding frame side functions as a locking portion. The pin is fitted into a long hole formed in the movable grip member so as to extend along the moving direction, and when the movable grip member is placed in the release position, the pin engages with one end of the long hole to move toward the diaphragm side. Is prevented from moving.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment in which the present invention is embodied in a bobbin holding device for two weights will be described below with reference to FIGS. The bobbin holding device 1 is used by being fixed to the front surface of a support base 2 fixed to a machine frame such as an auto doffer. As shown in FIGS. 2 and 3, the gripping frame body 3 for the two weights is fixed to the front surface of the support base 2 with screws 4 at predetermined intervals. As shown in FIG. 1 and FIG. 2, the grip frame 3 is a support base 2
The support member 5 is fixed to the support member 5, and the main body 6 is detachably attached to the support member 5. The main body 6 is fixed to the support member 5 by fitting the lock projections 6a formed on the inner side thereof into the lock grooves 5a formed on the upper and lower sides of the outer surface of the support member 5, and the main body 6 is subjected to an unreasonable external force. When the force acts, the support member 5 is disengaged. In the main body 6, a bobbin insertion hole 7a into which the top of the bobbin B is inserted and a trumpet-shaped introduction port 7b are continuously formed vertically. On the side of the bobbin insertion hole 7a of the main body 6 facing the support member 5, a fixed gripping member 8 is fixed so as to slightly project into the bobbin insertion hole 7a. The fixed grip member 8 is formed of a material having a large frictional resistance (for example, urethane rubber). Guide holes 9 and 10 are formed in the support member 5 and the main body 6 at positions facing the fixed gripping member 8 as guide portions extending in a direction orthogonal to the bobbin insertion hole 7a.

As shown in FIGS. 1 and 2, the fluid pressure transfer member 11 is fitted and fixed at a position corresponding to the inside of the base end of the support member 5, and the space between the support member 5 and the fluid pressure transfer member 11 is fixed. The housing portion 12 is formed in the. A diaphragm 13 is arranged between the support member 5 and the fluid pressure transfer member 11. The diaphragm 13 is formed so as to be curved along a recess 11a formed on the front side of the fluid pressure transfer member 11, and is sandwiched between the support member 5 and the fluid pressure transfer member 11 at its peripheral edge. Fluid pressure transfer member 1
A passage 14 extending along the longitudinal direction of the support base 2 is formed in the support base 1, and a communication hole 15 communicating with the passage 14 is formed so as to open at a position corresponding to the diaphragm 13. The pressure of the compressed air as the pressure fluid acts on the back surface of the diaphragm 13 through the communication hole 15.

The movable gripping member 16 has a piston 17 accommodated in the accommodating portion 12, a gripping piece 18 projecting from the center of the piston 17, and the piston 17 so as to sandwich the gripping piece 18.
It is composed of locking pieces 19a, 19b protruding from. The movable gripping member 16 is integrally formed of resin. The movable gripping member 16 includes both locking pieces 19a, 1a.
The gripping position in which 9b is slidable along the guide hole 9 and the tip of the gripping piece 18 is slidable along the guide hole 10, and the tip of the gripping piece 18 projects into the bobbin insertion hole 7a. And a releasable position retracted into the guide hole 10 are reciprocable. The movable gripping member 16 is biased toward the release position by a coil spring 20 as a biasing means interposed between the support member 5 and the piston 17.

A locking portion 21 is provided on the tip side of both the locking pieces 19a and 19b so as to project on the side opposite to the side facing the gripping piece 18. On the front side of the guide hole 9, there is a stepped portion 9a as a locked portion.
Is formed, and the movable gripping member 16 is held at the release position in a state where the locking portion 21 is engaged with the step portion 9a. In this state, if the fluid pressure does not act on the diaphragm 13, the piston 17 is held in a state where it does not come into contact with the diaphragm 13, that is, a state where a gap δ exists between the piston 17 and the diaphragm 13. Locking part 21
And the step portion 9a constitutes a contact prevention means. Locking piece 19
When a and 19b are inserted into the guide hole 9, they are bent toward the gripping piece 18 side so that the locking portion 21 can enter the guide hole 9.

Next, the operation of the bobbin holding device 1 constructed as described above will be described. The passage 14 of the bobbin holding device 1 is connected to an air compressor or the like as a pressure fluid source via a connecting pipe 22 (shown in FIGS. 2 and 3) and a pipe,
Compressed air is supplied / exhausted by a valve (neither is shown) provided in the middle of the pipeline. Then, when the compressed air does not act on the diaphragm 13, the movable gripping member 16 is held by the biasing force of the coil spring 20 at the release position where the tip of the gripping piece 18 is recessed in the guide hole 10, as shown in FIG. To be done. At this time, the locking portion 21 engages with the step portion 9, and the piston 17 is positioned at a position separated from the diaphragm 13. The diaphragm 13 has its own shape-retaining force so that the concave portion 1 of the fluid pressure transfer member 11 can be retained.
It is held in its original position along 1a.

In this state, the support base 2 is lowered and the top of the bobbin B is loosely inserted into the bobbin insertion hole 7a of the grip frame 3 located above the bobbin B. Next, compressed air is connected pipe 22
And the like, and is supplied to the passage 14 of each fluid pressure transmission member 11, and the pressure acts on the diaphragm 13 via the communication hole 15. As a result, the diaphragm 13 becomes the coil spring 2.
The movable gripping member 16 is pressed and moved against the biasing force of zero. Then, the movable gripping member 16 moves to a position where the tip of the gripping piece 18 projects into the bobbin insertion hole 7a, and the fixed gripping member 8 and the gripping piece 18 grip the top of the bobbin B.

When the support base 2 is raised in this state, the bobbin B is raised together with the support base 2 while being held by the two holding members 8 and 16. Further, when the supply of the compressed air to the fluid pressure transfer member 11 is stopped and the pressure of the compressed air does not act on the diaphragm 13, the diaphragm 13 returns to its original position by its elasticity. In addition, the movable grip member 1
6 is moved to the release position side by the urging force of the coil spring 20, and the grip of the bobbin B is released. When the movable grip member 16 is moved to the release position side, both locking pieces 19a, 19b
Slides along the guide hole 9 and reaches the release position, the locking portion 21 engages with the stepped portion 9a, and the movement of the movable gripping member 16 is blocked. As a result, the movable gripping member 16 is held at a position where the piston 17 does not contact the diaphragm 13 in the original position. That is, unlike the conventional device, when the movable gripping member 16 returns to the release position, the movable gripping member 16 does not collide with the diaphragm 13 on the fluid pressure transfer member 11. Further, the diaphragm 13 is not strongly sandwiched between the fluid pressure transfer member 11 and the movable grip member 16.

This embodiment has the following effects. (A) The movable gripping member 16 is brought into contact with the diaphragm 13 in a state where the fluid pressure is not applied, because the locking portion 21 engages with the step portion 9a in the state where the movable gripping member 16 is arranged at the release position. Since it is blocked, the diaphragm 13 does not receive the pressing force of the movable gripping member 16 in the released state. In addition, the movable grip member 1 is moved from the grip position to the release position.
When the 6 moves, the movable gripping member 16 moves the diaphragm 13
It does not collide with. As a result, the durability of the diaphragm 13 is improved, the replacement cycle of the diaphragm 13 is extended, and the labor of maintenance work is reduced.

(B) The movable gripping member 16 is positioned at the released position by the engaging portion 21 formed on the engaging pieces 19a, 19b and the step portion 9a engaged with the tip end side of the guide hole 9.
Therefore, it is possible to reliably prevent the movable gripping member 16 from coming into contact with the diaphragm 13 in a state where no fluid pressure is applied, with a relatively simple configuration.

(C) The gripping frame body 3 has the support member 5 and the main body 6
When the body 6 is subjected to an excessive force, the engaging projection 6a of the body 6 is disengaged from the engaging groove 5a of the support member 5, so that the body 6 is damaged by the excessive force. Being avoided.

The present invention is not limited to the above embodiment, but may be embodied as follows, for example. (1) Instead of the combination of the engagement portion 21 formed on the engagement pieces 19a and 19b and the stepped portion 9a of the guide hole 9 as the contact prevention means, as shown in FIG. 24
The combination of and may be adopted. That is, the locking pieces 19a, 1
The gripping piece 18 is formed to have a constant thickness from the base end to the tip without providing the movable gripping member 16 near the tip of the gripping piece 18.
The elongated hole 24 as a locked portion that defines the movement range of the movable gripping member 16 is formed so as to extend along the moving direction of the movable gripping member 16. Further, on the support member 5 side, that is, on the guide portion side, a pin 23 as a locking portion is fitted and fixed to the support member 5 in a state of penetrating the guide hole 9 and the elongated hole 24. The elongated hole 24 is formed at a position where the piston 17 does not come into contact with the diaphragm 13 when the end of the elongated hole 24 is engaged with the pin 23 and the movement of the movable grip member 16 is blocked. In this configuration, the locking pieces 19a, 19
Since it is not necessary to form b, the shape of the movable gripping member 16 is simplified, and the manufacturing of the movable gripping member 16 is facilitated. The pin 23 may be inserted into the long hole 24 without penetrating the long hole 24.

(2) As shown in FIG. 5, the support member 5 is formed with a guide groove 25 as a locked portion which communicates with the guide hole 9 and extends along the moving direction of the movable gripping member 16 to form a gripping piece. The pin 23 is fixed to the hole 26 formed in the hole 18 so that both ends of the pin 23 project into the guide groove 25. In this case, when the pin 23 engages with the end of the guide groove 25, the movable gripping member 16 is held in the release position where the piston 17 does not come into contact with the diaphragm 13. Also in this case, the locking piece 19
Since it is not necessary to form a and 19b, the shape of the movable gripping member 16 becomes simple, and the manufacturing of the movable gripping member 16 becomes easy. The guide groove 25 may be formed only on one side.

(3) In (2), the support member 5 may have a shape in which the front side of the end of the guide groove 25 is deleted, and the pin 23 may come into contact with the front end of the support member 5 to restrict movement. Good. Since the movable gripping member 16 moves by being guided by the guide hole 9, there is no problem even if there is no portion for guiding the pin 23. In this case, the structure of the support member 5 also becomes simple.

(4) It is possible to provide only one of the locking pieces 19a and 19b and increase the thickness of the gripping piece 18 on the side where the locking pieces are omitted. (5) The support member 5 and the piston 17 serve as contact prevention means.
A rope of a specified length is provided between the and.

(6) A material having a large frictional resistance (eg, rubber) may be joined and fixed to the tip of the gripping piece 18. In this case, the bobbin B is prevented from slipping when the bobbin B is gripped and pulled up from the spindle.

(7) The bobbin insertion hole 7 is provided without providing the fixed holding member 8 made of a material having a large frictional resistance on the holding frame body 3.
The bobbin B may be gripped by the wall surface of the movable gripping member 16 and the movable gripping member 16.

(8) The supporting member 5 and the main body 6 may be integrally formed as the grip frame 3, or the present invention may be applied not only to the bobbin gripping device for two spindles but also to the bobbin gripping device for one spindle. The inventions other than those described in the claims that can be grasped from the embodiment and the modified examples will be described below together with their effects.

(1) In the invention described in claim 2,
The locking portion is a pin projecting from the movable gripping member, and the locked portion engages with the pin when the movable gripping member is placed at the release position to prevent the movable gripping member from moving toward the diaphragm. It is a part of the gripping frame at the position. in this case,
The structure of the movable grip member is simplified.

[0029]

As described above in detail, according to the inventions of claims 1 to 3, in the bobbin gripping device for reciprocating the movable gripping member by utilizing the diaphragm and the urging means, The durability can be improved.

In the invention described in claims 2 and 3,
The structure of the contact prevention means is simplified.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment.

FIG. 2 is a plan sectional view.

FIG. 3 is a partially cutaway front view.

FIG. 4 is a cross-sectional view of a modified example.

FIG. 5 is a cross-sectional view of another modification.

FIG. 6 is a sectional view of a conventional device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Bobbin holding device, 3 ... Holding frame body, 9, 10 ... Guide hole as a guide part, 9a ... Step part as a locked part, 13
... diaphragm, 16 ... movable holding member, 20 ... coil spring as biasing means, 21 ... locking portion, 23 ... pin as locking portion, 24 ... elongated hole as locked portion.

Claims (3)

[Claims] 1. A movable gripping member disposed so as to reciprocate between a gripping position and a release position, wherein the movable gripping member is biased toward the release position by biasing means, and the movable gripping member is provided. In a bobbin gripping device that grips a bobbin by moving a fluid pressure from a release position to a gripping position by a diaphragm, a state in which the movable gripping member is placed in the release position by the urging force of the urging means. A bobbin gripping device provided with contact blocking means for blocking the movable gripping member from coming into contact with the diaphragm in a state where no fluid pressure is applied. 2. The movable grip member is slidably arranged along a guide portion formed on the grip frame, and the contact blocking means is provided between the guide portion and the movable grip member. The bobbin holding device according to claim 1, wherein the bobbin holding device is configured by a stop portion and a locked portion. 3. The locked portion is an elongated hole formed in the movable grip member so as to extend along the moving direction thereof.
The bobbin holding device according to claim 2, wherein the locking portion is a pin fixed to the holding frame body side while being fitted into the elongated hole.