JPH0110662Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a return-to-zero counter equipped with a swingable support frame that pivotally supports a carry pinion.

Conventionally, in this type of zero return type counter, when the character wheel is returned to zero, the character wheel and the pinion are moved by swinging a support frame that pivotally supports the carry pinion that drives the character wheel. When the pinion is disengaged from the pinion, the boss portion of the pinion comes into contact with a fixedly arranged regulating spring to align the pinion. A return spring attached to the swing shaft of the support frame moves the support frame in the thrust direction with respect to the swing shaft between the support frame and the frame, which swings the support frame so as to press the pinion into engagement with the dial wheel. This was accomplished by pressing the support frame into contact with the reference surface of the frame. For this reason, when assembling the return spring, it is necessary to compress the return spring while assembling, resulting in troublesome assembly and high cost. In addition, the dimensional accuracy of positioning the support frame is determined by the relatively large dimension of the entire width of the support frame, so it has been difficult to accurately manage it. Furthermore, when attempting to rationalize the assembly by using a leaf spring as the return spring, there is a problem in that there is no means for positioning the support frame in the thrust direction.

In view of the above points, the present invention provides a zero return type counter in which the position of the support frame in the thrust direction is determined by engagement between an engaging part provided on the support frame and an engaging part provided on the frame. The purpose is to

The purpose of this is to provide a zero-return type counter equipped with a swingable support frame that pivotally supports a carry pinion, and the first engaging portion fixedly disposed on the support frame and the zero-return operation. A second member fixedly disposed on the frame of the counter and capable of engaging with the first engaging portion over the entire range of movement of the first engaging portion in conjunction with the swinging of the support frame at the time of the movement of the first engaging portion. a second engaging portion;
A zero return type characterized in that the engagement between the first engagement part and the second engagement part allows the support frame to swing but prevents the support frame from moving in the thrust direction. Resolved by counter.

The present invention will be described below with reference to the embodiments shown in the drawings. 1 is a counter frame, 2 is a plurality of character wheels rotatably mounted on a main shaft 1a provided in the frame 1, and 3 is provided in the frame 1. a support frame pivotably mounted on an auxiliary shaft 1b parallel to the main shaft, and a return pawl that can abut the heart cam portion 2a of each character wheel 2 and return the character wheel 2 to zero; 3a, and a shaft 3b for pivotally supporting a carry pinion 4 capable of driving each character wheel 2. 5 is an engagement boss that is fixedly disposed on the support frame 3 and is used to position the support frame 3 in the thrust direction; 6 is the entire range of movement of the engagement boss as the support frame 3 swings; This is an engagement groove defined by a rising wall portion, a slot, etc. fixedly disposed on the frame 1 so as to be able to engage with the engagement boss throughout the frame.

Since the present embodiment is constructed as described above, the support frame 3 is normally pressed into engagement with the carry pinion 4 on the character wheel 2 at the position shown by the solid line in FIG. 1 by a return spring (not shown). Cage, character wheel 2
is driven by the pinion 4. Here, since the engagement boss 5 fixed to the support frame 3 is engaged with the engagement groove 6 provided on the frame 1, the support frame 3 can swing about the auxiliary shaft 1b of the frame 1. However, movement in the thrust direction is restricted. In order to return the counter to zero from this state, the support frame 3 is rotated to the left against the tension of a regulating spring (not shown) by operating a push button (not shown) (as shown by the chain line in FIG. 1).
As a result, the return pawl 3a of the support frame 3 comes into contact with the heart cam portion 2a of the character wheel 2 to return each character wheel 2 to zero, and the carry pinion 4 returns to the character wheel 2.
At the same time as the pinion 4 is disengaged, the regulating spring comes into contact with the boss portion of the pinion 4, so that it is aligned in preparation for the next engagement with the character wheel 2, thus completing the zero return operation. At this time, the engagement boss 5 slides in the engagement groove 6 in the direction of the arrow in FIG. 2 as the support frame 3 swings (left rotation) to prevent the support frame 3 from moving in the thrust direction.

In the above embodiment, the support frame 3 is provided with the engagement boss 5 and the frame 1 is provided with the engagement groove 6, but as shown in FIG.
It is also possible to adopt a configuration in which an engaging portion 7 having a groove at the tip thereof is provided, and an engaging rail 8 that can engage with the engaging portion 7 is disposed on the frame 1. It is only necessary that the mating part engages with the engaging part provided on the frame so that it can slide in the rotational direction with respect to the swing axis of the support frame but is restricted in the thrust direction.
Although grooves are provided in the frame 1 on both sides of the engagement rail 8 in FIG. 3, these grooves may not be formed.

As described above, according to the present invention, the first engagement part fixedly disposed on the support frame and the second engagement part fixedly disposed on the frame are engaged with each other, so that the support frame Since the support frame is positioned in the thrust direction by such engagement, there is no need for the return spring to press the support frame, so it will not be compressed during installation. This simplifies assembly and reduces costs, and the dimensional accuracy of the thrust direction positioning of the support frame is determined by the small dimensions of the engagement portions provided between the support frame and the frame, so it must be accurately managed. This is extremely effective, as the support frame can be positioned in the thrust direction even when the return spring is made into a plate spring to streamline assembly.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the zero return type counter according to the present invention, Fig. 2 is a partial perspective view showing the engaged state of the engaging part, and Fig. 3 shows another configuration of the engaging part. FIG. 2 is a diagram similar to FIG. 2; 1...Frame, 1a...Main shaft, 1b...Auxiliary shaft, 2...Character wheel, 2a...Heart cam part, 3...
...Support frame, 3a... Return claw, 3b... Shaft, 4...
Carry pinion, 5... Engagement boss, 6... Engagement groove, 7... Engagement portion, 8... Engagement rail.

Claims (1)

[Scope of Claim for Utility Model Registration] In a zero return type counter equipped with a swingable support frame that pivotally supports a carry pinion, a first engaging portion fixedly disposed on the support frame; ,
Fixedly disposed on a counter frame capable of engaging with the first engaging portion over the entire range of movement of the first engaging portion in conjunction with the swinging of the support frame during zero return operation. and a second engaging portion, the engagement between the first engaging portion and the second engaging portion allows the support frame to swing, but prevents the support frame from moving in the thrust direction. A return-to-zero counter that is designed to prevent