JPH051412Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a printing hammer device that is attached to a type impact type printing device and prints by striking a type element that has been rotated to a printing position.

[Prior Art] A conventional printing hammer device includes a pair of front and rear bearing members that movably support the striking end and non-striking end of the printing hammer, and a coil that magnetically drives the printing hammer, in a case. A coil bobbin that is wound and has a printing hammer inserted through a through hole in the center, an elastic member that returns the magnetically driven printing hammer to its initial position, and a front and rear pair that forms a magnetic path for magnetically driving the printing hammer. A yoke member etc. are attached. When an excitation current with a required impact force corresponding to the type area of the type element rotated to the printing position is applied to the coil, the printing hammer is activated by the magnetic field generated in the magnetic path leading to the yoke member of the case and the printing hammer. Printing is performed by moving toward the type element against the elastic force of the elastic member and striking the type element with a required impact force.

[Problems to be solved by the invention] However, since the conventional printing hammer device described above has many components, the printing hammer, a pair of front and rear bearing members, a pair of front and rear yoke members, a coil bobbin, etc. are installed inside the case. It was difficult to install them with high concentricity. For this reason, the sliding resistance of the printing hammer with respect to each part becomes uneven, and the printing element cannot be hit with the required impact force, resulting in a problem of poor printing quality. Furthermore, a large number of parts had to be mounted in a highly concentric manner within the case, resulting in an increase in the size of the device and poor assembly work efficiency.

[Purpose of the invention] In view of the above-mentioned conventional drawbacks, the purpose of the invention is to
It is possible to install each part in the case with high concentricity, and the printing hammer can be reliably driven with the required impact force to obtain high printing quality and improve the efficiency of assembly work. The purpose of the present invention is to provide a hammer device.

[Means for Solving the Problems] Therefore, the present invention provides a printing hammer that strikes a type element with its striking end, and a front end bearing and a rear end that movably support at least the striking end of the printing hammer. The inner surface of the printing hammer has a stepped portion having a larger diameter than the non-impacting end of the printing hammer, and faces the rear outer periphery at a predetermined interval in the axial direction, and extends in the radial direction with a predetermined outer diameter. a bearing member integrally formed with a pair of flanges, a coil wound around the outer periphery of the bearing member between the flanges, an elastic member that returns the magnetically driven printing hammer to its initial position, and the printing hammer It is characterized by comprising a hammer receiver that comes into contact with the non-striking side end of the printing hammer when it returns to the initial position.

[Operation of the invention] Since the present invention is constructed as described above, by assembling the printing hammer with at least the striking side end supported by the front end bearing part with respect to the bearing member,
Assembling efficiency can be improved, and the sliding resistance of the printing hammer relative to the bearing member can be made almost uniform, enabling high-quality printing. Further, by forming an electromagnet by winding a coil between the flange parts integrally formed on the bearing member, the magnetic driving force for the printing hammer can be made almost constant. This makes it possible to hit the type elements with the required impact force and obtain high print quality. Further, it is possible to reduce the number of parts constituting the printing hammer device, thereby reducing the size of the device and improving assembly work efficiency. At this time, since the coil bobbin that supports the coil that generates heat during use is constructed integrally with the bearing member, the vicinity of the coil bobbin expands thermally, but the printing hammer is not tightened due to the existence of the void. Therefore, stable operation is possible even during long-term use.

[Example] An example of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic perspective view showing an outline of a type impact type printing device to which a printing hammer device according to the present invention is attached, and shows a pair of left and right frames (not shown) in a type impact type printing device 1.
A platen 3 is rotatably supported between them.
The platen 3 is driven by a connected platen drive motor (not shown) and print paper 5 is mounted thereon.
feed the paper. Two guide shafts 7 are horizontally suspended between the frames parallel to the axis of the platen 3,
A carriage 9 forming a part of the moving member 8 is supported on the guide shaft 7 so as to be slidable in the axial direction thereof. The carriage 9 is moved parallel to the printing lines on the platen 3 by the drive of a connected carriage drive motor (not shown). A type selection motor 11 such as a step motor, which constitutes a part of the moving member 8, is mounted on the carriage 9, and a type wheel housed in a wheel cassette (not shown) is mounted on the rotation axis of the type selection motor 11. 13 are attached replaceably. The type wheel 13
consists of a boss 13a into which the rotating shaft is inserted, a number of arms 13b extending radially from the outer periphery of the boss 13a, and a type element 13c formed at the tip of each arm 13b. When the type selection motor 11 is driven by a required number of steps according to the print data, the type element 13c corresponding to the print data is selectively rotated to a print position facing the print line on the platen 3. A printing hammer device 1, which will be described later, is provided on the upper surface of the type selection motor 11.
5 is screwed through a holder 16. The printing hammer device 15 strikes the printing element 13c, which has been rotated to the printing position, onto the printing paper 5 with a required impact force via a printing ribbon, which will be described later. A ribbon cassette (not shown) is replaceably mounted on the carriage 9, and a printing ribbon (not shown) is folded and accommodated in the ribbon cassette. Between both arms of the ribbon cassette extending toward the platen 3, a printing ribbon is placed between the platen 3 and the type element 1.
3c.

FIG. 2 is an exploded perspective view of the printing hammer device 15, and FIG. 3 is a central vertical sectional view of the assembled printing hammer device 15. The case member 17 of the printing hammer device 15 is a metal plate, and the front plate 19 and A pair of upper and lower support plates 21 are integrally bent. An opening 19b having a pair of upper and lower positioning notches 19a is formed in the front plate 19, and a striking side end of a bearing member 25, which will be described later, is inserted into the notches 19a and the opening 19b. Further, a pair of through holes 1 for positioning are provided on both sides of the opening 19b in the front plate 19.
9c is formed. Furthermore, a pair of screw holes 19d into which the holder 16 is screwed are formed on both sides of the through hole 19c in the front plate 19. Each support plate 21 is bent so as to face the upper and lower ends of the front plate 19 at a required interval and extend in a direction opposite to the platen 3 (hereinafter referred to as rearward). A hooking notch 21a is formed on both sides of the rear end of each support plate 21.
Note that the rear end of the support plate 21 is an open end.

A bearing member 25 made of synthetic resin is inserted into the case member 17 from the open end of the support plate 21 . On the striking side of the bearing member 25, a pair of upper and lower arm portions 25a extending toward the platen 3 and fitting into the notch 19a, and a front end bearing portion 25b fitting into the opening 19b are integrally molded. A shaft support hole 25c is formed in the center of the bearing portion 25b. On the non-impact side of the bearing member 25, there is a rear end bearing part 25d continuous with the arm part 25a, and a pair of front and rear bearing parts facing each other at a required interval on the outer periphery of the rear end bearing part 25d and forming a coil bobbin. Tsuba 25
e are integrally molded, and a shaft support hole 25f is formed in the center of the rear end bearing portion 25d. A step portion 25g having an inner diameter larger than that of the shaft support hole 25f is formed on the inner circumferential surface of the shaft support hole 25f on the impact side. A coil 27 is wound around the outer peripheral surface of the rear end bearing portion 25d between the collar portions 25e, and constitutes an electromagnet. A pair of pins 25h that match the through holes 19c are integrally molded on the front end surface of the flange 25e located at the front. In addition, the flange 25 located at the rear
A pair of pins 25i that correspond to through holes 33b, which will be described later, are integrally molded on the rear end surface of e. The stepped portion 25g forms a relief when the rear end bearing portion 25d expands and deforms due to heat generation of the coil 27 due to excitation, and prevents an increase in sliding resistance with the printing hammer 29, which will be described later. There is.

A printing hammer 29 made of a magnetic material is inserted into the bearing member 25 . The printing hammer 29 is composed of a striking part 29a and a shaft part 29b, and the striking part 29a is inserted into the shaft support hole 25c of the front end bearing part 25b.
Furthermore, the shaft portions 29b are slidably supported in respective shaft support holes 25f of the rear end bearing portion 25d. A hole 29c is formed in the center of the shaft portion 29b so as to extend from the rear end toward a part of the striking portion 29a, and the hole 29c reduces the mass of the printing hammer 29 and increases its striking response. ing.

A compression spring 31 as an elastic member is attached between the front end bearing portion 25b and the shaft portion 29b, and the front end bearing portion 25b side of the compression spring 31 is attached to the shaft portion 2.
It is wound in a conical shape with a larger diameter from the side 9b, and its elastic force always urges the printing hammer 29 to the initial position.

A yoke member 33 made of a magnetic material is inserted into the case member 17 from the open end of each support plate 21 at the rear end side of the collar portion 25e located at the rear. A through hole 33a is formed in the center of the yoke member 33, and the through hole 33a substantially coincides with the shaft support hole 25f.
The shaft portion 29b of the printing hammer 29 is inserted into the inside 3a. Further, the yoke member 33 has a pair of through holes 33b.
is formed corresponding to the pin 25i, and the pin 25i is inserted into the through hole 33b when the printing hammer device 15 is assembled. The yoke member 33 forms a magnetic path together with the case member 17 and the printing hammer 29.

A hammer receiver 35 is attached to the rear end surface of the yoke member 33 via a rubber plate 37. This hammer receiver 35 is a magnetically driven printing hammer 2.
9 has a mass sufficient to absorb the return energy when it returns to the initial position side by the elastic force of the compression spring 31, and has a flat portion 35a and a flat portion 35a.
It is formed into a cup shape with a concave portion 35b extending rearward from the center of the hole. A pair of through holes 35c that match the pins 25i are formed in the flat portion 35a, and the hammer receiver 35 is movably supported by the pin 25i inserted into the through holes 35c. is positioned. Further, a resin plate 35d is press-fitted into the recess 35b.

A shock absorbing rubber member 39 is attached to the outer peripheral surface of the recess 35b. This shock absorbing rubber member 39 is formed in a shape having a small diameter portion 39a on its front end side and a large diameter portion 39b having an outer diameter corresponding to the hammer receiver 35 on its rear end side.

The support member 41 that supports the bearing member 25, the printing hammer 29, the yoke member 33, and the hammer receiver 35 in the case member 17 is a plate spring, and includes a pair of outer peripheral portions 41a, a pair of elastic arms 41b, and a pair of hanging legs. 4
1c is stamped and formed. Each outer circumferential portion 41a is bent so that its middle portion contacts the rear end surface of the large diameter portion 39b of the shock absorbing rubber body 39 toward the front. Each elastic arm 41b is bent so that its tip comes into contact with the large diameter portion 39b of the shock absorbing rubber body 39 and the rear end surface of the hammer receiver 35, respectively. Each of the locking legs 41c is bent forward from the base end of the outer circumferential portion 41a and the elastic arm 41b along the outer surface of the support plate 21, and the front end of each of the locking legs 41c has the notch 21.
A latching piece 41d that is latched to a is formed by punching.

Next, the printing hammer device 1 configured as described above
The method of assembling No. 5 will be explained with reference to FIG.

In FIG. 2, the bearing member 25 is inserted from the open end of each support plate 21, and the arm portion 25a is inserted into the notch 19.
Open the hole 19 in the front end bearing part 25b in a state that corresponds to a.
Insert it into b. At this time, the pin 25h of the collar portion 25e located at the front is inserted into the through hole 19c, and the case member 17 and the bearing member 25 are positioned.
Next, the printing hammer 29 with the compression spring 31 attached to the striking part 29a is inserted into the bearing member 25, and the striking part 29a is inserted into the shaft support hole 25c of the front end bearing part 25b.
Furthermore, the shaft portions 29b are slidably supported in the shaft support holes 25f of the rear end bearing portion 25d.

In the above state, the yoke member 33 is attached to the rear end surface of the collar portion 25e located at the rear such that the non-striking side end of the shaft portion 29b is inserted into the through hole 33a. At this time, the pin 25i of the flange 25e located at the rear is inserted into the through hole 33b, and the bearing member 25 and the yoke member 33 are positioned.

Next, with respect to the yoke member 33 in the above state,
A hammer receiver 35 having a shock absorbing rubber member 39 attached to the outer peripheral surface of the recess 35b is attached so that the non-impact side end of the shaft 29b is inserted into the recess 35b. At this time, the pin 25i protruding from the rear end surface of the rubber plate 37 is inserted into the through hole 35c, and the yoke member 33 and the hammer receiver 35 are positioned.

Next, the hammer receiver 35 installed as described above
The latching leg 41c of the support member 41 is attached from behind so that the latching piece 41d of the latching leg 41c engages with the notch 21a of the support plate 21. At this time, the outer peripheral portion 41a abuts the rear end surface of the large diameter portion 39b, and the elastic arm 41b abuts the large diameter portion 39b and the rear end surface of the hammer receiver 35, respectively, and their elastic force causes the hammer receiver 35 to move forward. A bearing member 25, a printing hammer 29, a compression spring 31, a yoke member 33, and a hammer receiver 35 are supported within the case member 17 for the purpose of applying force.
In this state, the non-impacting end of the printing hammer 29 comes into contact with the resin plate 35d in the recess 35b due to the elastic force of the compression spring 31, and the printing hammer 29 is located at the initial position.

The printing hammer device 15 assembled as described above is fixed to the holder 16 attached to the upper surface of the type selection motor 11 by a fixing screw (not shown) screwed into the screw hole 19d of the front plate 19. .

Next, the operation of the printing hammer device 15 assembled as described above will be explained with reference to FIGS. 3 and 4.

In FIG. 3, when no excitation current is applied to the coil 27, the printing hammer 29 is moved by the compression spring 3.
1 to the initial position shown in FIG.
It is inserted into the interior and abuts against the resin plate 35d.

In FIG. 4 showing the driving state of the printing hammer device 15, when an excitation current is applied to the coil 27, a magnetic field is generated by the magnetic path formed between the case member 17, the yoke member 33, and the printing hammer 29. The magnetic field causes the printing hammer 29 to compress the compression spring 3.
It is magnetically driven in the direction of the solid line arrow shown in FIG. 4 from the initial position shown in FIG. 3 against the elastic force of 1. As a result, the printing hammer 29 hits the printing element 13c, which has been rotated to the printing position based on the printing data, against the printing paper 5 via the printing ribbon with the required impact force, so that the printing data is converted into a printing impact format. It will be printed.

When the coil 27 is de-energized with the printing operation, the printing hammer 29 returns to the initial position due to the elastic force of the compression spring 31, and the non-impacting end of the shaft 29b inserted into the recess 35b , collides with the hammer receiver 35 with return energy according to the elastic force of the compression spring 31, and moves the hammer receiver 35 to the non-impacting side. At this time, the shock absorbing rubber member 3
Since the outer peripheral portion 41a and the elastic arm 41b of the support member 41 are in contact with the rear end surface of the support member 41, as the hammer receiver 35 moves, the shock absorbing rubber member 39,
In particular, the small diameter portion 39a is largely elastically deformed, and the spring force of the outer peripheral portion 41a and the elastic arm 41b cushions the movement of the hammer receiver 35 and absorbs the return energy of the printing hammer 29. Also,
Since the elastic arm 41b is in contact with the rear end surface of the hammer receiver 35, the shock absorbing rubber member 39 acts as a buffer, and the spring force of the elastic arm 41b cushions the movement of the hammer receiver 35. It absorbs return energy. Then, by the elastic force of the shock absorbing rubber member 39 and the spring force of the outer circumferential portion 41a and the elastic arm 41b, the hammer receiver 35 is returned until it comes into contact with the rubber plate 37, and the printing hammer 29 is stabilized at the initial position.

In this way, in this embodiment, the pair of front and rear flanges 25e constituting the coil bobbin are integrally molded on the outer periphery of the rear end bearing portion 25 of the bearing member 25, so that the front end bearing portion 25b, the rear end bearing portion 25d, and the coil bobbin are The printing hammer 29 can be mounted in the case member 17 with high concentricity, and the printing hammer 29 can be attached to the coil bobbin.
The printing hammer 29 can be magnetically driven by making the sliding resistance substantially uniform. Thereby, the type element 13c rotated to the printing position is reliably struck with the required impact force, and high printing quality can be obtained. Further, by reducing the number of components of the printing hammer device 15, it is possible to downsize the device and improve assembly work efficiency.

[Effects of the invention] As described above, the present invention makes it possible to mount each component within the case with high concentricity, and ensures high printing quality by driving the printing hammer with the required impact force. It is possible to provide a printing hammer device that can improve the efficiency of assembly work.

[Brief explanation of the drawing]

Fig. 1 is a schematic perspective view showing an outline of a type impact type printing device to which a printing hammer device according to the present invention is attached, Fig. 2 is an exploded perspective view of the printing hammer device, and Fig. 3 is an assembled printing device. FIG. 4 is a central vertical cross-sectional view of the hammer device, showing the driving state of the printing hammer device. In the figure, 13c is a type element, 15 is a printing hammer device, 25 is a bearing member, 25b is a front end bearing part, 25
d is a rear end bearing portion, 25e is a flange portion constituting a coil bobbin, 27 is a coil, 29 is a printing hammer, 31
35 is a compression spring as an elastic member, and 35 is a hammer receiver.

Claims (1)

[Claims for Utility Model Registration] A printing hammer that strikes a type element with its striking end, and a front end bearing movably supporting at least the striking end of the printing hammer, and a non-contact part of the printing hammer on the inner surface of its rear end. It has a stepped part with a larger diameter than the striking side end, and is integrally formed with a pair of front and rear flanges that face each other at a predetermined distance in the axial direction on the rear outer periphery and extend in the radial direction with a predetermined outer diameter. the formed bearing member; a coil wound around the outer periphery of the bearing member between the flange portions; an elastic member for returning the magnetically driven printing hammer to its initial position; and an elastic member for returning the printing hammer to its initial position. A printing hammer device comprising: a hammer receiver that comes into contact with a non-striking end of a printing hammer;