CN100412726C - retrograde display mechanism - Google Patents

Abstract

The retrograde display mechanism according to the invention consists of a star wheel (1) connected to a gear wheel (R2), which has a series of tines, each tine has a flank (B, C, etc.), mounted on a barrel (7) The contact pin (3) presses the tooth side through the pointer (6) and the coil spring (2).

Description

retrograde display mechanism

technical field

The invention belongs to the watch technology, in particular to a retrograde display mechanism.

Background technique

Retrograde display mechanisms known as rack displays are known, which are driven by pinions of short tooth height. This type of rack mechanism includes a rack that rotates on a balance shaft, and the pointer is mounted on the rack. The rack is the larger part, which indicates that this type of mechanism takes up more space in the timepiece. A number of mechanisms are also known consisting of a stylus in contact with a snail. A snail wheel rotates on a balance shaft and connects the hands. The snail is made depending on the information to be displayed, and has a straight line at the end of its travel, allowing the stylus to return to its original position under the action of a spring.

Invention patent content

The object of the present invention is to propose a retrograde display mechanism that occupies a small space and works reliably.

According to the retrograde display mechanism of the present invention, it is characterized in that it includes a star wheel mounted on a toothed reel, and the star wheel is composed of a lot of tines, and a tooth side of each tine presses a The stylus fixed with the pointer, the design of the shape and size of the tooth side depends on the information to be displayed.

In a preferred embodiment, the stylus, pointer and spring are mounted on a barrel rotating on a balance shaft. The mechanism includes a stop pin which, after the stylus has completed its travel along the tine flank of the star wheel, prevents the barrel from receding and falling onto the adjacent flank for another working cycle.

The flanks of the tines of the star wheel have a shape and size that produce a linear display.

Description of drawings

As an example, the attached drawing shows an embodiment of the retrograde display mechanism according to the present invention.

In the attached picture:

Figure 1 shows a top view of the mechanism;

Figure 2 is a cross-section through the balance shaft holding the pointer in the mechanism;

Figure 3 is similar to Figure 1, but its retrograde stylus is at the limit position before the pointer resets, and

Figure 4 is a top view of the reverse planetary gear

Detailed ways

Figures 1 to 4 show a schematic diagram of the display mechanism of the retrograde part. In clocks and watches, this display is used to indicate the watch, which is the power reserve of the long second hand in this example. Its advantage is that it does not jump. Unlike many retrograde measuring mechanisms of the prior art, the pointer is in motion all the time.

This institution includes:

逆行星轮1

Inverse planetary gear 1

卷簧2

coil spring 2

逆行触针3

retrograde stylus 3

卷簧固定销4

Coil spring fixing pin 4

止动销5

stop pin 5

指针6

pointer 6

The retrograde mechanism is driven by gears R1 and R2. Reverse planetary gear 1 is attached to gear R ₂ and has several identical tines, which are evenly spaced around the circumference.

The end of the retrograde contact pin 3 is always in contact with a tine of the counter planetary gear 1 and presses against the tooth side B of this tine. The coil spring 2 keeps this contact constant. A cross-section of the balance shaft A ( FIG. 2 ) shows the mechanism in detail, with the coil spring 2 mounted on the barrel 7 . Similarly, the retrograde contact pin 3 and the pointer 6 are also mounted on the bar case 7 . The barrel can rotate freely on the balance shaft A, and the coil spring fixing pin 4 is used to fix the coil spring 2 .

When working, the retrograde moving object R ₂ rotates clockwise and pushes the tip of the retrograde contact pin 3 through the tooth side B. When this tip reaches the end of its travel (Fig. 3), the flank separates from the stylus and the stylus falls onto the next flank C. This process is repeated on the next flank C. So the pointer is constantly moving. The stop pin 5 acts as a stop pin during the fall. And prevent the end of the retrograde contact pin 3 from falling to the tooth profile bottom of the retrograde planetary gear 1.

The tooth flanks B and C of the tines of the retrograde planetary gear 1 are carefully designed so that the retrograde pointer 6 can move linearly on the dial (not shown).

As shown in FIG. 2 , the coil spring 2 , the retrograde contact pin 3 and the pointer 6 are mounted on the barrel case 7 and fixed at corresponding positions of the barrel case 7 .

The coil spring 2 is tensioned and fixed to the housing of the mechanism by a coil spring fixing pin 4 . As shown in FIG. 1 , the pointer 6 abuts against the stop pin 5 at the beginning of its stroke, and the retrograde contact pin 3 also touches the tine tooth side B of the reverse planetary gear 1 at the beginning of its stroke. The star wheel 1 attached to the gear 2 is driven by the moving body R1 in the direction of the arrow (see Figures 1 and 3), which in turn drives the stylus 3 which follows the tine of the star wheel 1 as the gear R1 turns. Side B movement. The relative position of the pointer 6 and the stylus is fixed, driven by the stylus 3 against the action of the coil spring 2 and pointing out the displayed value on the dial (not shown). When the stylus 3 exceeds the position shown in Fig. 3, the coil spring 2 makes the stylus 3 and the pointer 6 return to their initial positions, close to the stop pin 5, and such a working cycle starts again on the tooth side C of the star wheel 1 .

According to the above-mentioned mechanism shown in Figures 1-4, it can be used to point out various information usually displayed by clocks and watches, such as seconds, minutes, hours, dates, days, months and so on. The moving bodies _R1 and _R2 must have suitable dimensions, and the individual tines of the star wheel 1 are adapted to the values to be displayed.

The advantage of the above device is that it is simple and can be displayed continuously. When the stylus passes a tine of the star wheel, the next working cycle begins and is continuously displayed without interruption.

Claims (2)

1. Retrograde display mechanism, characterized in that it includes: a star wheel (1), attached to a toothed reel, the star wheel consists of a series of tines, each tine has a tooth side (B, C... ), the contact pin (3) fixed with the pointer (6) is close to the tooth side under the action of the coil spring (2), and the shape and size design of the tooth side (B, C...) depends on the information to be displayed; The stop pin (5) is arranged to prevent the barrel (7) from falling backwards under the action of the coil spring (2) after the contact pin has reached the end of its travel on the tooth sides (B, C...). On the next flank of another duty cycle. 2. The mechanism according to claim 1, characterized in that the stylus (3), pointer (6) and coil spring (2) are mounted on a barrel (7) that can rotate on a balance shaft.

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