JP2529398Y2 - Carbon ribbon supply shaft braking mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a supply shaft on which a strip-shaped member such as a carbon ribbon used in an electronic printer, which is wound in a thin roll, is mounted. The present invention relates to a braking device that suppresses excessive rotation during feeding.

(Prior art) Conventionally, as a braking device for a supply shaft on which a belt member having a particularly small thickness such as a carbon ribbon is loaded, the present invention relates to (a) Japanese Utility Model Application Laid-open No. Appropriate feeding devices) and (b) Japanese Utility Model Application Laid-Open No. 59-32451 (means for preventing the belt from meandering) are known.

In the prior art (a), the intermediate portion of a single spring belt having both ends fixed to the pulley of the supply shaft of the carbon ribbon is stretched to prevent excessive rotation of the supply shaft during feeding of the carbon ribbon. ing.

The above-mentioned prior art (b) includes, on one side of a carbon ribbon supply shaft, clutch means comprising a pressing spring,
Excessive rotation of the supply shaft is prevented.

Here, the carbon ribbon has a structure in which a carbon treatment is applied to the front side of the ribbon wound in a roll shape and a structure in which the carbon treatment is applied to the back side of the ribbon wound in a roll shape. And backing carbon.

In this case, the feeding direction of the carbon ribbon to be printed by being pressed against the continuous tag or the continuous label is opposite to the front winding and the back winding.

Therefore, the supply shaft loaded with the wound carbon ribbon rotates in either the clockwise direction or the counterclockwise direction depending on the type of the loaded carbon ribbon.

Thus, particularly in the prior art (a), since a single spring belt is simply stretched over, a slight braking action works clockwise or counterclockwise of the supply shaft, but a slip phenomenon occurs. The restoring action is therefore halved.

The clutch means of the prior art (b) also suppresses rotation of the supply shaft in the clockwise or counterclockwise direction, but cannot provide a restoring action, and causes a slack on the traveling path that occurs when the carbon ribbon is fed. However, since this slack cannot be restored (a state in which a constant tension is applied as in a state before the carbon ribbon is fed), there is a defect that wrinkles are generated.

(Problems to be Solved by the Invention) Therefore, complete suppression of excessive rotation of the supply shaft in both the clockwise direction and the counterclockwise direction, which occurs when the carbon ribbon is fed, and the slack at the time of feeding, are prevented. There has been a demand for a braking device that can make the pressure constant.

Thus, an object of the present invention is to provide a braking mechanism for a supply shaft that can solve the above-described problems.

(Means for Solving the Problems) The supply shaft braking mechanism of the present invention comprises a main body frame 1 of a rotatable supply shaft 3 on which a carbon ribbon 2 wound in a roll and attached to a main body frame 1 is loaded. And a split spring belt 4a, 4b extending over a tension ring 7 fitted to the supply shaft 3. The fixed side plate 8a of the frictional connection member 8 of the supply shaft 3 Side plate 8b
A friction member 8c sandwiched between the carbon ribbon 2 and a friction clutch means comprising a cylindrical shaft 10 and the like elastically biased by a clutch spring 11 and the like are provided on the friction member 8c so that the front and back windings of the carbon ribbon 2 are provided. The configuration is such that the excessive rotation at the time of feeding in any direction corresponding to the type is suppressed.

(Operation) The carbon ribbon 2 wound in a roll shape and held on the supply shaft 3 via the cylindrical shaft 10 passes through the following two paths in the printing section between the thermal head 17 and the platen roller 16. The desired printing is performed by being sandwiched between the printing belts 40 such as a continuous label and a continuous tag.

The path of the back-wound carbon 2a reaches the printing section via the guide rollers 15a and 15b. The path of the surface-wound carbon 2b directly reaches the printing section via the guide roller 15b.

The printed band 40 printed in this way is guided to the front of the machine, and the carbon 2 after the printing operation is wound on the winding shaft 20 which obtains a drive source from the stepping motor M.

Next, the braking mechanism of the supply shaft 3 is a double braking system.
The first stage is the friction clutch means 8 to 12,
The second stage is the divided spring belt 4a, 4b means.

Specifically, in the electronic printer, the platen roller 16 and the winding shaft 20 connected to the stepping motor M
An intermittent step operation is performed in which a stop process for stopping the printed band 40 and the carbon ribbon 2 for printing and a transfer process for transferring the band 40 and the ribbon 2 are alternately repeated.

On the other hand, the supply shaft 3 is basically stopped, and when the carbon ribbon 2 is pulled in the above-described transfer stroke, the ribbon 2 is integrated with the cylinder shaft 10 within a range where the friction clutch means operates. Of the one of the spring belts (4a or 4b) corresponding to the direction in which the belt is extended, and the restoring force is accumulated in the belt. When the traction force of the carbon ribbon 2 exceeds the operating range of the friction clutch means, the friction clutch means slips and absorbs the excessive rotation.

Further, the supply shaft 3 performs an inertial operation such that the carbon ribbon 2 sags between the platen roller 16 and the supply shaft 3 every time the supply stroke is reversed from the above-described transfer stroke to the stop stroke.
Since the tension in the carbon ribbon 2 disappears, the spring belt immediately rotates in the reverse direction in the direction in which the carbon ribbon 2 is wound by the restoring action of the above-mentioned spring belt to apply a constant tension to the carbon ribbon 2 so that wrinkles caused by slack are generated. Prevent the occurrence.

(Example) Regarding the braking device for the supply shaft of the carbon ribbon of the present invention,
This will be described with reference to FIG.

A main frame 1 of the electronic printer is provided with a supply shaft 3 for a rotatable carbon ribbon 2 and a take-up shaft 20 for driving connected to a stepping motor M.

Next, referring to FIG. 1 and FIG. 2 which is a cross-sectional side view of the supply shaft 3, the supply shaft 3 is fitted between the friction coupling member 8 provided on the supply shaft 3 and the main body frame 1. The tension ring 7 is provided with split spring belts 4a and 4b.

Next, as shown in detail in FIG. 2, the tension ring 7 is connected to the supply shaft 3 by a hook member 5, and is synchronized with the supply shaft. On the other hand, one of the split spring belts 4a is bridged between the retaining member 5 and the stop screw 6a screwed to the main body frame 1, and the other split spring belt 4b is connected to the stop screw 6b. It has been bridged.

Further, the tension ring 7 is connected to a fixed side plate 8a of the friction connecting member 8 with a set screw 9a.

Therefore, the rotation of the supply shaft 3 in the counterclockwise direction is controlled by the split spring belt 4a, and the supply shaft 3 is rotated in the clockwise direction b.
Is configured such that the split spring belt 4b acts.

Next, a friction clutch means provided between one side of the supply shaft 3 and the cylinder shaft 10 will be described.

The friction connecting member 8 includes a solid side plate 8a, a movable side plate 8b, and a friction member 8c such as felt sandwiched between the side plates 8a and 8b.
Consisting of As described above, the fixed side plate 8a is fixed by the tension ring 7 with the set screw 9a, and the movable side plate 8b is fixed to the friction member 8c.
At the same time, a set screw is attached to the cylindrical shaft 10 fitted to the supply shaft 3.
It is fastened with 9b.

At the end of the supply shaft 3 and the cylinder shaft 10, a clutch spring 11 is interposed on the supply shaft 3 and is screwed with a set screw 12, so that the entire cylinder shaft 10 is interposed with the movable side plate 8b. Then, the friction portion 8c elastically urges the fixed side plate 8a, and this supply shaft 3
This is a configuration that suppresses the free rotation of.

The carbon ribbon 2 thus wound around the paper tube 13 in a roll shape is fitted on the cylindrical shaft 10 fitted on the supply shaft 3.

The roll-shaped carbon ribbon 2 is elastically held by a leaf spring 13 provided at a central portion of the cylindrical shaft 10 in order to prevent the carbon ribbon 2 from falling off. It is configured.

Next, returning to FIG. 1, a print frame 30 is provided below the supply shaft 3 and the take-up shaft 20 for the carbon ribbon 2, and the print frame 30 has guide rollers 15a and 15b,
7. Guide rollers 18 and 19 are installed. A platen roller 16 is provided opposite to the thermal head 17. Between the thermal head 17 and the platen roller 16, the carbon ribbon 2 and the printed band 40 such as a continuous label and a continuous tag are superimposed, and desired printing is performed on the printed band 40.

Next, a driving source for moving the band 40 to be printed and the carbon ribbon 2 is a stepping motor M. The belt 22 is suspended around the motor shaft 21 and the pulley 23, and the rotational force of the stepping motor M is Communicate to 23. A gear 24 is provided coaxially with the pulley 23, and the gear 24 transmits the gear 24 to the gear 25 of the platen roller 16 to impart rotation to the platen roller 16.

On the other hand, the rotational force from the pulley 23 is transmitted to the pulley 27 of the winding shaft 20 of the carbon ribbon 2 via the belt 26,
A rotational force is applied to the winding shaft 20. Reference numeral 28 denotes a friction coupling member of the winding shaft 20 (a function of preventing an increase in the winding amount of the ribbon 2 per unit rotation due to an increase in the winding diameter of the carbon ribbon 2).

Next, a guide route between the carbon ribbon 2 and the printed band 40 will be described.

The carbon ribbon 2 has two paths. The back-wound carbon 2a passes through the guide rollers 15a and 15b, and further passes through the ribbon detection sensor 29, and the thermal head 17 and the platen roller.
In 16 parts, the guide roller is sandwiched together with the printing belt 40.
After passing through 18, 19, it is wound on a winding shaft 20.

On the other hand, the front-wound carbon 2b directly passes through the guide roller 15b, and thereafter, takes up the winding shaft along the same route as the back-wound carbon 2a.
Wound to 20.

In the drawing, reference numerals 41 and 42 denote guide rollers and a pitch detection sensor of the band 40 to be printed.

The printed band 40 on which the desired printing has been performed is continuously fed out of the apparatus. If necessary, the cutting unit 50
Is connected to the printer, so that the print band 40 can be cut into a predetermined length. In the figure, 51 is a fixed blade, 52 is a rotary blade, and 53 and 54 are holding rollers.

Further, in the case where the print band 40 is a label continuous body in which a large number of label pieces are temporarily attached to the tape-shaped backing paper, and such label pieces are to be automatically peeled off, instead of the cutting unit 50, A desired label can be peeled by connecting a label peeling unit (not shown) to this machine and turning the tape-shaped backing sheet.

Next, the braking action of the supply shaft 3 into which the cylindrical shaft 10 for loading the carbon ribbon 2 wound in a roll shape is inserted will be described.

As described above, this braking mechanism is of a double braking type, the first stage of which is friction clutch means 8 to 12, and the second stage of which is split spring belts 4a and 4b.

The supply shaft 3 is rotated by a predetermined amount in the counterclockwise direction a when the back-wound carbon 2a is extended, and in the clockwise direction b when the front-wound carbon 2b is extended. That is, the feeding of the carbon ribbon 2 rotates the cylindrical shaft 10, and the friction clutch means 8 to 12 operate. In this case, the friction clutch means is used until the tension of the carbon ribbon 2 reaches a certain level.
It rotates together with the supply shaft 3 so as to store a restoring force in the spring belt against the tension of the spring belt. However, the friction clutch means slips when a certain level of tension is applied to the carbon ribbon 2 and keeps the supply shaft 3 fixed so that the feeding of the carbon ribbon 2 is continued.

Then, when the feeding of the carbon ribbon 2 is stopped,
Although the carbon ribbon tends to cause slack, the entire portion from the supply shaft 3 to the cylinder shaft 10 is rotated reversely by the restoring action of the spring belt. Kept in state.

Specifically, in the electronic printer, the platen roller 16 and the winding shaft 20 connected to the stepping motor M
An intermittent step operation is performed in which a stop process for stopping the printed band 40 and the carbon ribbon 2 for printing and a transfer process for transferring the band 40 and the ribbon 2 are alternately repeated.

On the other hand, the supply shaft 3 is basically stopped, and when the carbon ribbon 2 is pulled in the above-described transfer stroke, the ribbon 2 is integrated with the cylinder shaft 10 within a range where the friction clutch means operates. Of the one of the spring belts (4a or 4b) corresponding to the direction in which the belt is extended, and the restoring force is accumulated in the belt. When the traction force of the carbon ribbon 2 exceeds the operating range of the friction clutch means, the friction clutch means slips and absorbs the excessive rotation.

Further, the supply shaft 3 performs an inertial operation such that the carbon ribbon 2 sags between the platen roller 16 and the supply shaft 3 every time the supply stroke is reversed from the above-described transfer stroke to the stop stroke.
Since the tension in the carbon ribbon 2 disappears, the spring belt immediately rotates in the reverse direction in the direction in which the carbon ribbon 2 is wound by the restoring action of the above-mentioned spring belt to apply a constant tension to the carbon ribbon 2 so that wrinkles caused by slack are generated. Prevent the occurrence.

(Effect) On one side of the supply shaft 3 in which the cylindrical shaft 10 for loading the carbon ribbon 2 is inserted, friction clutch means 8 to 12 are provided between the supply shaft 3 and the cylindrical shaft 10.
To prevent the excessive rotation occurring when the carbon ribbon is fed, and to provide a split spring belt 4
a, 4b means, the slack of the carbon ribbon 2 caused by the excessive rotation in which the slip phenomenon of the supply shaft 3 occurs occurs when the feeding of the carbon ribbon 2 is stopped by the spring belts 4a, 4b means. The supply shaft 3 can be absorbed by rotating the supply shaft 3 in the reverse direction. Therefore, the tension of the carbon ribbon 2 is kept constant in any of the directions corresponding to the types of the front winding and the back winding, which is effective for preventing wrinkles generated by slack.

[Brief description of the drawings]

The drawings each show a carbon ribbon supply shaft braking mechanism of the present invention, FIG. 1 is a schematic front view of the entirety, and FIG. 2 is a cross-sectional side view of the supply shaft portion. DESCRIPTION OF SYMBOLS 1 ... Body frame, 2 ... Carbon ribbon 2a ... Back-wound carbon (label) 2b ... Front-wound carbon (tag) 3 ... Supply shaft 4a, 4b ... Split spring belt means 5 ... Hook Member 7 tension ring a counterclockwise b clockwise 8a, 8b, 8c, 9a, 9b, 10, 11, 12 clutch means 8 friction coupling member 8a fixed side plate 8b Movable side plate, 8c Friction member 9a, 9b Set screw, 10 Shaft shaft 11 Clutch spring 12 Lock screw 15a Guide roller (back-wound carbon) 15b Guide Roller (front and back carbon) 16 Platen roller 17, Thermal head 20 Winding shaft M Stepping motor 30 Print frame 40 Printed band (label, tag).

Claims (1)

(57) [Scope of request for utility model registration] 1. A supply shaft rotatably disposed in which a cylindrical shaft into which a carbon ribbon wound in a roll shape is loaded is inserted and friction clutch means is interposed between the supply shaft and the cylindrical shaft. A split spring belt means for exerting a braking action independently in both directions of its rotation, and a carbon ribbon supply shaft braking mechanism.