JPS623233Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanism for bringing a recording needle into contact with a rotating drum in a mimeograph paper making machine.

Conventionally, a mechanism as shown in FIG. 1 has been adopted as this type of mechanism. In FIG. 1, A is a recording needle, which is detachably attached to a needle shaft C rotatably supported by a bearing B. D points to the needle axis C as the recording needle A.
A coil spring is stored so as to contact the rotating drum with a predetermined pressure, E is an arm rod fixed to the end of the needle shaft C, and F is rotatably supported at the center by a support shaft G. It is an L-shaped lever, and one end F' receives and supports the arm rod E, and the other end F'' supports the solenoid H.
It is connected to the operating rod Ha. I is the lever F
A coil spring is used to give the recording needle A a tendency to rotate in the direction in which it should normally move away from the rotating drum. J is a rotating drum, and K is a scanning table.

Next, the operating mode will be explained. Solenoid H
When the actuating rod Ha is retracted by energizing, the lever F rotates counterclockwise in the figure with the support shaft G as a fulcrum. As a result, the arm lever E is no longer supported by the lever F, and the restoring force of the coil spring D causes the needle shaft C to rotate. Then, the recording needle A comes into contact with the rotating drum J due to the contact pressure generated by the coil spring D. On the other hand, when the power to the solenoid H is stopped, the coil spring I causes the lever F to return to its original position, that is, to the position where it pushes up and supports the arm lever E, and the contact of the recording needle A with the rotating drum J is stopped. It is something.

However, in such a mechanism, the lever F is rotated by a solenoid H, and since the solenoid is activated rapidly at the same time as energization, the support of the arm lever E by the lever F may suddenly come off. Therefore, the contact of the recording needle A with the rotating drum J is carried out with great force, which tends to lead to accidents such as bending of the recording needle. Note that the faster the rotating drum rotates, the greater the impact force upon contact.

In view of the above-mentioned points, the present invention has been devised to improve the above-mentioned drawbacks of the conventional mechanism by making it possible for the recording needle to come into contact with the rotating drum without any force.

Hereinafter, the present invention will be described in more detail with reference to illustrated embodiments.

In FIG. 2, 1 is a recording needle, and 2 is the recording needle 1.
The needle shaft is removably attached to the needle shaft, and is rotatably supported on a bearing 4 erected on the scanning table 3. 5 is a coil spring stored in force so that the recording needle 1 contacts the rotating drum with a predetermined pressure, and 6 is an arm rod fixed to the end of the needle shaft 2. This is the same as the conventional mechanism. Further, reference numeral 7 denotes a guide plate erected on the scanning table 3, in which an arcuate sliding guide groove 8 is bored and a stopper pin 9 is installed. The stopper pin 9 determines the position of the needle shaft 2 when the plate making is stopped. Reference numeral 10 denotes a motor whose rotating shaft 10a is oriented in the same direction as the needle axis 2. In this embodiment, a synchronous motor whose rotational speed is set to an appropriate value by gears is used. The rotational speed is set to a value that does not cause an impactful contact when the recording needle 1 comes into contact with the rotating drum rotating at high speed. 11 is the scanning table 3
This is a motor support frame installed vertically. Reference numeral 12 denotes a lever whose base is fixed to the rotating shaft 10a of the motor 10, and an arm rod 12a that passes through the sliding guide groove 8 of the guide plate is implanted at the tip end.
Note that the lever 12 is parallel to the arm rod 6 and
a is provided to be perpendicular to the arm rod 6. 1
3 fits the intermediate part into the rotating shaft 10a of the motor,
One end is attached to the motor support frame 11, and the other end is attached to the lever 1.
This is a coil spring that engages with the lever 12 to return the lever 12 to its original position and to reversely rotate the rotating shaft 10a of the motor.

The other 14 indicates a rotating drum.

Next, the operation mode of the present invention having the above configuration will be explained.

When the motor 10 is driven, a lever 12 fixed to its rotating shaft 10a rotates. This lever 12
Simultaneously with the rotation, the arm rod 12a installed therein also rotates along the sliding guide groove 8 of the guide plate 7. At this time, the arm rod 6 of the needle shaft 2 is connected to the arm rod 1 of the lever 12.
Since the recording needle 1 mounted on the needle shaft 2 rotates at the required speed while being supported by the needle 2a,
The contact is made gradually, and the contact is not made in an impactful manner as in the past. When the motor 10 reaches an appropriately set rotation angle (when the recording needle comes into contact with the rotating drum), the motor 10 is braked and power is applied to hold the motor 10 at that position until the end of plate making. . More specifically, since the rotation angle of a synchronous motor is determined by the energization time and the driving power frequency, the rotation angle is controlled by controlling the energization time of the motor, and the rotation angle is set after the set energization time. The drive AC power source is rectified to generate a holding force on the motor to hold its position. Also, at the same time that the recording needle contacts the rotating drum 14, the arm rod 12a and the arm rod 6
After the contact is completed, the recording needle 1 continues to be in contact with the rotating drum 14 by the coil spring 5 at a pressure suitable for the plate-making operation.

Also, when the plate-making operation is completed, the motor 10
The applied power of coil spring 1 is cut off, and as a result, coil spring 1
Due to the restoring force of 3, the rotary shaft 10a of the motor rotates in the opposite direction, and the lever 12 returns to its original position.Thereby, the needle shaft 2 is also rotated, and the recording needle 1 is returned to its original position.

Since the present invention has the above-described structure and operation, the recording needle does not come into contact with the rotating drum as violently as in the past, and there is no risk of the recording needle being bent or bent. It is also possible to prevent plate-making errors caused by breakage, etc.
It has been put to practical use and is highly effective.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional mechanism, and FIG. 2 is an explanatory diagram of the proposed mechanism. 1...Recording needle, 2...Needle shaft, 3...Scanning table, 4
... Bearing, 5 ... Coil spring, 6 ... Arm rod, 7 ...
... Guide plate, 8 ... Sliding guide groove, 9 ... Stopper pin, 10 ... Motor, 12 ... Lever, 13
...Coil spring.

Claims (1)

[Scope of utility model registration request] A recording needle 1 is removably attached to a needle shaft 2 which is rotatably supported with a bearing 4 mounted upright on a scanning table 3, and the needle shaft 2 is rotated with a required pressure using a coil spring 5. In a mechanism for contacting a recording needle with a rotating drum, the rotating shaft 10a is energized to contact the drum, and an arm rod 6 for rotating the needle is fixed to the end of the needle shaft 2. The base of a lever 12 is fixed to the rotating shaft 10a of the motor 10, and an arm 12a is provided at the tip of the lever 12 to extend in a direction perpendicular to the arm 6 of the needle shaft. 10 rotating shafts 10
A is provided with a return coil spring 13 that reversely rotates the rotating shaft at the same time as the motor stops, and a guide plate 7 is provided between the needle shaft 2 and the motor 10, and the arm of the lever 12 is attached to the guide plate 7. A mimeograph paper characterized in that an arc-shaped sliding guide groove 8 through which a rod 12a passes is bored, and a stopper pin 9 is implanted to determine the position of the needle shaft 2 when the plate-making is stopped and abuts on the arm rod 16. A mechanism for contacting the recording needle with the rotating drum in a plate-making machine.