JPS59219Y2 - Cutter lever return device in printer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a return device for a cutter lever in a printer.

Conventional printers have been developed that are equipped with a cutter device that cuts or forms perforations on printed paper drawn from roll paper or the like.

Such a cutter device has a cutter blade that moves back and forth in cooperation with a slit in a cutter receiving plate provided in the printer, and the paper held on the receiving plate changes depending on the depth at which the cutter blade penetrates into the slit. Serrated teeth are provided to cut or form perforations.

The cutter blade is supported by a holding member that reciprocates, and this holding member is operatively connected to a cutter operating lever, so that when the cutter lever is swung forward by an energizing means, the cutter blade is advanced. After cutting the paper or forming a perforation, the cutter lever is swung backward by the spring, so that the cutter blade is separated from the slit and returned to the retreated position, so that the next feeding of the paper can be carried out.

However, when cutting paper or forming perforations in particular, the cutter enters the slit along with the droop of the paper, causing a blockage, and when the cutter lever is moved back by the action of the spring, the force of the spring is insufficient, causing the cutter to cut. If the lever is not retracted, the cutter blade remains in the slit, causing a paper jam, which may make it impossible to feed the next paper, cut the paper, or form perforations.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cutter lever return device for a printer with a simple structure that eliminates the above-mentioned drawbacks and enables reliable paper cutting or perforation formation.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

Referring to the drawings, a printer suitable for incorporating the present invention has a main body 1, and a printed paper 3 drawn out from a built-in printed paper supply roll 2 passes through a guide 4 between a paper feed roller 5 and a pressure roller 6. After the desired printing character is selected on the printing shaft 1 by a printing hammer (not shown) by a printing hammer (not shown) with an ink ribbon (described later) interposed, a desired printing character is selected on the printing shaft 1 by a command from the printer control circuit. After printing is performed on the paper 3, it is guided along the receiving plate 8 and discharged from the printer.

A paper feed roller 5 that feeds the paper 3 is rotatably supported by the main body 1, has a ratchet gear 9 fixed on a fixed shaft 10, and is synchronized with the printing operation by the printing shaft 7 as described later. In this connection, a ratchet pawl lever 13, which is pivoted on a shaft 12 mounted on a slide lever 11 which is driven to perform horizontal reciprocating motion, is rotated after the printing operation is completed by cooperating with the aforementioned ratchet gear 9. to feed the paper.

That is, the ratchet pawl lever 13 is locked at one end to a pin 14 serving as a limiting pin and at the other end to the ratchet pawl lever 13, and is biased counterclockwise by a spring 15 supported around the shaft 12. The arm 13a extending upward is attached to the main body 1, although it has a tendency to engage with the ratchet gear 9.
The arm 17a of the paper feed lever 17 is pivotally supported by the shaft 16.
The paper feed lever 17 has one end attached to a pin 18 implanted in the main body 1, and the other end attached to the paper feed lever 17.
The ratchet pawl lever 13 is biased clockwise by a spring 19 that is engaged with the ratchet gear 9.

The other arm 17b of the paper feed lever 17 is made of a magnetically actuated material and cooperates with an electromagnetic solenoid 20, so that the slide lever 11 moves horizontally to the right from the position shown in the figure after the printing operation is completed. Solenoid 20 synchronously when
is energized by the control circuit, the paper feed lever 17 is attracted and swung counterclockwise, the ratchet pawl lever 13 is unlocked by the arm 17H, and the ratchet gear lever 13 is moved by the action of the spring 15. 9.

As a result, as the slide lever 11 moves to the right, the ratchet claw lever 13 rotates the ratchet gear 9, and hence the paper feed roller 5, so that the paper 3 held between the press roller 6 and the paper 3 is fed by a predetermined amount.

A check lever 22 pivoted to the main body 1 and urged counterclockwise by a spring 21 cooperates with the ratchet gear 9,
This prevents reverse rotation.

When the solenoid 20 is deenergized, the paper feed lever 17 is swung clockwise by the action of the spring 19, and engages with the arm 13a of the ratchet pawl lever 13 when the slide lever 11 is returned to the left as described later. and ratchet pawl lever 1
3 is removed from the ratchet gear 9 and held.

A limit pin 14 prevents excessive counterclockwise rotation of the ratchet pawl lever 13.

The slide lever 11 is supported by a pin and a long hole guide device 23 so as to be able to reciprocate horizontally with respect to the main body 1.
By reciprocating once from the illustrated position to the right and from the right movement position to the left illustrated position, the printed paper is selectively cut or perforated as described below, and the in-ribbon Sends.

That is, a shaft 2 is rotatably supported by the main body 1 and is constantly rotated by a drive motor (not shown) during operation of the printer.
A ratchet gear 25 is fixed to the shaft 24, and a slide lever driving cam disc 26 is rotatably supported on the shaft 24.
An eccentric cam (not shown) integrally fixed to the cam disk has a vertical hole length (not shown) formed in the slide lever 11.
When the cam disc 26 is rotated one turn counterclockwise from the position shown in the figure, the slide lever 11 is moved by the eccentric cam to the right from the position shown in the figure by an amount corresponding to the amount of eccentricity. Afterwards, it performs one reciprocating movement in which it returns to its original position.

In order to make one rotation of the cam disk 26 mentioned above, the cam disk 2
6, a ratchet pawl lever 28 is pivotally supported by a shaft 27, and as shown, a spring 29 urges the cam disk 26 inwardly and pivots the cam disk 26 outward from the position shown. It is restricted by a restriction pin 30 implanted in the.

At this limit position, the engaging pawl 28 of the ratchet pawl lever 28
a does not engage with the ratchet gear 25, so the cam disk 26 is held stationary.

A locking lever 31 is provided to restrain the ratchet pawl lever 28 in the above-mentioned limit position and hold the cam disk 26 stationary.

This locking lever 31 is pivotally supported on the main body 1 by a shaft 32, and is biased clockwise by a spring 33 so that the free end 31
a is held in sliding contact with the outer periphery of the cam disk 26, and the arm 31
The free end of a is the tip 2 of the ratchet pawl lever 28 mentioned above.
8b, and holds the ratchet pawl lever 2B in the position where it is locked to the restriction pin 30 as shown in the figure, and disengages it from the ratchet gear 25 to hold the cam disc 26 in a stationary state. .

In this position, the eccentric cam of the cam disk 26 is moved to the slide lever 1.
1 is held in the left position as shown.

The arm 31 a of the locking lever 31 is made of magnetically actuated material and is adapted to cooperate with an electromagnetic solenoid 34 .

Therefore, when the solenoid 34 is energized by the control circuit in a timed manner after the end of the printing operation of the printer, the locking lever 31 is attracted and swung counterclockwise, causing the limit pin 35 to be energized by the control circuit.
At this position, the free end of the arm 31a is disengaged from the distal end 28b of the ratchet pawl lever 28, and the ratchet pawl lever 28 is moved inward of the cam disk 26 by the action of the spring 29. The ratchet pawl 2 is swung toward the
8a engages with the ratchet I gear 25 which is constantly rotating, thereby rotating the cam disk 26 together with the ratchet pawl lever 28, and as described above, the slide lever 11 is moved to the right by the action of the eccentric cam. Ru.

Immediately after the solenoid 34 attracts the locking lever 31, the force is reduced, and the locking lever 31 is returned to a position in sliding contact with the outer periphery of the cam disk 26 by the action of the spring 33.

Therefore, the cam disk 26 rotates once, and the slide lever 11 rotates once.
When the ratchet pawl lever 2 completes one reciprocating movement,
The tip 28b of the lever 31 again comes into contact with the free end of the arm 31a of the lever 31 and is locked, and the ratchet pawl lever 2B is thereby swung to the position where it is locked to the restriction pin 30, thereby locking the ratchet pawl 28a. The cam disk 26 is separated from the ratchet gear 25 and held stationary after completing one rotation.

The ink ribbon 36 described above is connected to the ink ribbon supply knoll 37.
is supplied to the printing wheel 7 via guide rollers 38 and 39.
After being guided in close proximity to the supply reel 37, the ink ribbon is taken up on a take-up reel (not shown) arranged symmetrically with the supply reel 37, and when a predetermined supply amount is reached, a feed switching device (not shown) switches the ink ribbon from the take-up reel to the supply reel. 37, the ink ribbon 36 is fed, and this is alternately repeated.

In order to drive these knolls, an actuating member 41 is connected to the right end of the slide lever 11 via a spring 40, and the actuating member 41 is actuated in conjunction with the reciprocating movement of the slide lever 11 to feed the ink ribbon 36. However, since it is not directly related to the present invention, I will not explain it in detail.

Before explaining the selective paper cutting or perforation operation that is performed in conjunction with the reciprocating movement of the slide lever 11, the stamp device 42 is used to print a certain stamp on the printed paper 3 that is performed in connection therewith. The operation of this will be explained.

The above-mentioned printer was designed to be used in shops etc. to print slips handed over to customers as receipts, etc. Therefore, in addition to the necessary printing, certain printed text for advertising etc. can be printed on slips using the printer. A stamp device 42 is provided so that stamps can be printed all at once without having to be activated.

When the stamp device 42 is brought into contact with the receiving plate 8 with the paper 3 interposed therebetween for stamp printing, the entire surface of the stamp device 42 is uniformly stamped on the receiving plate 8.
The stamp holding member 44 is supported by an L-shaped stamp holding member 44 that supports a support member 43 that is movably supported so as to be pressed against the guide member 4 fixed to the main body 1.
The guide shaft 46 provided in the holding member 44 has a long hole (
(not shown), the guide member 4 is guided so as to be able to reciprocate horizontally by a predetermined distance by slidingly fitting into the guide member 4 (not shown).
Pin 47 to be implanted in 5 and pin 4 to be implanted in holding member 44
The holding member 44 is held in the retracted position, that is, in a position where the stamp device 42 is spaced apart from the receiving plate 8, by a spring 49 stretched between the holding member 44 and the receiving plate 8.

An upright bent piece 44a is formed at the rear end of the stamp holding member 44, and is connected via a spring or the like (not shown) to a pin 52 installed at the upper end of a stamp operating lever 51 that is pivotally supported on the main body 1 by a shaft 50. When the stamp operating lever 51 is swung counterclockwise, the stamp holding member, and thus the stamp device 42, is moved forward against the action of the spring 49 and comes into contact with the pedestal 8, and the spring action is applied. Stamp printing can be performed on the interposed paper 3 by applying an appropriate pressing force.

The stamp operating lever 51 is pivotally connected to a plunger 54 of an electromagnetic solenoid 53 attached to the main body 1 at its lower end by a pin and elongated hole connecting device 55, and is formed to hang down from the rear end of the guide member 45. A spring 56 tensioned between the folded piece 451 and a portion of the stamp actuating lever 51 above the shaft 50 normally urges it to swing clockwise, thereby holding the stamp device 42 in the retracted position. However, when the solenoid 53 is energized by the control circuit while the printer finishes printing on the paper 3 and the paper 3 is stopped and held, the plunger 54 is attracted and the stamp operating lever 51 is activated by the spring. The stamp holding member 44 is moved to the left by being swung counterclockwise against the action of the stamp member 56;
The stamp printing described above is performed.

The above-mentioned printer cuts the completed slip from the paper 3 to be handed over to the customer when the printing and stamp printing is finished, and selectively forms a perforation in the part where the stamp is not printed and then cuts it and uses it for in-store processing. A cutter device 57 is provided for cutting the paper and making perforations as possible, and the cutter device 57 and the stamp device 4
2 means that the paper 3 is cut by the cutter device 57 when the stamp device 42 is operated to print a stamp, and the stamp device 42 is cut after printing by a predetermined printer.
The slide lever 1 selectively cooperates to create a perforation when the paper 3 is fed a predetermined amount without being activated.
1 and the electromagnetic solenoid 53.

For this purpose, a switching lever (not shown) is used as the stamp holding member 4.
4 and the cutter holding member 60, this switching lever is selectively operated by an electromagnetic solenoid (not shown), and when the electromagnetic solenoid is energized, stamp printing of the stamp device 42 and stamp printing of the cutter device 57 are performed. The paper cutting operation is allowed, but when the electromagnetic solenoid is deenergized, the switching lever stops the stamp device 42 in a position separated from the receiving plate 8, preventing stamp printing, and at the same time changing the forward position of the cutter device 57 to the perforation position. The perforation is formed by restricting the cutting to the forming position and preventing cutting.

The cutter device 57 includes a cutter 58 and a cutter holding member that fixedly holds the cutter and is guided by a guide member 59 fixed to the main body 1 so as to be able to reciprocate horizontally by a predetermined distance by a pin, a slot guide device, etc. (not shown). Contains 60.

This cutter holding member 60 has an engagement hole (not shown) and is formed by being bent at the upper end of a cutter operating tab 62 which is pivotally supported on the main body 1 by a shaft 61, and has a notch provided in the holding member 59. The bent piece 63 extending upward through the above-mentioned engaging hole of the holding member 6u fits into the cutter operating lever 6.
2 is swung counterclockwise, the cutter blade 59 is advanced together with the holding member 60, and the slit 69 formed in the receiving plate 8 is moved forward together with the holding member 60.
and selectively cut the paper or form perforations depending on its advanced position as described above.

Therefore, the cutter operating lever 62 is normally rotated clockwise, that is, by a spring 64 stretched between the hanging new piece 45a of the guide member 45 and the portion above the shaft 61 of the cutter operating lever 62, that is, the cutter blade 58 is rotated clockwise. A shaft 65 is provided at the lower end of the shaft 65, and a slide connecting lever 66 is pivotally supported on the shaft 65.

The slide connecting lever 66 is biased clockwise by a spring 67 stretched between it and the main body 1, and the right arm 66
The end of the left arm 66b is engaged with a bent piece 51a formed on the stamp operating lever 51, and a bent piece 66C is formed at the end of the left arm 66b.

A first step 11a and a second step 11 are attached to the slide lever 11 so as to be selectively engaged with this bent piece 66C.
b is formed.

That is, in the illustrated state, the arm 66a is locked by the bending piece 51a, and the bending piece 66C is connected to the first and second step portions 1.
1a and 11b, and the slide connecting lever 6 is removed regardless of the reciprocating movement of the slide lever 11.
6 is in an inoperative state, and the cutter operating lever 62 is not operated, so the cutter device 57 is held in an inoperative state.

When the electromagnetic solenoid 53 is energized and the electromagnetic solenoid for energizing the aforementioned switching lever is energized, the stamp actuating lever 51 is allowed to swing throughout its entire stroke, so the stamp device 42 is moved forward and the paper is removed. The stamp is printed on the folded piece 5 by the swinging of the lever 51 throughout the entire stroke
1 a moves downward and the bent piece 66 of the slide connecting lever 66
The slide coupling lever 66 is swung by the action of the spring 67 to a position where the lever C engages with the first step 11 a of the slide lever 11 .

Accordingly, as the slide lever 11 moves to the right, the slide coupling lever 66 also moves to the right, which allows the cutter actuating lever 62 to swing its entire stroke in the counterclockwise direction, so that the cutter device 57 cuts the paper 3.

On the other hand, when the electromagnetic solenoid of the switching lever is deenergized, the switching lever moves to the stamp holding member 44 as described above.
Since the cutter holding member 60 and the cutter holding member 60 are at the position where the forward movement thereof is restricted to the stamp printing blocking position and the perforation forming position, respectively, the solenoid 53 is energized and the stamp operating lever 51 is swung counterclockwise. Sometimes, the swinging range is limited, stamp printing is not performed, and the downward movement position of the bending piece 51a is limited, so that the bending piece 66C of the slide connecting lever 66 is moved to the second step of the slide lever 11. 11b, and therefore the second step portion 11b is at a more backward position than the first step portion 11a with respect to the rightward movement direction of the slide lever 11, so that the slide connection is not completed. The rightward movement of the lever 66 is small, which limits the amount of advance of the cutter holding member 60, and advances the cutter blade 58 to the position where perforations are formed on the paper as described above.

The feature of the present invention is that the cutter blade 58 enters into the slit 69 at the time of paper cutting or especially when forming perforations.
is in a closed state, and when the cutter operating lever 62 should be swung clockwise by the action of the spring 64 during the next retreat of the cutter blade 58, the action force of the spring 64 is insufficient and the cutter operating lever 62 is not swung. blocked, next paper feed,
The present invention provides means for reliably preventing paper cutting or perforation formation from becoming impossible.

Of course, in order to ensure the return swing of the cutter operating lever 62 as described above, the force acting on the spring 64 may be increased, but in that case, it is necessary to resist the strong spring force in order to move the cutter blade 58 forward. Since the cutter operating lever 62 must be moved forward and swung forward, a larger driving force is required, a large amount of electric power is required, and the printer as a whole must be enlarged, making it unsuitable for printers that are desired to be downsized. .

The present invention eliminates the above-mentioned paper jam by utilizing the force exerted when the slide lever 11 moves backward, that is, to the left, with a completely simple structure without such problems.

As described above, since the slide lever 11 is selectively connected to the continuously rotating drive shaft 24 by an eccentric cam and reciprocated, the force of the reciprocating movement is extremely large and does not cause malfunction.

That is, in the present invention, the slide lever 11 is formed with a retaining portion, ie, a new piece 6B, which can engage with the right side of the cutter operating lever 62 and/or the slide connecting lever 66.

By forming the bent piece 68 in this way, the slide connecting plate 66 selectively connects to the first or second step portion 11 a or 11 of the slide lever 11 when cutting paper or forming perforations.
When the bending piece 68 is actuated and moved to the right by the lever b, the bending piece 68 is naturally moved to the right together with the slide lever 11 (indicated by 68' in the drawing), so there is no effect on the operation of the cutter actuation lever 62 and the slide connection lever 66. not give.

When paper cutting or perforation formation is completed and the cutter actuating lever 62 is about to be swung backwards clockwise by the action of the spring 64, if the cutter blade 58 remains in the closed state in the sulins 1 to 69. When the cutter operating lever 62 is prevented from swinging, the bending piece 68 actively moves the cutter operating lever 62 and/or the slide connecting lever 66 to the left when the slide lever 11 moves back, that is, to the left. Since the cutter operating lever 62 is forced to swing clockwise, the cutter blade 5B is surely removed from the slit 69, and thereafter the cutter blade 5B is freely moved backward by the action of the spring 64. It makes it possible.

Therefore, paper jams are reliably prevented.

Although the invention has been described using roll paper, it is applicable to cutting or perforating sheets of other paper or other materials.

[Brief explanation of the drawing]

The accompanying drawing is a side view showing an embodiment of the printer of the present invention. 1...Printer body, 11...Slide lever 57...Cutter device, 5B...
... Cutter blade, 60 ... Holding member, 62.
...Cutter operating lever, 64...Spring, 66...Slide connection lever, 68...
...Bent piece, 69...Slit.

Claims (1)

[Claim for Utility Model Registration] Supports a cutter blade that cooperates with the slit in the cutter receiving plate, and is capable of reciprocating movement between a first position for cutting paper, etc. and a retracted position. a cutter lever member; a spring member that constantly urges the cutter lever member in the direction of the retracted position; The cutter lever member is moved in the direction of the first position for cutting against the spring member, and during the backward movement, the cutter lever member is returned to the retreated position by the action of the spring member. A printer equipped with a slide lever member configured to allow the slide lever member to move, by forming an engaging portion on the slide lever member that can engage with the cutter lever member when the slide lever member moves back. When the cutter blade bites into paper or the like and its backward movement is blocked, the retainer actively presses the cutter lever member during the return movement of the slide bar member to prevent the cutter blade from digging in. A return device for a cutter lever in a printer, characterized in that the cutter lever is released and the cutter lever member can be moved by the action of the spring member.