JPS6138568Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an eyeless needle crimping device.

To integrally connect a thread to an eyeless needle, that is, a surgical needle, the thread is inserted into a hole opened in the rear end surface of the needle, and then the rear end of the needle is caulked with a pair of press dies. In order to prevent thread breakage or thread coming out, which is usually caused by the strength of crimping,
A tensile test is carried out on each thread. Conventionally, this tensile test was carried out by holding one end of the needle with one hand using a needle holder, which was taken out from between a pair of pressing dies after crimping, and holding the other end with a needle holder. This was done by pulling the thread by hand, which caused damage from grasping the needle.
In many cases, the test results in a defective test, and a considerable amount of effort is required, making the tensile test extremely troublesome.

The present invention was developed in view of the above circumstances, and the purpose is to provide an eyeless needle crimping device that allows the needle to be held by a pair of press dies after crimping when performing a thread tension test. shall be.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 designates a base body of a caulking device that is shown fragmentarily and schematically, and a base end portion (left end portion in the figure) 2a of a swinging arm 2 extending in a substantially horizontal direction is horizontally attached to the base body 1. It is attached via a pin 3 so as to be rotatable clockwise and counterclockwise in the figure. On this base body 1, a ram 4 is held below the base end 2a of the swinging arm 2, and an upper mold 5 is held below the ram 4 so as to be movable up and down. A lower die 6 is fixed at a position below the . A connecting arm 8 is connected to the ram 4 via a pin 7.
The lower end of the connecting arm 8 is rotatably connected to the connecting arm 8.
The upper end portion of the swing arm 2 is rotatably connected to a portion near the base end portion 2a of the swing arm 2 via a pin 9.

Such a ram 4 holds a press pin 10 that can freely come out and retract from its lower end surface, that is, a pressing surface against the upper mold 5, and a preload spring 11 that always biases the press pin 10 downward. Further, the upper die 5 is always urged upward by a linear return spring 12 whose base end is fixed to the base body 1, and the urging force of the return spring 12 is applied to the preload spring 11.
Normally, as shown in FIG. 1, although the upper mold 5 contacts the pressing pin 10, it is spaced apart from the ram 4 by a small distance.

As shown in FIGS. 3 and 5, the facing surfaces of the upper mold 5 and the lower mold 6, that is, the pressing surfaces thereof, are provided with a substantially semicircular caulking opening toward one side of the molds 5 and 6. Grooves 5a, 6a, and locking grooves 5b, 6b that are connected to the caulking grooves 5a, 6a and slope in a substantially semicircular shape that gradually widen toward the other side of both molds 5, 6 are formed. has been done. The widening angles of the locking grooves 5b and 6b, that is, the angle α formed with a line orthogonal to both molds 5 and 6, are both equal, preferably about 7° to 15°.

Next, the operation of the above-mentioned constituent device will be explained.

First, as shown in FIG. 4, one end of the thread 14 is inserted into the hole 13a opened on the rear end surface of the needle 13, and the rear end of the needle 13 is inserted into the lower die 6 (caulking groove 6a) as shown in FIG. ). At this time, the locking grooves 5b, 6
b is located on the tip side of the needle 13. In this state, force is applied to the tip end 2b of the swinging arm 2 in the downward direction in FIG. 2 to push down the ram 4, and the upper mold 5 and lower mold 6 13 is held in a temporary holding state (at this time, the ram 4 does not directly press the upper mold 5). In the temporary holding state, the force between the molds 5 and 6, that is, the force with which the preload spring 11 presses the upper mold 5 via the pressing pin 10, is such that the needle 13 is not deformed at all. In this temporary holding state, it is confirmed that the needle 13 is properly positioned at a predetermined position between both molds 5 and 6, that is, in the caulking grooves 5a and 6a, and the position is corrected if necessary.

Next, a larger force is applied to the swinging arm 2, and the needle 13 is caulked with the pair of dies 5 and 6. This caulking state is shown in FIG. 5, in which the diameter of the needle 13 is deformed at the caulking grooves 5a and 6a of the pair of dies 5 and 6 (this portion is indicated by reference numeral 13b).
As a result, the thread 14 is integrally connected to the needle 13. At the same time, the needle 13 is formed with an inclined deformed portion 13C whose diameter gradually increases from the deformed portion 13b toward its tip due to the locking grooves 5b and 6b.

When the crimping is completed, the force applied to the swing arm 2 is reduced to return to the previously described temporary holding state.
In this temporary holding state, the force applied to the pair of dies 5 and 6 is much smaller than that during crimping, but the positional relationship of each member, upper die 5, lower die 6, needle 13, and thread 14, is the same as in FIG. 5, so that the thread 14 in FIG.
When the needle 13 is pulled to the left, the needle 13 receives a force in the same direction, but the inclined deformed portion 13C of the needle 13 is in the inclined engagement groove 5.
As a result of the inclined deformation portion 13C being locked by the inclined locking grooves 6b, 6b, the movement to the left of FIG. 6 is restricted. Incidentally, the inclined deformation portion 13C is also locked by the inclined locking grooves 6b, 6b at the same time, so that the movement to the left of FIG. 6 is restricted. Therefore, by pulling the thread 14 with a predetermined force as described above, the needle 13
While the wire is held by a pair of dies 5 and 6, it is checked whether the wire is properly fastened, i.e., whether or not the wire breaks or comes loose.

After confirming the quality of caulking by the tensile test of the thread 14, as shown in Fig. 1,
Open it and take out the needle 13 after caulking. Thereafter, it is sufficient to repeat the new caulking operation using the same procedure. The above-described movement of the swing arm 2 is performed using, for example, a cam rotationally driven by a motor. Furthermore, if a tension test is performed on the thread 14 while applying a large force during caulking, the thread will come off and the tension test will be meaningless. Therefore, it must be carried out in a temporarily held state where no large external force is applied.

Furthermore, since the force applied to the thread 14 during the tension test is not so large, there is no risk of damage to the molds 5 and 6, but as shown in FIG. It is preferable to provide the thrust receiving member 15 on the base body 1.

The above description and FIGS. 1 and 2 are one embodiment, and the preload spring 11 is not in the ram 4 but in the lower die 6.
and the base body 1, or may be attached to the connecting arm 8 or the swinging arm 2. That is, the preload spring 11 may be provided in a caulking force transmitting member such as the ram 4, and may have a structure that presses the upper die 5 and the lower die 6 by a certain amount in the direction of mutually closing.

As described above, the present invention allows the needle to be held in a pair of molds when performing a thread tension test, so that the tension test can be easily performed.

In addition, the needle can be held simply by installing a preload spring in the caulking force transmission system of the caulking device and by machining locking grooves on the pressing surfaces of the pair of molds, so it can be implemented easily and inexpensively. .

Furthermore, the locking groove is sloped so that it gradually widens in one direction, so the force when pulling the support is widely distributed and transmitted to the mold, preventing damage due to localized large force. Also, it does not leave any scratches on the needle.

Note that unlike conventional tensile tests, there is no need to hold the needle with a needle holder, so the tensile test can be completed without damaging the needles.

Furthermore, since the present invention performs a tensile test during the caulking operation, the caulking operation becomes reliable and the defective rate is drastically reduced.

[Brief explanation of the drawing]

Figures 1 and 2 are simplified configuration diagrams of the device of the present invention showing different operating states, Figure 3 is an enlarged view of the pair of molds seen from the right side of Figure 5, and Figure 4 is the needle before crimping. Fig. 5 is an enlarged sectional view showing the deformed state of the pair of molds and the needle during crimping, and Fig. 6 is a diagram of the needle, thread, and upper mold as seen in Fig. 2 It is an explanatory diagram showing a relationship. 5, 6...Press mold, 5b, 6b...Latching groove, 1
3...Eyeless needle, 13a...Hole, 14...Thread.

Claims (1)

[Scope of utility model registration request] A thread is inserted into a hole opened in the rear end surface of the eyeless needle, and the rear end of the eyeless needle into which the thread is inserted is caulked with a pair of press molds to integrally connect the eyeless needle and the thread. In the tight caulking device, on each pressing surface of the pair of pressing dies,
A preload spring is provided to press the pair of pressing dies in the closing direction so that the eyeless needle can be temporarily held elastically after crimping by forming an inclined locking groove that gradually widens toward the tip of the eyeless needle. A needle crimping device capable of a tensile test, characterized in that it is installed in a crimping force transmission system such as a ram, etc.