JP3049110B2 - Number printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a number printer that prints a number by rotating a character ring up or down every rotation, and more particularly, to reliably return a character ring even at high speed printing. The present invention relates to a number printer capable of preventing vibration of a groove cam and smoothly moving an operating arm.

[0002]

2. Description of the Related Art As shown in FIG.
The feed claw is moved by the stroke of the operating arm 50.
When the character 51 is returned by operating the character 51, the number is moved up or down to perform printing. The arm 50 is a groove cam 53
And the numbering device A makes one stroke each time the numbering device A makes one rotation. That is, in the groove cam 53 shown in FIG. 4, the stroke is made when the arm 50 passes from the return start point a to the return end point b.

The numbering device A is connected to a rotating shaft 54.
When six are mounted at equal intervals in the circumferential direction, the stroke angle θ is set to about 57 °, and after the arm stroke of each numbering device A ends, the arm stroke of the next numbering device A starts. Was like that.

[0004]

However, conventionally, since the stroke angle θ is small, when the numbering device A is rotated at a high speed for high-speed printing, the stroke speed of the arm 50 increases, and as a result, There were many troubles in which the nail 51 returned the character ring 52 too much or started the next stroke before returning completely.

Since the groove cam 53 is mounted independently of the rotary shaft 54 of the numbering device A, when the numbering device A is rotated, the groove cam 53 vibrates, and this vibration causes the numbering device A to rotate at a high speed. It gets so intense that For this reason, the numbering device A is easily damaged, and it has conventionally been necessary to replace the numbering device with approximately 100,000 rotations as a guide.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to make it possible to reliably and smoothly return a character ring by a feed claw even in high-speed printing.
It is another object of the present invention to provide a number printer that can prevent the groove cam from vibrating and can smoothly stroke the operating arm.

[0007]

A representative means according to the present invention for solving the above-mentioned problems is a number printer which prints a number by rotating a character ring for each rotation. A stroke number for rotating a number ring by operating a feed claw connected to the operating arm by a stroke, and fitting the operating arm into the groove cam and rotating the numbering device along the groove cam; Sometimes, the arm stroke per rotation is performed in the range of 70-100 ° in the circumferential direction of the groove cam, and a bearing that prevents the vibration of the groove cam and allows the operating arm to stroke smoothly is provided. It is characterized by having been constituted by.

[0008]

In the above means, since the stroke angle of the operating arm is large, the stroke speed of the arm decreases when the numbering device makes one rotation along the groove cam. As a result, even when the numbering device is rotated at a high speed along the groove cam, the feeding pawl surely returns the character ring.

Further, in the present invention, since the bearing is provided on the groove cam, vibration of the shaft cam can be prevented, and the operating arm can be smoothly stroked.

[0010]

Next, an embodiment of a number printing device according to the present invention to which the above-mentioned means is applied will be described with reference to FIGS. FIG. 1 is an explanatory view of a groove cam for moving an operating arm, and FIG. 2 is an explanatory view of a number printer.

In the drawing, A is a numbering device, and the number can be moved up or down by sequentially feeding a character ring 1 having a number formed on a circumference by a feeding claw 2. The feed pawl 2 is connected to an operating arm 3, and the feed pawl 2 operates to return the character ring 1 when the arm 3 strokes in the direction of the arrow in FIG.

Six numbering devices A are attached at equal intervals in the circumferential direction of an attachment 4a attached to the rotating shaft 4, and the shaft 4 is driven by a driving source (not shown) as shown in FIG.
Is rotated in the direction of arrow r, and printing is performed while sequentially increasing or decreasing the number on the conveyed sheet.

A groove cam B has a groove 5 into which the operating arm 3 of the numbering device A fits, and is configured to make a stroke when the arm 3 moves along the groove 5. As shown in FIG. 1, the groove cam B is formed by combining two semi-circular members 6a and 6b and attaching them to a fixed shaft 8 with bolts 7 to form a loop-shaped cam groove portion 5.

As shown in FIG. 1, the groove 5 is formed at points ab.
The cams are configured as so-called cams having different distances from the center portion c, and the operating arm 3 is configured to make a stroke between the cams. That is, the operating arm 3 of the numbering device A rotating in the direction of arrow r in FIG.
Start the stroke at the point and operate the feed claw 2,
At the same time as starting to return the character ring 1, the stroke is ended at the point b and the returning of the character ring 1 is completed.

In the present invention, the stroke angle θ from the return start point a to the return end point b is made large, and is set in the range of about 70 ° ≦ θ ≦ 100 °, more preferably about 80 °. Set in the range of ° ≦ θ ≦ 90 °. In this embodiment, the angle θ is set to 86 °.

By increasing the stroke angle θ of the operating arm 3 as described above, the rotational speed of the rotary shaft 4 is increased, that is, when the print speed is increased, as compared with the conventional case where the stroke angle is small. The stroke speed is reduced, and as a result, the feed pawl 2 reliably returns the character ring 1.

A bearing 10 is mounted inside the groove cam B with an eccentric member 9 eccentrically mounted on the groove cam B. The bearing 10 receives the rotary shaft 4. Make up. Thus, even if the rotary shaft 4 rotates at a high speed, the groove cam B is supported by the rotary shaft 4 by the bearing 10, so that no vibration is generated, and the operating arm 3 smoothly strokes and moves. The wheel 1 is returned.

Further, by interposing the eccentric member 9, the attaching / detaching direction of the groove cam B can be adjusted, the stroke amount of the operating arm 3 can be widened, and the return of the ring 1 by the feed pawl 2 can be more reliably performed. It is possible to do it.

According to experiments conducted by the present inventor, when a number printer having a conventional configuration is used, the printing speed on a conveyed roll sheet is 110 to 120 at the maximum.
The limit is about m / min (rotational speed of the rotary shaft: 180 to 197 rpm). When printing at a higher speed, the return of the character ring by the feed pawl cannot be assured. On the other hand, when the printing is performed in the same manner using the number printer of the present embodiment configured as described above, even if the printing speed is set to 160 m / min (the rotation speed of the rotary shaft 4 is 262 rpm), the feed pawl 2 is not rotated.
Returned the character ring 1 reliably, and accurate number printing was possible. In addition, there was no need to replace the number printing device even when using over 100,000 rotations.

[0020]

As described above, according to the present invention, since the stroke angle of the operating arm is increased, the arm stroke per one rotation is slowed down. return. Therefore, number printing can be performed at high speed.

Further, in the present invention, the bearing is provided on the groove cam, so that the vibration of the groove cam can be prevented and the operating arm can be smoothly stroked.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a configuration of a groove cam of a number printer according to an embodiment of the present invention.

FIG. 2 is an explanatory perspective view of a number printer.

FIG. 3 is an explanatory perspective view of a conventional number printer.

FIG. 4 is an explanatory view of a conventional groove cam.

[Explanation of symbols]

A: Numbering device B: Groove cam S: Sheet 1 ... Ring 2 ... Feeding claw 3 ... Operating arm 4 ... Rotary shaft 5 ... Groove 6a, 6b ... Semicircular member 7 ... Bolt 8 ... Fixed shaft 9 ... Ecsen member 10 …bearing

Continuation of front page (56) References JP-A-57-125085 (JP, A) JP-B-62-232117 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B41K 3 / 10 B41F 11/00

Claims (1)

(57) [Claims] 1. A number printer for returning a character ring at each rotation to print a number, wherein a stroke of an operating arm operates a feed pawl connected to the operating arm to return a number character ring. The operating arm is fitted into the groove cam, and when the numbering device rotates along the groove cam, the arm stroke per rotation is 70 ° to 100 ° in the circumferential direction of the groove cam. A number printing device, wherein the groove cam is provided with a bearing for a rotary shaft.