JPH0335554Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a printing hammer device used in a type printer.

(Prior Art) For example, in a MICR or OCR printer, a hammer device as shown in FIG. 6 is generally used.

This device consists of a hammer A that reciprocates using the rear part as a pivot point based on a printing command, and a plunger E that is struck by the rear part B of the hammer A and strikes the type in front. The plunger E is inserted into the through hole D of the receiving body C together with the spring G and reciprocates, but a certain amount of mass is required to efficiently apply the striking force. For this reason, the plunger E is usually made of metal, and a chip F made of, for example, nylon resin is fixed to the tip of the plunger E so as to soften the impact with the type and to sufficiently transfer the ink to the paper.

(Problems to be solved by the invention) Therefore, in the conventional hammer device of this type, when the tip F wears out due to long-term use and it becomes necessary to replace it, the following points can be solved. have a problem

That is, first, since the tip F is integrated with the plunger E, the plunger E must be made and replaced as it is, which is uneconomical.

In addition, since the plunger E is inserted into the through hole D of the receiver C fixed between the hammer A and the type, in order to replace it, the plunger E is inserted into the through hole D of the receiver C fixed between the hammer A and the type. The body C or the hammer A must be removed each time, and the replacement work is troublesome.

Furthermore, since the plunger E is inserted into the through hole D together with the spring G, when the hammer A etc. is removed, the plunger E will pop out from the through hole D due to the biasing force of the spring G and fall out, making it difficult to replace it. It can take an unexpected amount of time.

Furthermore, according to the above conventional hammer device, the printing stroke must be adjusted depending on the positional relationship between the receiver C and the plunger E and the positional relationship between the receiver C and the hammer A. extremely difficult.

In view of these points, the present invention has been designed to make it easier and faster to replace the parts that contact the type when they wear out and need to be replaced, and to reduce the number of parts to be replaced to the minimum necessary. It is an object of the present invention to provide a printing hammer device that allows printing strokes to be easily adjusted.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention has a solenoid that moves a plunger forward and backward based on a printing command, and is arranged so that the tip of the plunger is closely opposed to the printing surface. A groove is formed on the axial circumference of the plunger at a predetermined position, and the outer circumference of the plunger including this groove is shaped like a part of a cylindrical member cut out along its length. A body part that has a locking part that is locked at the front end and can be elastically fitted from the radial direction of the plunger, and a body part that is made of a synthetic resin material and is formed at the tip of the body part and covers the tip of the plunger. The device is characterized by a removably attached hammer tip, which includes a cap for striking type.

(Function) In the hammer device of the present invention, the hammer chip, which is equipped with a cap portion for striking type, is easily installed by simply fitting the body portion into the outer periphery of the plunger of the solenoid from the radial direction.

Since the attached hammer tip has a locking portion locked to the front end of the groove of the plunger, it will not shift in position in the axial direction or come off even if the plunger reciprocates at high speed. Therefore, as long as the solenoid is positioned and fixed relative to the type,
Accurate printing stroke adjustment can be easily performed by adjusting the set thickness of the cap portion of the hammer tip.

If the cap of the hammer tip becomes worn out and needs to be replaced, the hammer tip can be easily removed from the plunger by pinching the body with your fingers and lifting it.

(Example) The present invention will be described in detail below based on the illustrated example.

Figures 1 to 5 show a hammer device according to an embodiment of the present invention, and reference numeral 1 in the figure is a solenoid disposed facing the printing type in the printer body, and a plunger 2 is activated based on a printing command. Move forward and backward.
The location of the solenoid 1 is such that when a hammer tip 3, which will be described later, is attached, the cap portion 5 at the tip of the tip collides with the surface of the type 7 with a moderate striking force when the plunger 2 moves forward. If the hammer tip 3 is not attached, the plunger 2 is set at a close position so that it does not come into contact with the surface of the type 7 even if the plunger 2 moves forward. Therefore, even if the solenoid 1 is operated by mistake when the hammer tip 3 is not attached, the type 7 will not be damaged by the tip of the plunger 2.

Further, a continuous groove portion 2a is formed on the axial circumference of the plunger 2 at a predetermined position.

Reference numeral 3 denotes the above-mentioned hammer chip integrally molded from a synthetic resin material, which is shaped like a cylindrical member having an inner diameter that is approximately the same as the outer diameter of the plunger 2 of the solenoid 1, with a part of the radial direction cut out along the axial direction. A body 4 having a shape, provided at the tip of this body 4,
The cap part 5 covers the tip of the plunger 2 and has a striking surface 5a for hitting the surface of the type 7.

The body portion 4 is formed to have a length extending from the tip of the plunger 2 to cover the groove portion 2a, and cut portions 6, 6 are provided at both ends in the front-rear direction for expanding both sides. The portion 4 extending from the rear notch 6 to the rear end constitutes an inward protrusion that engages with the front end of the groove 2a.

The synthetic resin forming the hammer tip 3 is
As with conventional chips, chips are used that have the necessary softness to blend well with the surface of the type when it collides with it and to ensure that the type is transferred to paper via ink from an ink ribbon (not shown). Further, in the figure, reference numeral 7 indicates printed characters, and reference numeral 8 indicates a paper guide member provided in the main body of the printer.

Therefore, when using it, use hammer tip 3.
Pinch the body 4 of the solenoid 1 with your fingers, cover the tip of the plunger 2 of the solenoid 1 with the cap part 5, engage the inward protrusion 4a with the groove 2a, and insert the open lower end of the body 4 into the plunger 2 above it. When pushed in, the lower end of the body 4 of the hammer tip 3 is once pressed against the outer periphery of the plunger 2 and expanded, and then elastically returns to fit around the shaft of the plunger 2.
Of course, the hammer tip 3 can also be attached from any other direction as long as it is in the radial direction of the axial circumference of the plunger 2.

In this state, when the solenoid 1 receives a printing command and operates, the plunger 2 and the hammer tip 3 move forward, and the cap portion 5 of the hammer tip 3 moves forward.
The striking surface 5a of is made to collide with a predetermined type through the paper and the ink ribbon. Printing is performed by repeating this process, and the hammer tip 3
Since a is engaged with the groove 2a, the plunger 2 will not be misaligned in the axial direction.
No blurring occurs in the printing stroke. Furthermore, since the mass of the plunger 2 of the solenoid 1 is added when the type collides with the type, printing can be performed with an appropriate striking force.

When it becomes necessary to replace the hammer tip 3 due to wear on the striking surface 5a of the cap section 5, the hammer tip 3 can be easily replaced by pinching the body section 4 with your fingers and removing it in the radial direction, contrary to the operation described above. is removed from plunger 2. Therefore, at the time of replacement, only the synthetic resin hammer tip 3 needs to be replaced, resulting in lower cost than before.

In the above-mentioned embodiment, the body and the cap of the hammer tip were integrally molded from a synthetic resin material, but the present invention is not limited thereto. While the cap portion may be made of a thin metal material, only the cap portion may be made of synthetic resin.

(Effects) As described above, according to the present invention, the solenoid plunger that operates based on the printing command has
The cap part that covers the tip of the plunger is made of a synthetic resin and is removably fitted from the radial direction of the plunger, so that the type is struck by the tip of the cap part. When the striking surface wears out, it is only necessary to replace the hammer tip, and an inexpensive printing hammer device can be provided.

In addition, the replacement work can be done by simply attaching and detaching the hammer tip from the plunger in its radial direction.
Moreover, unlike the conventional case, there is no need to take into consideration the possibility of the spring protruding due to the urging force of the spring, so the work can be carried out easily and in a short time.

Further, according to the present invention, when the hammer tip is installed, the locking portion provided on the body of the hammer tip is locked to the front end of the groove of the plunger, so that the hammer tip does not shift in front of the axis of the plunger. There is no blurring of type strokes. As a result, the stroke during printing can be reliably determined by setting the stroke of the plunger and the thickness of the cap portion of the hammer tip, making it easier to adjust the printing stroke than in the past.

[Brief explanation of the drawing]

Fig. 1 is a side view of a device according to an embodiment of the present invention, Fig. 2 is an overall perspective view of a hammer tip used in this device, Fig. 3 is a side view of the same chip, and Fig. 4 is a front view of the same chip. 5 are rear views of the same chip, and FIG. 6 is an explanatory diagram showing a conventional example. In the figure, 1 is a solenoid, 2 is a plunger,
2a is a groove part, 3 is a hammer tip, 4 is a body part, 5
5a is a striking surface, 6 is a notch, and 7 is a typeface.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A solenoid for causing a plunger to advance and retreat based on a printing command is arranged so that the tip of the plunger faces closely to the type surface, and the solenoid is disposed on the shaft circumference at a predetermined position of the plunger. A groove is formed, and on the outer periphery of the plunger including the groove, a locking portion is formed in the shape of a part of a cylindrical member cut out along its length and is locked at the front end of the groove. and a body part that can be elastically fitted from the radial direction of the plunger, and a type-beating cap part made of a synthetic resin material and formed at the tip of the body part and covering the tip of the plunger. A printing hammer device characterized by a removably attached hammer chip. (2) The printing hammer device according to claim 1, wherein the body portion and the cap portion of the hammer tip are integrally molded from a synthetic resin material. (3) A request for utility model registration in which the hammer tip is characterized in that the body portion is formed of a member such as a thin, springy metal material, and the cap portion is formed of a synthetic resin material. range 1
Hammer device for printing as described in section.