阅读说明：本技术 印刷头以及印刷装置 (Print head and printing apparatus ) 是由 山田岳史 于 2019-05-30 设计创作，主要内容包括：本发明提供一种印刷头以及印刷装置。在点击打式的印刷头中,在减少相对于杆的转动支点部的滑动阻力的同时,使杆的动作稳定。印刷头具备：针；杆,其顶端部与针连结；驱动部,其对杆进行驱动；支承部,其将杆的基端部支承成能够移动；按压弹簧,其以从杆设置预定的间隙的方式被配置,并在通过驱动部而对杆进行驱动时,对杆的基端部的移动进行限制。(The invention provides a printing head and a printing device. In a dot impact type print head, the sliding resistance of a lever with respect to a pivot portion of the lever is reduced, and the operation of the lever is stabilized. The print head includes: a needle; a rod having a tip end connected to the needle; a driving unit that drives the lever; a support portion that movably supports a base end portion of the rod; and a pressing spring which is disposed so as to provide a predetermined gap from the rod and which restricts movement of the proximal end portion of the rod when the rod is driven by the driving portion.)

1. A print head includes:

a needle;

A rod having a tip end portion connected to the needle;

A driving unit that drives the lever;

A support portion that movably supports a base end portion of the rod;

And a regulating member that is disposed so as to provide a predetermined gap from the rod and regulates movement of the proximal end portion of the rod when the rod is driven by the driving portion.

2. The printing head of claim 1,

The rod is driven by the driving part to move the needle in a first direction, and the base end part of the rod moves in a second direction opposite to the first direction,

The restricting member restricts movement of the proximal end portion of the rod in the second direction.

3. The printing head of claim 2,

The restricting member has:

A first regulating portion located on the second direction side with respect to a base end portion of the rod;

A second restriction portion located in a direction intersecting the second direction with respect to a base end portion of the rod,

the movement of the lever to the base end portion side is restricted by the second restricting portion.

4. The printing head of claim 3,

The support portion has a support surface that supports the base end portion of the rod on the first direction side,

The second regulating portion of the regulating member abuts against the bearing surface.

5. The printing head of claim 3,

Having a base disposed between adjacent ones of the rods,

the first regulating portion of the regulating member abuts against the base.

6. The printing head of any of claims 1 to 5,

the proximal end portion of the rod has a protruding portion that faces the regulating member.

7. the printing head of any of claims 1 to 3,

The restricting member is an elastic member that elastically deforms in contact with the base end portion of the rod.

8. A printing apparatus includes:

A print head;

A conveying part for conveying the printing medium,

The printing apparatus conveys the printing medium by the conveying unit and prints on the printing medium by the print head,

The print head includes:

A needle;

A rod having a tip end portion connected to the needle;

a driving unit that drives the lever;

A support portion that movably supports a base end portion of the rod;

And a regulating member that is disposed so as to provide a predetermined gap from the rod and regulates movement of the proximal end portion of the rod when the rod is driven by the driving portion.

Technical Field

The present invention relates to a printing head and a printing apparatus.

background

Conventionally, there is known a dot impact printer which prints by striking a needle on a recording sheet through an ink ribbon. A print head of a general dot impact printer drives a lever by a driving coil and performs printing by projecting a needle from the lever (for example, see patent document 1). In the configuration of patent document 1, a fulcrum pressing spring for pressing the lever is disposed in the print head so as not to deviate the lever.

As disclosed in patent document 1, in the structure in which the pivot of the lever is always pressed by the pressing spring, since sliding resistance is generated in the pivot portion of the lever, it is not easy to increase the speed of the lever operation.

Patent document 1: japanese laid-open patent publication No. 2-281964

disclosure of Invention

The invention aims to reduce sliding resistance relative to a rotation fulcrum part of a lever and stabilize the action of the lever in a dot impact type printing head.

In order to achieve the above object, a print head according to the present invention includes: a needle; a rod having a tip end portion connected to the needle; a driving unit that drives the lever; a support portion that movably supports a base end portion of the rod; and a regulating member that is disposed so as to provide a predetermined gap from the rod and regulates movement of the proximal end portion of the rod when the rod is driven by the driving portion.

In the present invention, the needle may be moved in a first direction by driving the rod by the driving unit, the proximal end portion of the rod may be moved in a second direction opposite to the first direction, and the restricting member may restrict the proximal end portion of the rod from moving in the second direction.

In addition, the present invention may be configured such that the regulating member includes: a first regulating portion located on the second direction side with respect to a base end portion of the rod; and a second regulating portion that is located in a direction intersecting the second direction with respect to a base end portion of the rod, and that regulates movement of the rod toward the base end portion side by the second regulating portion.

in the present invention, the support portion may have a support surface that supports the base end portion of the rod in the first direction, and the second regulating portion of the regulating member may abut against the support surface.

In the present invention, the first regulating portion of the regulating member may be in contact with the base, and the second regulating portion of the regulating member may be in contact with the base.

In the present invention, the proximal end portion of the rod may have a protruding portion that faces the regulating member.

In the present invention, the restricting member may be an elastic member that elastically deforms in contact with the proximal end portion of the rod.

In addition, the present invention may be configured such that the printing apparatus includes: a print head; a conveying unit that conveys a printing medium, wherein the printing apparatus conveys the printing medium by the conveying unit and prints on the printing medium by the print head, and wherein the print head includes: a needle; a rod having a tip end portion connected to the needle; a driving unit that drives the lever; a support portion that movably supports a base end portion of the rod; and a regulating member that is disposed so as to provide a predetermined gap from the rod and regulates movement of the proximal end portion of the rod when the rod is driven by the driving portion.

Drawings

Fig. 1 is a perspective view showing an internal configuration of a printing apparatus according to a first embodiment.

Fig. 2 is a side view of a print head.

Fig. 3 is a longitudinal sectional view of a print head.

Fig. 4 is a perspective view showing an internal structure of the print head.

Fig. 5 is a longitudinal sectional view of a main part of the print head.

fig. 6 is a main part sectional view of the print head.

fig. 7 is a perspective view showing an internal structure of a print head according to a second embodiment.

fig. 8 is a longitudinal sectional view of a main part of the print head.

Detailed Description

1. First embodiment

1-1. Structure of printing device

The overall configuration of the printing apparatus 1 will be explained.

Fig. 1 is a perspective view showing an internal configuration of a printing apparatus 1 to which a first embodiment of the present invention is applied.

The printing apparatus 1 is a dot impact printer that prints by striking a needle 3, which will be described later, on a printing medium 4 via an ink ribbon 2 by a print head 5. The printing apparatus 1 includes a print head 5 and a platen 6 disposed opposite the print head 5 with the print medium 4 therebetween. The platen 6 is a platen roller that rotates by a driving force of a not-shown conveyance motor, and functions as a conveyance section that conveys the print medium 4.

The printing apparatus 1 stores an ink ribbon 2, and an ink ribbon cassette 7 for supplying the ink ribbon 2 is mounted between the print head 5 and the platen 6.

The printing apparatus 1 includes a main body frame 11 including a right frame 11a disposed on a right side of a main body of the printing apparatus 1 and a left frame 11b disposed on a left side of the main body. A guide shaft 10 is bridged between the right frame 11a and the left frame 11 b. The guide shaft 10 supports a carriage 9 on which the print head 5 is mounted.

The carriage 9 is mounted so as to be movable back and forth along a guide shaft 10 extending in the paper width direction of the print medium 4, and scans the print head 5 in the paper width direction of the print medium 4.

1-2. Structure of print head

Fig. 2 is a side view of the print head 5.

The print head 5 includes a head 21 on a side facing the platen 6. As described later, the needle 3 is disposed inside the head 21, and the needle 3 projects from the head 21 toward the platen 6 and strikes the ink ribbon 2 against the print medium 4. Further, a cover 19 is attached to the print head 5 from the side opposite to the platen 6 side. The cover 19 is fixed to the print head 5 by a plate spring 23.

Fig. 3 is a longitudinal sectional view of the print head 5. Fig. 4 is a perspective view showing an internal structure of the print head 5. In fig. 4, the needle 3 and the cap 19 are not shown for convenience of explanation. Fig. 5 is a longitudinal sectional view of a main part of the print head 5, and particularly shows the vicinity of the bar 18 enlarged and shown.

as shown in fig. 3, the print head 5 includes a frame 17 made of a magnetic material, a spring holder 20, a head 21, and a substrate 24. The base plate 24 is fixed to the frame 17, and the head 21 is fixed to the frame 17 together with the base plate 24. Further, a lid 19 is fixed to the frame 17 via a leaf spring 23. The plate spring 23 engages with the head 21, and presses the end surface of the lid 19 together with the spring holder 20 by the elastic force.

An opening is formed in the center of the frame 17, and the frame 17 has a thick annular shape as a whole. A cylindrical spring holder 20 is inserted into an opening in the center of the frame 17.

The inner space of the cylindrical spring holder 20 communicates with the inside of the head 21, and the needle 3 is housed inside the spring holder 20 and the head 21. Inside the head 21, a head guide 22 supporting the needle 3 is arranged.

The print head 5 includes a plurality of needles 3. A plurality of rods 18 for driving the needles 3 are arranged on the frame 17, and proximal end portions of the needles 3 are connected to distal end portions 18a of the rods 18.

The print head 5 includes a plurality of driving units 16 that individually drive the rods 18. The driving unit 16 includes a core 17a provided on the frame 17, and a coil 15 attached to the core 17a via a bobbin 15 a. The core 17a is provided integrally with the frame 17 of the magnetic body. A plurality of cores 17a are arranged at predetermined intervals in the frame 17 along the circumferential direction of the frame 17, and each core 17a is positioned at the center in the width direction of the frame 17.

The lever 18 is provided at a position facing the core 17 a. Specifically, as shown in fig. 5, the distal end portion 18a of the rod 18 reaches the opening of the spring holder 20 and is coupled to the needle 3. The armature 18b, which is the central portion of the rod 18, faces the core 17a, and the base end 18c of the rod 18 reaches the vicinity of the outer periphery of the frame 17.

Further, a coil spring 20a is disposed on the spring holder 20 so as to face the rod 18. The coil spring 20a is a compression coil spring, and presses the lever 18 from the frame 17 side.

The lever 18 is rotatable about a base end portion 18c as a fulcrum, and is biased by a coil spring 20a in a state where the coil 15 is not energized, and the armature portion 18b is spaced from the core 17 a. When the coil 15 is energized, the armature portion 18b is attracted against the biasing force of the coil spring 20a by the magnetic force of the driving portion 16, and the lever 18 rotates about the base end portion 18c as a fulcrum. By the rotation of the lever 18, the distal end portion 18a of the lever 18 is moved toward the handpiece 21 together with the needle 3, and the needle 3 is projected. The operation of the lever 18 will be described in detail later.

the yoke 13, the side yoke 14, and the pressing spring 32 are fixed to the frame 17. Here, the yoke 13 can be referred to as a first yoke, and the side yoke 14 can be referred to as a second yoke. The side yoke 14 functions as a base. The pressing spring 32 is an elastic member made of an elastic material such as SUS spring material, and is a plate spring in the present embodiment.

As shown in fig. 5, the yoke 13 includes a plurality of yoke body portions 13a and a bridge portion 13b connecting the yoke body portions 13 a. The side yoke 14 includes a plurality of side yoke body portions 14a and a connecting portion 14b connecting the side yoke body portions 14 a. The yoke main body portions 13a and the side yoke main body portions 14a are, for example, the same number.

As shown in fig. 4, the plurality of rods 18 are disposed radially on the frame 17 in a state where the distal end portions 18a are exposed to the opening of the spring holder 20. Between the adjacent rods 18, the yoke main body portion 13a of the yoke 13 and the side yoke main body portion 14a of the side yoke 14 are arranged. The yoke main body portions 13a are disposed at equal intervals along the peripheral edge of the frame 17, and the side yoke main body portions 14a are disposed on the yoke main body portions 13a so as to overlap.

The pressing spring 32 is disposed so as to overlap the lever 18. The pressing spring 32 has a disc-shaped base portion 32a having an opening at the center thereof, and an extending portion 32b which is a plate body extending from the base portion 32 a. The plurality of extending portions 32b are provided so as to radially extend from the base portion 32a toward the outer periphery of the frame 17. The extending portion 32b is provided with a tilt restricting portion 32c and a slide restricting portion 32d which restrict the lever 18.

The extending portion 32b extends between the side yoke body portion 14a and the side yoke body portion 14a, and restricts movement of the lever 18 by the turn-up restricting portion 32c as described later. In other words, the base end portion 18c of the rod 18 is covered by the extension portion 32b of the pressing spring 32 between the yoke body portion 13a and the side yoke body portion 14 a.

The pressing spring 32 is positioned with respect to the spring holder 20, and is supported by the leaf spring 23 together with the lid body 19.

1-3. support structure for poles

Fig. 6 is a main part sectional view of the print head 5, and shows the proximal end portion 18c of the rod 18 and its periphery enlarged. The support structure of the lever 18 will be described with reference to fig. 5 and 6.

The base end portion 18c of the lever 18 becomes a rotation center when the lever 18 is driven. The base end portion 18c is supported by the first support portion 31. The first support portion 31 is configured to include a wear-resistant member 12, a yoke 13, and a pressing spring 32, which are disposed so as to overlap with the peripheral edge portion of the frame 17. The first support portion functions as a support portion that supports the base end portion 18 c. The pressing spring 32 functions as a restricting member, and the lift restricting portion 32c corresponds to a first restricting portion and the slide restricting portion 32d corresponds to a second restricting portion.

As described above, the lever 18 is driven by the driving unit 16, and moves the needle 3 in a direction protruding from the head 21. The moving direction of the needle 3 and the lever 18 when the needle 3 protrudes from the handpiece 21 is set as a first direction a 1. When the needle 3 is moved in the first direction a1, the coil spring 20a is compressed.

When the driving by the driving unit 16 is released, the needle 3 is moved in the direction opposite to the first direction a1 by the biasing force of the coil spring 20 a. The moving direction at this time is set as a second direction a 2. When the needle 3 is moved by a fixed amount in the second direction a2, the needle 3 is housed in the head 21.

The lever 18 is pressed by the tilt restricting portion 32c of the pressing spring 32 so as to rotate about the base end portion 18c when the needle 3 is moved in the first direction a1 and the second direction a 2.

The base end portion 18c is sandwiched by the yoke main body portion 13a from both sides in the rotational axis direction of the lever 18. Further, the bridge portion 13b of the yoke 13 and the slide restricting portion 32d are positioned between each other in the extending direction of the rod 18. The slide restricting portion 32d is formed by bending the extending portion 32b of the pressing spring 32, and is located on the peripheral edge side of the frame 17 with respect to the base end portion 18 c. Further, the base end portion 18c is positioned between the lift regulating portion 32c and the wear resistant member 12.

The wear-resistant member 12 is a disk-like member having an opening at the center, and is disposed so as to cover the peripheral edge of the frame 17, and the bridging portion 13b is disposed so as to overlap the wear-resistant member 12. The opening in the center of the wear-resistant member 12 is substantially concentric with the opening of the spring holder 20 and the base portion 32a of the pressing spring 32.

The wear-resistant member 12 is in contact with an end of the slide restricting portion 32d of the pressing spring 32.

The base end portion 18c is disposed so as to form a predetermined gap with a member constituting the first support portion 31 in a state where the needle 3 does not protrude from the handpiece 21. Specifically, the proximal end portion 18c has a hook shape, and spaces for moving the proximal end portion 18c are provided between the bridge portion 13b and the slide restricting portion 32d, and between the wear resistant member 12 and the lift restricting portion 32 c. This space may also be referred to as so-called play.

As shown in fig. 6, in a state where the base end portion 18c is in contact with the bridge 13b and the support surface 12a of the wear-resistant member 12, a gap d2 is provided between the base end portion 18c and the lift regulating portion 32 c. In the same state, a gap d1 is provided between the base end portion 18c and the slide restricting portion 32d in the width direction of the frame 17 or the extending direction of the lever 18.

the sizes of the gap d1 and the gap d2 can be appropriately set and changed within a range not interfering with the operation of the lever 18.

The protruding portion 18d of the lever 18 has a shape protruding toward a connecting portion between the tilt restricting portion 32c and the slide restricting portion 32d of the pressing spring 32. The state shown in fig. 6 is a state in which the lever 18 is rotated in the first direction a1 to project the needle 3 from the handpiece 21. In this state, a gap d2 exists between the protrusion 18d and the slide restricting portion 32d, and a gap d1 exists between the protrusion 18d and the tilt restricting portion 32 c. Therefore, in the range in which the lever 18 rotates, the protruding portion 18d does not come into contact with the tilt restricting portion 32c and the slide restricting portion 32 d.

The base end portion 18c of the rod 18 is not fixed to the first support portion 31. Therefore, when the lever 18 is driven at high speed, the lever 18 may tilt toward the tilt restricting portion 32 c. In this case, the tilt of the lever 18 is restricted by the tilt restricting portion 32 c. Further, although the lever 18 may move toward the slide restricting portion 32d during driving, in this case, the movement of the lever 18 in the direction in which it protrudes outside the frame 17 is restricted by the slide restricting portion 32 d. In this way, the lever 18 is supported by the pressing spring 32 so as not to be disengaged from the original position, and therefore, can operate stably.

The size of the gap d1 can be adjusted by the length of the slide restricting portion 32 d. That is, by adjusting the length of the slide restricting portion 32d extending from the lift restricting portion 32c, the lower end of the slide restricting portion 32d can be set in a state where it does not abut against the wear resistant member 12.

1-4. actions of the print head

In a state where the needle 3 is not operated, the lever 18 is supported by the coil spring 20a, and holds the needle 3 in a state where the needle 3 is not projected from the handpiece 21. In this state, the lever 18 is biased in the second direction a2 by the coil spring 20 a. Further, the base end portion 18c or the armature portion 18b is in contact with the tilt restricting portion 32c, and is restricted from rotating in the second direction a2 side.

When a current is supplied to the coil 15, the coil 15 is energized, thereby generating a magnetic flux. The magnetic flux passes through the core 17a and the outer periphery of the frame 17 and is transmitted to the yoke body 13 a. The magnetic flux transmitted to the yoke body 13a is transmitted to the surface of the lever 18 facing the side yoke body 14a, that is, the side surface of the lever 18 via the base end portion 18c of the lever 18 and the side yoke body 14 a.

In the rod 18, magnetic flux from the base end portion 18c and magnetic flux from the side surface flow into the core 17a of the frame 17 through the armature portion 18b, and an efficient magnetic circuit is formed. Thereby, the armature portion 18b and the base end portion 18c of the lever 18 are attracted toward the frame 17, the lever 18 rotates, and the needle 3 moves in the first direction a 1.

When the energization of the coil 15 is stopped, the lever 18 is rotated by the biasing force of the coil spring 20a, and the distal end portion 18a is moved in the second direction a2 together with the needle 3. The rotation of the lever 18 causes the tip side of the needle 3 to return into the handpiece 21.

The lever 18 rotates with the base end portion 18c held on the first support portion 31. Since the base end portion 18c is held with the gaps d1 and d2 therebetween, three or more members among the members constituting the first support portion 31 do not come into contact simultaneously when the lever 18 is rotated. This reduces the friction force generated at the base end 18c when the lever 18 is rotated, and the lever 18 is smoothly rotated. Further, since the number of members in contact with the base end portion 18c is reduced, the number of members worn by the contact is also reduced.

Further, when the base end portion 18c moves in a direction intersecting the first direction a1 or the second direction a2, the movement of the base end portion 18c is restricted by the bridge 13b or the slide restricting portion 32 d. Here, the direction intersecting the first direction a1 or the second direction a2 is, for example, the width direction of the frame 17 or the extending direction of the rod 18.

therefore, the operation of the lever 18 can be stabilized by the first support portion 31. Further, by stabilizing the operation of the lever 18, uneven wear in the members of the first support portion 31 can be prevented, and the durability of the print head 5 can be improved.

Further, even when dust or the like enters the base end portion 18c, the base end portion 18c can move, and occurrence of seizing or the like in the base end portion 18c can be suppressed.

Even if the lever 18 is excessively moved, since the pressing spring 32 is formed of an elastic member, the impact when the lever 18 and the pressing spring 32 come into contact with each other is absorbed by the elastic deformation of the pressing spring 32. This can suppress the occurrence of plastic deformation in the lever 18 and the pressing spring 32, and improve the durability of the print head 5.

The size of the gap d1 between the lever 18 and the tilt stopper 32c is adjusted by the length of the slide stopper 32d, and the gap d2 between the lever 18 and the slide stopper 32d is adjusted by the length of the tilt stopper 32 c. The pressing spring 32 is positioned with respect to the frame 17 via the spring holder 20, and the yoke 13 is positioned by contact with the frame 17. Therefore, the position of the yoke 13 with respect to the pressing spring 32 can be set with high accuracy, and the sizes of the gap d1 and the gap d2 can be set with high accuracy.

in addition, the present embodiment can be realized without increasing the number of components compared to the number of components of the conventional print head 5.

As described above, the print head 5 according to the first embodiment includes the needle 3, the lever 18, the driving unit 16, the first support unit 31, and the pressing spring 32. The needle 3 is connected to the tip 18a of the rod 18. The driving section 16 drives the lever 18. The first support portion 31 movably supports the base end portion 18c of the rod 18. The pressing spring 32 as a restricting member is disposed with predetermined gaps d1 and d2 from the rod 18, and restricts movement of the base end portion 18c of the rod 18 when the rod 18 is driven by the driving unit 16.

According to the print head 5 to which the present invention is applied and the printing apparatus 1 including the print head 5, the position of the base end portion 18c serving as the pivot of the lever 18 is maintained within a fixed range, and the operation of the lever 18 can be stabilized. This enables smooth movement of the needle 3. Further, the driving of the needle 3 can be easily speeded up. In addition, wear of the rod 18 can be suppressed.

Further, the lever 18 is driven by the driving portion 16, and the needle 3 is moved in the first direction a 1. The base end portion 18c of the rod 18 moves in the second direction a2 opposite to the first direction a1, and the pressing spring 32 restricts the movement of the base end portion 18c of the rod 18 in the second direction a 2. This suppresses tilting of the proximal end portion 18c of the rod 18, and stabilizes the operation of the rod 18.

the pressing spring 32 has a tilt restricting portion 32c located on the second direction a2 side with respect to the base end portion 18c of the lever 18, and a slide restricting portion 32d located in a direction intersecting the second direction a2 with respect to the base end portion 18c of the lever 18. The movement toward the base end portion 18c side of the rod 18 is restricted by the slide restricting portion 32 d. This stabilizes the operation of the lever 18.

The first support portion 31 has a support surface 12a that supports the base end portion 18c of the rod 18 on the first direction a1 side, and the slide restricting portion 32d of the pressing spring 32 abuts against the support surface 12 a. This allows the base end portion 18c to be received by the support surface 12a, and the operation of the lever 18 can be stabilized.

The base end 18c of the lever 18 has a protruding portion 18d facing the pressing spring 32. This allows the gap between the lever 18 and the pressing spring 32 to be set with high accuracy, and also allows the lever 18 to be more less tilted, thereby stabilizing the operation of the lever 18. In addition, the driving speed of the lever 18 can be increased.

Further, since the pressing spring 32 is an elastic member that elastically deforms in contact with the base end portion 18c of the rod 18, when the base end portion 18c of the rod 18 moves relatively large compared to the set gap, the base end portion 18c can be quickly returned to the original position by the elastic force of the pressing spring 32. This can maintain the stable operation of the lever 18.

The printing apparatus 1 includes a print head 5 and a platen 6 that conveys a printing medium, and the printing medium is conveyed by the platen 6 and printed on the printing medium 4 by the print head 5. The print head 5 includes a needle 3, a rod 18 having a distal end portion 18a connected to the needle 3, a driving portion 16 for driving the rod 18, and a first support portion 31 for movably supporting a proximal end portion 18c of the rod 18. The print head 5 includes a pressing spring 32, which is disposed so as to provide predetermined gaps d1 and d2 from the lever 18, and which restricts the movement of the base end portion 18c of the lever 18 when the lever 18 is driven by the driving unit 16.

with this configuration, the frictional force applied to the lever 18 can be reduced, and the lever 18 can be smoothly driven. In addition, tilting of the proximal end portion 18c of the rod 18 can be suppressed, and the operation of the rod 18 can be stabilized. This makes it possible to realize the printing apparatus 1 including the printing head 5 having high durability, which can perform smooth printing.

2. Second embodiment

2-1. Structure of print head

Next, a second embodiment will be explained.

Fig. 7 is a perspective view showing an internal structure of a print head 5A according to a second embodiment, and fig. 8 is a longitudinal sectional view of a main portion of the print head 5A according to the second embodiment.

The print head 5A includes the pressing spring 132 instead of the pressing spring 32 in the print head 5 described in the first embodiment. Since the configuration other than the pressing spring 132 is the same as that of the print head 5 of the first embodiment, illustration and description are omitted.

The pressing spring 132 is attached to the print head 5 in a state of being in contact with the side yoke 14.

the pressing spring 132 includes a first regulating portion 132a which is a circular plate having an opening at the center, a second regulating portion 132c and a third regulating portion 132d which radially extend from the first regulating portion 132a, similarly to the pressing spring 32. A plurality of second limiting portions 132c and third limiting portions 132d are formed on the disc-shaped first limiting portion 132 a. The second limiting portion 132c extends between the two adjacent side yoke main bodies 14a, similarly to the extending portion 32b of the first embodiment.

The base end portion 18c is supported by a second support portion 131 including the wear-resistant member 12, the yoke 13, and the pressing spring 132. The second support portion 131 functions as a support portion, and the pressing spring 132 functions as a regulating member.

The first limiting portion 132a of the pressing spring 132 is pressed against the side yoke body portion 14a via a spacer, not shown, by the cover 19, and the first limiting portion 132a is held in contact with the side yoke body portion 14 a.

The pressing spring 132 has a structure common to the pressing spring 32, except that the third regulating portion 132d has a length different from that of the slide regulating portion 32 d. The mounting structure of the pressing spring 132 is also the same as that of the pressing spring 32.

The third regulating portion 132d extends from the second regulating portion 132c toward the frame 17, and the end of the third regulating portion 132d on the frame 17 side does not contact the wear-resistant member 12.

The second limiting portion 132c and the third limiting portion 132d are arranged with a gap from the base end portion 18c of the rod 18, similarly to the pressing spring 32 of the first embodiment.

2-2. operation of the print head

In the second embodiment, the action of restricting the movement of the lever 18 by pressing the spring 132 is the same as that of the first embodiment. The second restriction portion 132c restricts the rotation of the lever 18 in the second direction a 2.

The rod 18 is rotated in a state where the base end portion 18c is held by the second support portion 131, and during this rotation, the base end portion 18c abuts only one of the members constituting the second support portion 131 which is opposed to the other. Thereby, the lever 18 is smoothly rotated, and the worn components are also reduced.

Even when the base end portion 18c of the rod 18 is tilted, the movable range of the base end portion 18c is limited by the members constituting the second support portion 131. When the base end portion 18c of the rod 18 moves in the first direction a1 or the second direction a2, the base end portion contacts the wear-resistant member 12 or the second stopper 132c, and the movement of the base end portion 18c is restricted within the set gap range.

When the lever 18 is moved in a direction intersecting the first direction a1 and the second direction a2, the base end portion 18c abuts against the bridge 13b or the third limiting portion 132 d. Therefore, the movement of the base end portion 18c is restricted within the range of the set gap.

therefore, the second support portion 131 stabilizes the operation of the lever 18, prevents uneven wear in the components of the second support portion 131, and improves the durability of the print head 5A.

further, even when dust or the like enters the base end portion 18, the base end portion 18c can move, and occurrence of seizing or the like in the base end portion 18c can be suppressed. Since the wear-resistant member 12 and the third regulating portion 132d do not contact each other, dust and the like can be discharged from between the wear-resistant member 12 and the third regulating portion 132 d.

Even if the lever 18 is excessively moved, the pressing spring 132 is formed of an elastic member, and thus absorbs the impact at the time of contact by elastic deformation. This can improve the durability of the print head 5A.

the size of the gap between the rod 18 and the second limiting portion 132c is adjusted by the distance from the contact surface between the first limiting portion 132a of the pressing spring 132 and the side yoke body portion 14a to the protruding portion 18d provided on the base end portion 18c of the rod 18. Further, a spacer may be disposed between the pressing spring 132 and the side yoke body 14a, so that the distance of the gap between the protruding portion 18d and the second regulating portion 132c can be adjusted.

Therefore, the size of the gap between the rod 18 and the second regulating portion 132c can be set with high accuracy, and the size of the gap can be easily maintained. Further, the size of the gap between the lever 18 and the third limiting portion 132d can be set with high accuracy, and the size of the gap can be easily maintained.

This can improve the durability of the print head 5A without increasing the number of components as compared with the conventional apparatus.

As described above, the print head 5A according to the second embodiment includes the side yoke 14 as a base disposed between the adjacent rods 18, and the first limiting portion 132a of the pressing spring 132 abuts against the side yoke 14.

According to the printing apparatus 1 including the print head 5A, the size of the gap between the pressing spring 132 and the rod 18 can be set with high accuracy by adjusting the distance from the contact surface of the side yoke 14 with the first regulating portion 132a to the frame 17. Moreover, the tilting of the lever 18 is restricted, so that the operation of the lever 18 can be stabilized.

The above embodiments are merely embodiments showing one embodiment of the present invention, and the specific embodiments of the present invention and the application range of the present invention are not limited to the above embodiments.

For example, in the pressing spring 132 described in the second embodiment, the first regulating portion 132a of the annular plate may be formed by a larger annular plate. In this case, the second limiting portion 132c may be formed in a cylindrical shape connected to the outer peripheral portion of the annular plate body, and may be configured to cover the side yoke 14 disposed on the outer peripheral portion of the frame 17.

The number of the pins 3 provided in the print heads 5 and 5A is not limited, and can be changed as appropriate, and the same applies to the number of the rods 18 and the coil springs 20a corresponding to the number of the pins 3. The form of the print medium 4 printed by the printing apparatus 1 is not limited, and a configuration using continuous paper, roll paper, cut sheet paper, or the like is possible.

The printing apparatus 1 may be configured as a stand-alone apparatus as shown in fig. 1, or may be configured to be incorporated into an apparatus such as an ATM (Automatic Teller Machine).

The detailed configurations of the other printing apparatus 1 and the printing heads 5 and 5A can be modified as appropriate without departing from the scope of the present invention.

Description of the symbols

1 … printing device; 3 … needles; 4 … print media; 5 … print head; 6 … platen; 12 … wear resistant parts; 12a … bearing surface; 13 … a magnetic yoke; 13a … yoke body portion; 13b … bridge; 14 … side yoke (base); 14a … side yoke main body portion; 14b … connection; 15 … coil; 15a … coil former; 16 … a drive part; 17 … a frame; 17a … iron core; 18 … a rod; 18a … top end portion; 18b … armature portion; 18c … base end portion; 18d … projection; 19 … a cover; 20 … spring support; 20a … spring; 23 … leaf spring; 24 … a substrate; 31 … first supporting part (supporting part); 32 … pressing spring (restricting member); 32a … base; 32b … extensions; a 32c … tilt restricting portion (first restricting portion); a 32d … slide restricting portion (second restricting portion); 131 … second support part (support part); 132 … pressing spring (restricting member); 132a … first restriction; 132c … second restriction; 132d … third limiting part; d1, d2 … gap.