JPH0159053B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention involves inserting a thread into a hole at the proximal end of an eyeless suture needle, and then pressing and deforming the outer diameter of the proximal end of the suture needle to attach and fix the thread to the needle. The present invention relates to a crimping device for threads with needles.

<Prior art> Regarding this type of caulking device or caulking mold, the present inventor has already developed various structures as shown in Japanese Patent Publications No. 56-43420, No. 57-10646, No. 57-56412, etc. These products have been developed and put into practical use in Japan.

Conventional devices such as those mentioned above are similar to electric sewing machines, in which a foot switch is stepped on to rotate a motor and a cam to rotate a cam, which activates a caulking mold from the top and bottom to caulk the needle. In this case, it is difficult to control the rotation of the cam, and therefore it is impossible to stop the cam accurately at a predetermined position. I was letting it happen.

<Problem to be solved by the invention> Therefore, in the conventional device of this kind, even if a mistake is made in the operation, the device cannot be stopped midway, and the position of the needle inserted into the caulking mold cannot be changed. Since it cannot be reworked, there are drawbacks such as the production of defective products or the destruction of the caulking mold.

<Means for Solving the Problems> The present invention is a technology developed in view of these conventional inconveniences. In particular, a switching cam is attached to the cam shaft of a cam, and the rotation of the cam is controlled by this switching cam. The present invention aims to provide a completely new needle thread caulking device which makes it possible to control the cam and thereby stop the cam at a required predetermined position in an accurate and stable state. The above is a needle thread crimping device that opens and closes a crimping mold by rotating a cam to swage and attach thread to a needle, and includes an electric motor and a brake attached to a cam shaft of the cam, and an electric motor and a brake attached to the cam shaft of the cam; A switching cam that is attached to a shaft and has a signal generation section at a predetermined position, and a signal conversion section that is provided adjacent to the switching cam and engages with the signal generation section of the switching cam to generate a signal. The electric motor and the brake are controlled in accordance with the signal from the signal converter.

<Function> In the present invention, a switching cam is attached to the cam shaft of a crimping device that can open and close a crimping mold by rotating a cam to swage and attach a thread to a needle, and the switching A signal converting section is provided adjacent to the cam, and the switching cam is configured to periodically generate a signal by engaging the signal generating section of the switching cam with the signal converting section. Since the electric motor and the brake are controlled by the signal, if the timing at which this signal is generated coincides with, for example, the position where the needle is inserted into the caulking mold and the position where the needle is next rotated for caulking, the above-mentioned It is possible to stop the cam precisely at these positions and permanently until the next signal is sent. Therefore, even if the work procedure is incorrect, it is possible to sufficiently prevent the occurrence of defective products and prevent caulking. It is possible to prevent damage to the mold.

<Example> A device for caulking and attaching a thread to a needle by rotating a cam to open and close a caulking die, which is a prerequisite for the device according to the present invention, is shown in FIGS. 6 and 7, for example. That's right. The device shown in FIGS. 6 and 7 is a publicly known technology described in Japanese Patent Publication No. 57-56412, for which the patent applicant has already acquired the rights, so its configuration can be briefly described as follows. .

That is, in FIGS. 6 and 7, 1 is a frame, 2 is a swinging arm that swings around a horizontal pin 3, 4 is a ram, 5 and 6 are caulking type upper and lower molds, respectively.
Reference numeral 8 denotes a connecting arm, which connects the ram 4 to the swing arm via pins 7 and 9. 10 is Ram 4
Pins 11 and 12 provided at the lower end of the swing arm 2 are springs, and 14 is a receiving block, which are pivotally connected to the swing arm 2 via a pin 13. Reference numeral 15 denotes a pedestal, which is supported by an arm 15b and a spring 16. 17 is a cam follower roller pivotally attached to the lower end of the pedestal 15; 18 is a cam pivotally attached to the camshaft 19; 20 is a spring receiver; 21 is a screw;
2 is a spring, and 23 is a pointer.

In the device shown in these figures, the roller 17 is connected to the cam 1.
By moving up and down with the rotation of the arm 8, the pedestal 15 and the receiving block 14 are raised and lowered, thereby swinging the swinging arm 2, and moving the swinging arm 2 through the connecting arm 8, the ram 4, and the pin 10. The upper mold 5 is moved up and down using the upper mold 5, and the base end of a needle (not shown) inserted between the lower mold 6 and the lower mold 6 can be caulked.

Therefore, the position A1 of the cam 18 relative to the roller 17
is the state where the upper and lower molds 5 and 6 are open, and this position is the position where the needle with the thread inserted into the base end hole is inserted into the upper and lower molds 5 and 6, and the position A2 of the cam 18 is the position where the needle is inserted into the lower mold. 6, position A3 of the cam 18 is the position for caulking work, position A4 is the position for rotating the needle by 90 degrees during the temporary holding state, and position A5 is the position for the second crimping operation, and A6 is the thread tension test position before returning to the original open position, ie, the A1 position.

While the cam 18 is rotated once from A1 to A6, the base end of the needle inserted into the upper and lower dies 5 and 6 is caulked twice, and the thread inserted into the hole at the base end of the needle is completely attached. Fixed.

Next, to show a specific example of the device of the present invention, as shown in FIGS.
A switching cam 25 having a hole therein is rotatably mounted on the cam shaft 19 of the above-mentioned device, and a micro switch 26 is operated by engaging this switching cam 25 with the recess 24 to generate a signal.
are provided adjacent to each other, and further a motor M is provided on the camshaft 19.
It is constructed by attaching a brake 27.

In the above embodiment, the switching cam 25 having the recess 24 formed in the outer periphery was explained.
As shown in FIG. 3, this switching cam is a switching cam 2 having a convex portion 24a protruding from its outer periphery.
5a, or one made of plastic with a metal plate embedded in a predetermined width on the outer peripheral surface (not shown), etc. can be used.

Furthermore, the positions of the concave portions 24 and convex portions 24a provided on these switching cams 25, 25a are positions for stopping the cam 18 (cam shaft 19), and are similar to, for example, the position A1 of the cam 18 in the description of the above-mentioned device. This is the position where the needle corresponding to A4 of the cam 18 is inserted into the upper and lower molds 5 and 6, or the position where the needle corresponding to position A4 of the cam 18 is rotated by 90 degrees. Therefore, by appropriately setting the above-mentioned concave portion 24, convex portion 24a, etc., position A2 can be adjusted.
The cam 18 can also be stopped at position A6 (to check the position of the needle), position A6 (to test by pulling the thread from the needle), etc.

FIG. 4A shows an embodiment of the circuit used in the device of the present invention, in which when the foot switch 28 is not connected, the B contact of the relay R is connected to the brake 2.
Since the cam 18 is connected to the cam 7, the cam 18 is stopped. Furthermore, if the foot switch 28 is kept depressed, the motor M continues to rotate regardless of the switching cam 25, but if the foot switch 28 is turned OFF, the micro switch 26 signal is generated at the next switching cam 25 signal position. In response to this signal, it is possible to release the self-holding state of the relay R, turn off the power to the motor M, and at the same time energize the brake 27 to accurately stop the cam 18 at a predetermined position.

In the device according to the present invention, a switching cam 25 having a signal generating section is mounted coaxially with the cam 18, and a micro switch 26 serving as a signal converting section is provided adjacent to the switching cam 25. Since the motor M and the brake 27 are controlled by the signals from the micro switch 26, when the protrusions of the micro switch 26 touch the concave portion 24, the convex portion 24a, etc. of the switching cam 25, the signal is transmitted from the switch 26. This signal allows the cam 18 to be stopped at an accurate position via the camshaft 19.
Therefore, by regulating the timing at which the cam 18 is stopped, the upper and lower needle types 5, 6 as described above can be adjusted.
The operation of the upper mold 5 can be stopped during desired operations such as insertion into the needle or rotation of the needle. Furthermore, this stop can be stopped permanently by stepping on the foot switch 28 or the like until the next signal is sent.
During this time, it is possible to carry out predetermined operations such as checking the position of the needle and adjusting the position with sufficient time.

If necessary, it is also possible to use a keep relay or the like to wire the foot switch 28 so that it always stops at the next signal position even if the foot switch 28 is continued to be depressed, as shown in FIG. 4B.

In carrying out the present invention, as shown in FIG.
Two switching cams 25 are mounted in parallel on the cam shaft 19 on which the cam 18 is mounted, and micro switches 26 are configured adjacent to each of these cams 25 to switch them as necessary. It is also possible to use the switch 29 by changing it.

The brake 27 may be an electromagnetic mechanical brake or an electronic brake that generates reverse rotational force in the motor, and may be separated from the motor or integrated therewith.

<Effects of the Invention> Since the present device has the structure and operation as described above, by using the present invention, the cam can be stopped reliably and at an accurate position, and thereby the cam can be stopped at a predetermined position. The caulking mold can be reliably stopped during caulking work, making the caulking work easier, preventing the occurrence of defective products, and further preventing the caulking mold from being destroyed, making it easy for even unskilled workers to do. It has features such as being easy to work with.

[Brief explanation of drawings]

Fig. 1 is a side view of the main parts of this device, Fig. 2 is a front view of the main parts, Fig. 3 is an explanatory diagram of another example, Fig. 4 is an explanatory diagram of the circuit, and Fig. 5 is an explanation of another example. 6 and 7 are explanatory diagrams of conventional examples. 2 is a swinging arm, 5 and 6 are upper and lower types, 14 is a receiving block, 15 is a cradle, 17 is a roller, 18 is a cam, 19 is a cam shaft, 25 is a switching cam, 2
6 is a micro switch, 27 is a brake, 28,
29 is a switch.

Claims (1)

[Claims] 1. In a needle thread caulking device that opens and closes a caulking mold by rotating a cam and caulks and attaches thread to a needle, an electric motor and a brake attached to the cam shaft of the cam, and an electric motor and a brake attached to the cam shaft of the cam; a switching cam that is attached to the switching cam and has a signal generation section at a predetermined position; and a signal conversion section that is provided adjacent to the switching cam and engages with the signal generation section of the switching cam to generate a signal; A crimping device for a thread with a needle, characterized in that the electric motor and the brake are controlled in accordance with a signal from the signal converter.