JPS6130848B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention provides an elastic string-like body having a male threaded portion at one end and a female threaded portion at the other end. This relates to a device that connects in a ring shape by screwing, and for example, a small diameter spring with an outer diameter approximately equal to the inner diameter of the coil spring is integrally connected to one end of a tightly wound coil spring, and this small diameter coil spring is connected to the above-mentioned coil spring. It is screwed into the other end of a tightly wound coil spring and used to manufacture an automobile tire chain band connected in a ring shape.

[Conventional technology]

A device for connecting both ends of an elastic string-like body of this type is already known as described in Japanese Patent Application Laid-Open No. 153287/1987.

[Problem that the invention seeks to solve]

In the above-mentioned conventional example, one end of the elastic string-like body is prevented from rotating between the bottom surface of the groove into which the one end is fitted and a member provided on the entrance side of the groove so as to be able to freely reciprocate linearly. the other end of the elastic string-like body is held between the bottom surface of the groove into which the other end is fitted and a member that is linearly movable back and forth on the entrance side of the groove; The reciprocating movement of the member rotates (twists) the other end of the elastic string. In other words, the other end of the elastic string is held and rotated by means similar to the means for holding one end of the elastic string in a non-rotatable state.

Therefore, it is very difficult to appropriately set the frictional force of the groove bottom surface or the member surface against both ends of the elastic string-like body, and it is difficult to set one end of the elastic string-like body when clamping it in a non-rotating state or when releasing the clamping. At this time, unexpected rotation may occur at one end of the elastic string due to frictional resistance with the member, or when clamping and fixing the other end of the elastic string while rotating due to frictional force with the member, the elastic string may There was a risk that slippage of the shaped body would occur and the number of rotations (amount of twisting) would be insufficient.

An object of the present invention is to eliminate the above-mentioned conventional drawbacks and also to make it possible to easily adjust the number of rotations (amount of twist) of the elastic string-like body.

[Means for solving problems]

In order to achieve the above object, the present invention includes a fixed pawl having a horizontal groove narrowing inward, a pin parallel to the horizontal groove pivotally supported on the fixed pawl, and a protrusion at the free end facing the horizontal groove. A movable claw provided with a piece and a hydraulic cylinder for swinging the movable claw around the pin are provided, and one end of the elastic string-like body is connected to the horizontal groove of the fixed claw and the protrusion of the movable claw. a pair of drive rollers that are interlocked with each other by gears so as to rotate in the circumferential direction in a lateral direction of the first clamping means;
a swinging arm that is swingable around a pin that is parallel to the pin and is provided with an idling roller that faces both of the driving rollers at its free end; and a fluid pressure for swinging the swinging arm around the pin. A cylinder is provided to constitute a second clamping means for clamping the other end of the elastic string between the driving rollers and the idle roller, and the elastic string is reciprocated by a hydraulic cylinder whose expansion and contraction stroke is adjustable. By providing a rack to be moved and a pinion that meshes with the rack, and rotating the drive roller with the pinion,
The other end of the elastic string-like body is configured to be rotationally driven, and the first clamping means is connected to the second clamping means,
It is characterized in that it is provided with a drive means for reciprocating in the lateral direction.

[Effect]

According to the above configuration, one end of the elastic string-like body is held between the horizontal groove of the fixed claw and the protrusion of the movable claw, and the other end of the elastic string-like body is held between both driving rollers and the idle roller. When the rack is moved in one direction, the pinion rotates and drives both drive rollers, so the other end of the elastic string rotates against the elastic restoring force of the elastic string, causing the pinion to rotate. The rack is twisted by an amount commensurate with the number of rotations, that is, the expansion and contraction stroke of the hydraulic cylinder moving the rack.

In this state, the first clamping means is moved toward the second clamping means, and the rack is moved in the opposite direction,
When the pinion is rotated in the opposite direction, the elastic string-like body is unwound by the given amount of twist, and the male and female threaded portions at both ends of the elastic string-like body are screwed together and connected in a ring shape. It turns out.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

Reference numeral 1 denotes a closely wound coil spring which is an example of the aforementioned elastic string-like body, and at one end, a small diameter coil spring 1a which is an example of the aforementioned male threaded portion is integrated with the wire extension portion of the tightly wound coil spring 1. With the plurality of locking fittings 2 for the tire chain inserted into the tightly wound coil spring 1, the small diameter coil spring 1a is inserted into the tightly wound coil spring 1, which is an example of the female threaded portion described above. By screwing it onto the other end 1b and connecting it in a ring shape, it becomes an automobile tire chain band.

A is a first clamping means that clamps the end of the tightly wound coil spring 1 on the side of the small diameter coil spring 1a in a non-rotating state, and includes a fixing claw 4 having a horizontal groove 3 narrowing inward, and a fixing claw 4 having a horizontal groove 3 parallel to the horizontal groove 3. A movable claw 7 is pivotably supported by a pin 5, and has a removably replaceable protrusion 6 attached to the lower end thereof facing the horizontal groove 3.
A hydraulic cylinder (in this embodiment, a pneumatic cylinder (in this embodiment, air pressure is used) is used to swing the movable claw 7 around the pin 5.
The same applies to other cylinders to be described later. ) 8, and is configured to hold the end portion of the small-diameter coil spring 1a in a non-rotating state between the lateral groove 3 that narrows inward and the protruding piece 6 that opposes the lateral groove 3. Movable claw 7
A positioning tool 9 which also serves as a discharge arm is attached to the. A bracket 10 is connected to the fixed claw 4 and supports the fluid pressure cylinder 8 so as to be swingable around a horizontal axis 11.

B is a second clamping means that clamps the other end 1b of the closely wound coil spring 1, and is provided in the lateral direction of the first clamping means A. It is provided in the lateral direction of the second clamping means A. The second clamping means B has gears 27, 28, 2 so as to rotate in the same direction.
A pair of upper and lower drive rollers 1 interlocked and connected at 9
2, 13, and both driving rollers 12, 1 which are swingable around a pin 16 parallel to the pin 5 and at the lower end thereof.
3 and a swinging arm 15 provided with an idle roller 17 facing the
The coil spring 1 is constructed of a fluid pressure cylinder 14 that swings around the coil spring 1, and is configured so that the vicinity of the other end 1b of the tightly wound coil spring 1 is held between the driving rollers 12, 13 and the idle roller 17. Reference numeral 18 denotes a bracket that supports the fluid pressure cylinder 14 so as to be swingable around the axis 19.

C is a drive means for reciprocating the first clamping means A in the lateral direction with respect to the second clamping means B, and specifically, the entire first clamping means A is moved to the device base 20.
The fixing claw 4 of the first clamping means A is connected to the rod 21a of the hydraulic cylinder 21, which is supported on the top so as to be movable in the left and right direction and fixed to the base 20, and the fixing claw 4 is connected to the second clamping means by the rod 21a. It is configured to be pushed toward the B side and returned in the opposite direction by the force of a spring (not shown).

D is a rotational drive means having a rack 23 that is reciprocated left and right by a fluid pressure cylinder 22 and a pinion 24 that meshes with the rack, and transmits forward and reverse rotation of the pinion 24 to the second holding means B. be. That is, the rack 23 is connected to the hydraulic cylinder 2.
The rod 22a is connected to the second rod 22a.
When the rack 23 is pushed and moved through a, the pinion 24 rotates in the normal direction, and the rotational force is applied to the bevel gears 25, 2.
6. When the pinion 24 is transmitted to the gears 27, 28, 29 to rotate the drive rollers 12, 13 in the forward direction, and the rod 22a retreats to move the rack 23 in the opposite direction, the pinion 24 is reversed and the drive rollers 12, 13 are rotated in the forward direction. 13 is reversed. LS ₁ and LS ₂ are limit switches that control the pressure fluid to the fluid pressure cylinder 22, and are operated by operating pieces 30 protruding from the side of the rack 23.
It is operated by an operating piece 31 detachably attached to the tip of the rack 23, and is configured to define the expansion and contraction stroke of the hydraulic cylinder 22, that is, the reciprocating stroke of the rack 23.
By replacing the operating piece 31 with one of a different thickness, the expansion and contraction stroke of the hydraulic cylinder 22, that is, the reciprocating stroke of the rack 23, can be adjusted.

Next, the effect of the above configuration will be explained.

First, open the movable claw 7 and open the idle roller 1.
7 is separated from the drive rollers 12 and 13,
One end of the tightly wound coil spring 1 is pressed against the horizontal groove 3 of the fixed claw 4, and the other end is pressed between the drive rollers 12 and 13. In this case, as shown in FIGS. 3 and 4, since the movable claw 7 is in the open position, the positioning tool 9
is an extension of the horizontal groove 3 (this is an extension of the drive roller 1
It is also an extension of the gap formed between 2 and 13. ), therefore, the small diameter coil spring 1 formed at one end of the tightly wound coil spring 1
a and the other end 1 of the tightly wound coil spring 1
b can be brought into contact with both side surfaces of the positioning tool 9 to define the position in the left-right direction.

Thereafter, the hydraulic cylinders 8 and 14 are shortened, and one end of the tightly wound coil spring 1 is held between the horizontal groove 3 of the fixed pawl 4 and the protrusion 6 of the movable pawl 7, and the other end is held by the drive roller 12. , 13 and an idle roller 17. In this case, Figures 5 and 6
As shown in the figure, when the movable claw 7 swings toward the fixed claw 4, the positioning tool 9 is also displaced in the same direction. Get out of between 1b.

In this state, when the hydraulic cylinder 22 is extended and the rack 23 is pushed, one end of the tightly wound coil spring 1 is prevented from rotating;
Since rotational force is transmitted to the other end by friction transmission from the drive rollers 12 and 13, the tightly wound coil spring 1 is given twist (elastic deformation) in the direction of unwinding the coil. The amount of twist (the number of rotations in the coil unwinding direction) is given according to the number of rotations of the pinion 24, in other words, the movement stroke of the rack 23, so the amount of twist is always constant, even if the coil is tightly wound. Even if you change the thickness of the spring 1, the number of turns (length in the axial direction) of the small diameter coil spring 1a, etc., you can easily replace the operation piece 31 with one of an appropriate thickness.
An appropriate twist amount can be set by simply adjusting the movement stroke (the expansion/contraction stroke of the fluid pressure cylinder 22).

Next, the fluid pressure cylinder 21 is operated to extend,
At the same time, the small-diameter coil spring 1a held by the first holding means A is moved straight toward the second holding means B side, that is, the other end 1b side of the tightly wound coil spring 1, and at the same time, the hydraulic cylinder 22 is operated to shorten. 23, when the other end 1b of the tightly wound coil spring 1 is reversed through the pinion 24, etc., the small diameter coil spring 1a becomes the tightly wound coil spring 1.
It is screwed into the other end 1b and connected in a ring shape. In this case, the forward rotation speed of the pinion 24 due to the forward movement of the rack 23 always matches the reverse rotation speed of the pinion 24 due to the backward movement of the rack 23, so
The tightly wound coil spring 1 is always unwound by the amount of torsion imparted as the pinion 24 rotates in the normal direction, thus preventing the product connected in a ring shape (tire chain band) from twisting. Ru.

Then, by extending the hydraulic cylinders 8 and 14 again, the product is released from being held by the first and second holding means A and B. In this case, by swinging the movable claw 7 to the open position,
The positioning tool 9, which is integral with the movable claw 7, returns to its original position, so that the product is placed in the positioning tool 9 as shown in FIG.
It will be kicked forward and automatically released. Therefore, no manual work is required to take the product out of the device.

In the above embodiment, only the tightly wound coil spring 1 was described, but as shown in FIG.
The present invention can also be applied to the case where rubber strings 1' having a circular cross section in which b' is embedded are connected in a ring shape. Therefore, the present invention is applicable to endless rubber belts, annular packing bands, in addition to automobile tire chain bands. It is also possible to implement the same manufacturing technology.

〔Effect of the invention〕

Since the present invention has the above-described configuration, it has the following effects.

Because one end of the elastic string-like body is held between the narrowing horizontal groove formed on the fixed claw and the protrusion of the movable claw that opposes this, unnecessary rotational force is applied to the elastic string-like body during clamping and cleaning. Moreover, the clamping is reliable, and when the other end of the elastic string-like body is twisted, no slip occurs at one end of the elastic string-like body.

At the other end of the elastic string, the other end of the elastic string is held between a pair of driving rollers and an idling roller opposing the pair of driving rollers, and in this state, the driving roller is driven to rotate. Since rotation (twisting) is imparted to the other end of the elastic string, the greater the frictional force of each roller against the elastic string, the less slippage occurs at the other end of the elastic string, and the more the elastic string is held. Both rotation (application of twist) are performed reliably, and the setting of the frictional force is easy.

Therefore, when screwing together the male threaded portion and the female threaded portion at both ends of the elastic string, it is necessary to give the elastic string the amount of twist, whether too much or too little, and be sure to twist by the given amount of twist. This prevents the screw fitting between the male threaded part and the female threaded part from becoming insufficient, and the entire ring-shaped connected product from being twisted.

The amount of twist imparted to the elastic string can be adjusted simply by adjusting the expansion and contraction stroke of the hydraulic cylinder that reciprocates the rack.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a plan view, FIG. 2 is a perspective view of essential parts, FIGS. 3 to 7 are operational views, and FIG. 8 is another example of an elastic string-like body. FIG. A...First clamping means, B...Second clamping means, 3
... Horizontal groove, 4 ... Fixed claw, 5, 16 ... Pin, 6
... Projection piece, 7 ... Movable claw, 8, 14, 22 ... Fluid pressure cylinder, 12, 13 ... Drive roller,
15... Swinging arm, 17... Idle roller, 2
3...Rack, 24...Pinion.

Claims (1)

[Claims] 1 A device for connecting an elastic string-like body having a male threaded portion at one end and a female threaded portion at the other end in a ring shape by screwing both the threaded portions together, a fixed pawl 4 having a horizontal groove 3; and a movable pawl 7, which is pivotably supported on the fixed pawl 4 by a pin 5 parallel to the horizontal groove 3, and has a protrusion 6 facing the horizontal groove 3 at its free end. and a fluid pressure cylinder 8 for swinging the movable claw 7 around the pin 5, one end of the elastic string-like body is connected to the lateral groove 3 of the fixed claw 4 and the protrusion 6 of the movable claw 7. A pair of driving rollers 12 are interlocked with each other by gears in the lateral direction of the first clamping means A to rotate in the same direction.
13, and both drive rollers 12, 1 are swingable around a pin 16 parallel to the pin 5 and are provided at free ends.
3 and a swinging arm 15 provided with an idle roller 17 facing the
A fluid pressure cylinder 14 for swinging the elastic string body is provided to constitute a second clamping means B that clamps the other end of the elastic string body between the driving rollers 12, 13 and the idle roller 17. A rack 23 that is reciprocated by a hydraulic cylinder 22 whose expansion and contraction stroke can be adjusted and a pinion 24 that meshes with the rack are provided, and the pinion 24 drives the drive rollers 12 and 13 to rotate. configured to rotate the other end of the elastic string-like body,
the first clamping means A to the second clamping means B;
A device for connecting both ends of an elastic string-like body, which is provided with a drive means for reciprocating the body in the lateral direction.