JPS6230115Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an electromagnetic drive mechanism used for the cutter operating shaft of a punching device for a tape puncher, and more specifically, between a pair of upper and lower solenoids in which the SN poles are arranged opposite to each other. This invention relates to an electromagnetic drive mechanism in which a permanent magnet connected to a cutter drive shaft is arranged to be movable up and down, and the cutter drive shaft is driven by the simultaneous attraction and repulsion of the permanent magnet and a pair of solenoids.

Conventionally, electromagnetic drive devices have been known in which an iron core fixed to the tip of an operating shaft of a plunger or the like is arranged so as to be movable up and down around the axis of a solenoid, and the iron core is attracted by the excitation of the solenoid to drive the operating shaft. It is being However, this type of conventional drive device has a structure in which the operating shaft is driven only by the attraction or repulsion between the excited solenoid and the iron core, so the driving force is weak.
Another problem was that the solenoid became large.

Furthermore, there is a lapse of time from when the plunger first moves until the cutter tip hits the target object, so a relatively small force is required at the beginning of the movement, but a strong pressing force is applied when it hits the target object. Ideally, this would be the case, but conventionally, the driving force is uniform from the start of the plunger to drilling, so a large force is required from the beginning. This not only wastes power and increases noise, but also causes problems in that the important pressing force is weakened by the reaction when it hits the object.

This invention was devised to solve the above problems.The purpose of this invention is to have a small size and strong driving force, and also to be able to change the driving force and driving speed depending on the operating time of the operating shaft. The object of the present invention is to provide an electromagnetic drive mechanism that can apply a necessary strength of force over a necessary period of time.

An embodiment of the invention will be described below based on the drawings.

FIG. 1 is a longitudinal cross-sectional view of the electromagnetic drive mechanism of the present invention applied to a cutter for punching a tape puncher. A pair of annular solenoids 2 that are excited by supplying current
a and 2b are arranged concentrically and facing each other with a predetermined interval so that their respective SN poles are oriented in opposite directions. In the illustrated embodiment these solenoids 2
a and 2b are fixed concentrically in the case 1 by being sandwiched between step parts 1a and 1b formed at the upper and lower parts of the case 1 and case lids 1a' and 1b' screwed from the upper and lower parts, respectively. Terminals of the solenoids 2a and 2b are electrically connected to a common power source (not shown) via a circuit 3 to be described later.

Furthermore, inside the case 1 are upper and lower iron cores 4a, 4b.
A plunger 6 having a permanent magnet 5 sandwiched therebetween.
is vertically movable between the solenoids 2a and 2b, and an operating shaft 7 is fixed to one iron core 4b of the plunger 6, passing through the lid 2b on the opposite side and extending to the outside of the case 1. A cutter attachment 8 is connected to the distal end side of the operating shaft 7.

The embodiment shown in the figure is a case where the present invention is applied to the drive mechanism of a drilling device, and in this case, a strong downward pressing force is required in the figure, so the permanent magnet 5 is activated by the excitation of the lower solenoid 2b. The direction of the SN pole is regulated so that it is attracted downward and repelled downward by the excitation of the upper solenoid 2a. 9a and 9b are springs stretched between the upper and lower ends of the plunger 6 and the opposing lids 1a' and 1b', respectively; in the embodiment shown in FIG.
serves as a double return spring for the plunger 6, and the upper spring 9a serves as a buffer spring for the plunger 6. The arrangement of these springs 9a, 9b is not limited to the embodiment shown in FIG. 1; for example, as shown in FIG.
A double return spring 9b and a buffer spring 9a may be provided above and below this spring receiver 9'. However, the double return spring 9b is required for the embodiment in which a + pulse current (〓) is applied to the solenoids 2a and 2b, and when a +-pulse current (〓〓) is applied, the plunger 6 is a solenoid. This is not necessarily necessary since the magnetic forces 2a and 2b operate alternately in both the up and down directions.

The cutter attachment 8 may be directly coupled to the operating shaft 7, or may be coupled via a lever or other transmission mechanism.

In the figure, 10 is a cutter guide, 11 is a processing table, and 12 is a workpiece such as a tape.

3 and 4 are circuit diagrams of the solenoids 2a and 2b used in the embodiment of FIG. 1, and the solenoids 2a and 2b are connected to a common power source via wiring 3a and 3b. A positive pulse current (〓) or a plus/minus pulse current (〓) is supplied from the power supply.
) is transmitted to excite the solenoids 2a and 2b. In the embodiment in which plus and minus pulse currents are transmitted as described above, the double return spring 9b shown in FIGS. 1 and 2 is unnecessary.

Figure 4 shows one solenoid 2 in the circuit diagram of Figure 3.
This is a circuit diagram in which a delay circuit 13 is added to delay the excitation of the plunger 6, and by shifting the timing of the current applied to one solenoid, the driving force and driving speed of the plunger 6 can be adjusted according to the operating time. It was designed to change.
In other words, when perforating a tape, there is a lapse of time from when the cutter starts descending until the tape is perforated, and while a relatively small driving force is required from the time the cutter starts descending until it contacts the tape, there is no resistance at the time of perforation. As the distance increases, a stronger driving force is required. Therefore, the excitation timing of one solenoid (solenoid 2a in the figure) is controlled by the delay circuit 13 so that only one solenoid is energized at the beginning of descent, and both solenoids are energized at the time of drilling to obtain a stronger driving force. has been delayed.

Since this invention has the above configuration, solenoid 2
When current is applied to a and 2b to excite them, a magnetic field is formed at the SN pole of each solenoid 2a and 2b,
In the present invention, a permanent magnet 5 integrated with the operating shaft is vertically movably disposed between the solenoids 2a and 2b with the SN poles arranged in opposite directions. It is sucked by the lower solenoid 2b) and at the same time is repelled by the other solenoid (upper solenoid 2a in the illustrated embodiment) and moves downward in the figure. In this way, the operating shaft 7 is operated by the action of the permanent magnet 5 and the solenoid, and the pair of solenoids simultaneously act on the attraction force and the repulsion force, so that the drive mechanism is not simply driven by the attraction action of the solenoid and the iron core as in the past. It is possible to obtain a driving force that is significantly stronger and faster than that of the conventional method, and when used as a cutter drive mechanism of a tape punching device, for example, work efficiency can be significantly improved.

Furthermore, since the use of permanent magnets increases the driving force, the solenoid can be made relatively smaller, and the entire device can be made smaller and lighter. Furthermore, by shifting the excitation timing of the pair of solenoids, the driving force and speed of the operating shaft can be varied in accordance with the operating time.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of an electromagnetic drive mechanism according to one embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional view of main parts according to another embodiment, and FIGS. 3 and 4 are solenoid excitation circuit diagrams. 1...Case, 2a, 2b...Solenoid, 5
... Permanent magnet, 6 ... Plunger, 7 ... Operating shaft, 8 ... Cutter attachment, 9a, 9b
... Spring, 10 ... Cutter guide, 12 ... Workpiece, 13 ... Delay circuit.

Claims (1)

[Scope of utility model registration request] A pair of solenoids 2a, 2 are arranged above and below inside a case 1 made of non-magnetic material and are excited by an applied voltage.
b are arranged facing each other at a predetermined interval so that their SN poles are opposite to each other, and a plunger 6 with a permanent magnet 5 fixed thereon is fitted between the solenoids 2a and 2b in the case 1 so as to be movable up and down. , a solenoid and an actuating shaft 7 projecting to the outside through the axis of the case lid body are integrally coupled to at least one end side of the plunger 6, and the solenoids 2a and 2b are connected to a common power source via a circuit 3. An electromagnetic drive mechanism characterized in that the circuit 3 is further provided with a delay circuit 13 for delaying excitation of one of the solenoids.