JPH025972Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a printing device in which endless belts are arranged in parallel. The present invention relates to a printing device with an improved belt circulation prevention mechanism.

In a parallel endless belt type printing device, endless printing belts are stretched parallel to each other between a plurality of parallel rotating wheels and a stamping base, and a through hole is provided in the center of each rotating wheel. A common support shaft is inserted through the support shaft to support each rotating ring, and this support shaft is further displaced in the parallel direction of the rotating wheels to select the desired rotating ring, and then the support shaft is rotated. A desired rotary wheel is driven by the action of a locking pin protruding from the rotary wheel, and an endless belt extending over the rotary wheel is displaced as a result of the action of the locking pin.

In such a printing device, it is important that the printing plates arranged on the belt are successively positioned correctly directly below the stamping base as the rotary wheel rotates. As a top mechanism, for example, as shown in Japanese Patent Publication No. 56-232, small holes are arranged in a row at positions corresponding to each rotating ring on a support that abuts the outer periphery of each rotating ring, and minute holes are inserted into each small hole. Insert a coil spring, and place a small steel ball on top of each spring.
A series of small grooves corresponding to the number of printing plates were arranged on the outer periphery of each rotating ring, and a click stop effect was obtained by pairing these small grooves with the above-mentioned small steel balls. Alternatively, it is also known that the paired click stop mechanisms are provided between the outer periphery of the central support shaft and the inner periphery of each rotating ring.

However, the click stop mechanism
Since small steel balls and micro coil springs are interposed between the stationary part and the rotating part, it requires time and skill to assemble, and it is difficult to handle, such as scattering during repair and disassembly. .

On the other hand, each endless belt has printing plates lined up along one half of its circumference, and readable characters corresponding to each of the printing plates are lined up on the other half of the belt. However, in order to prevent the read characters from getting dirty with ink pads, circulation is blocked just before the stamp board.The means for preventing the circulation is that a protrusion protruding from the back side of the belt is used to pass the stamp board. It is well known that the vehicle is blocked from moving forward by running into it.

However, since the belt is made of rubber and can be easily stretched, as the above process is repeated, the belt stretches and its tightness weakens, causing the printing plate to become loose with respect to the printing substrate, resulting in instability during printing. It was hot.

The first purpose of the present invention is to eliminate the first disadvantage mentioned above and create a printing device equipped with a click-stop mechanism that is extremely simple, requires no effort to assemble, repair or disassemble, and is easy to handle. The goal is to provide the following information.

The second purpose of the present invention is to create and provide a printing device equipped with a circulation prevention mechanism that eliminates the second disadvantage mentioned above and ensures stable printing without ever causing belt sagging. It is to be.

The structure of this invention is that a stand is installed in the center between a pair of side frames, and a leaf spring is planted from the stand toward one side of each rotating wheel, while a plurality of recesses are installed on one side of each rotating wheel. a click stop mechanism arranged in rows so that a protrusion provided on the free end of the leaf spring engages with the recess;
The rotation prevention mechanism includes a stopper projecting from one side of each of the rotating wheels so that the stopper comes into contact with a side edge of the leaf spring to prevent rotation of the rotating wheels.

The configuration of this invention will be described in detail below with reference to figures and specific examples thereof.

First, a conventionally known configuration will be explained in detail.

A pair of side frames 3 and 4 are installed oppositely at a predetermined interval, and a plurality of rotating wheels 5, 5, 5... are installed in parallel at one end between the frames, while a stamping base 6 is installed at the other end. is constructed, and a plurality of endless belts 7, 7, 7, .

On the surface of each belt 7, 7, 7..., a printing plate 7a... is printed between half the circumference A-A, and a reading character 7b... is printed between the other half circumference B-B. Rack-shaped teeth 7c... are arranged in rows on the back surface, and on the other hand, outer grooves 5a, 5a..., which engage with the teeth 7c, are carved on the outer periphery of the rotating ring 5. 5 is transmitted to the belt 7.

A through hole of the same diameter is bored in the center of each rotary ring 5, and a common support shaft 8 is inserted through the hole, and the ends of the shaft are fixed to the frames 3 and 4. However, in order to enable expansion and contraction in the axial direction, the common support shaft 8 is made of a cylinder, and an operating shaft 9 is placed inside it.
is inserted, and its operating shaft 9 can be displaced in the axial and circumferential directions by means of a grip 9a provided at its outer end.

One pin 10 protrudes from the operating shaft, and a slit 11 for protruding the pin is cut in the axial direction of the circumferential surface of the cylindrical support shaft 8.
A plurality of inner grooves 5b are lined up on the inner circumferential surface of...
The alignment of the inner grooves 5b allows the pin 10 to be displaced in the axial direction, thus making it possible to selectively select each rotating wheel. is driven to rotate, and its rotating ring is rotated by the inner groove 5b that engages with the pin 10. 12 is a guide plate for preventing belt slippage.

Next, the new configuration based on this invention will be described in detail below.

By making the outer periphery of each rotating ring thinner than the boss, an extra gap 13 is formed between each rotating ring, and the swing width of the free end of the leaf spring (described later) is determined by this extra gap. This is made possible by 13.

A stand 14 is installed in the center between the pair of side frames 3 and 4, and leaf springs 15, 15, . . .
..., a plurality of recesses 16, 16, . establish.

Therefore, when the rotating wheel 5 rotates, the protrusion 1 is formed in the recess 16.
Each time the leaf springs 7 engage, a small clicking sound is heard and positioning is achieved, and when further rotation is forced, the protrusion 17 comes off from the recess 16 due to the force, and the free end of the leaf spring moves into the remaining space. 13, and upon arrival of the next recess 16, the protrusion 1 is moved into it.
7 is fitted into engagement, and correct printing positioning of the next printing plate is achieved.

Next, on one side of each rotating wheel 5, 5..., there is a
There is a protrusion 18 at only one location within 360 degrees, and when the rotary wheel rotates and the protrusion 18 comes into contact with the side edge of the leaf spring 15, the rotation of the rotary wheel is prevented, and therefore the circulation of the belt 7 is also restrained. be done.

Therefore, if the position of this protrusion 18 and the boundary between the printing plate part 7a of the belt 7 and the reading character 7b are related as shown in FIG. reach is prevented.

As detailed above, in the present invention, the click stop mechanism includes a protrusion 17 provided at the free end of the leaf springs 15, 15, one end of which is fixed to the base 14, and a rotary ring 5, 5. Since we have created a structure in which the recesses 16, 16, etc. lined up on one side are engaged, the mechanism is not only simple, but also replaces the conventional structure in which small steel balls are elastically mounted with small coil springs, which are easily scattered. Compared to conventional products, it takes much less time to assemble, repair and disassemble, it does not scatter, so there is no need to replenish parts, its functions are stable, so it can withstand long-term use, and its production costs are low. be.

Further, as a means for preventing the half circumference B-B side of the belt 7 from going around the stamp base 6, a protrusion 18 is provided on one side of the rotary ring 5, and a leaf spring 15 is provided on one side of the rotary ring 5.
Compared to conventional products that have protrusions on the rubber belt, the rubber belt does not stretch even with the above repetition, eliminating the risk of unstable printing, which can last for a long time. , smooth austerity was now maintained.

[Brief explanation of the drawing]

1 is a vertical right side view taken along line 1-1 in FIG. 2, and FIG. 2 is a vertical front view taken along line 2-2 in FIG. 1. 3 and 4... side frame, 5, 5, 5...
Rotating ring, 5a... Outer groove, 5b... Inner groove, 6... Stamp base, 7, 7, 7... Endless belt, 7a
... Stamp plate, 7b ... Characters for reading, 7c ... Rack-shaped teeth, 8 ... Cylindrical support shaft, 9 ... Operation shaft, 9a ...
...Grip, 10...Pin, 11...Slit,
12... Guide plate, 13... Extra gap, 14... Stand,
15, 15, 15...leaf spring, 16,
16... recess, 17... protrusion, 18... protrusion.

Claims (1)

[Claims for Utility Model Registration] A pair of side frames, a plurality of rotating wheels arranged in parallel at one end between the frames, a stamping base installed at the other end between the frames, and the base and the plurality of rotating wheels installed at the other end between the frames. It is spanned parallel to the rotating wheel, and printing plates are arranged in rows around half of it.
A plurality of endless belts with readable characters lined up on the other half, a common spindle inserted through a through hole provided in the center of each of the rotating wheels, a pin protruding from the spindle, and each rotation. By pairing with a plurality of inner grooves arranged in a row on the inner circumferential surface of the ring, the pin can be freely displaced in the parallel direction of each rotating wheel, and a rotating wheel can be selected in which power is transmitted only by displacement in the rotational direction. a uniform sorting drive mechanism; a power transmission mechanism to the belt through engagement between a plurality of outer grooves arranged in a row on the outer peripheral surface of each of the rotating wheels and rack-shaped teeth arranged in a row on the back surface of the belt; In the printing device equipped with the above, a space provided between each of the rotating wheels is formed by making the wall thickness of the outer circumferential portion of each of the rotating wheels thinner than the wall thickness of the boss portion of each of the rotating wheels, and a space provided in the center between the pair of side frames. a base, a leaf spring planted from the base toward one side of each of the rotating wheels, and a plurality of recesses carved in one side of each of the rotating wheels;
a projection provided on the free end of each of the leaf springs so as to engage with the recess; A printing device equipped with a protrusion for preventing rotation of the belt in contact with the belt.