JPH028761Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a printing device using a type drum.

A type drum type printing device, that is, a printing device in which a large number of type bodies are provided around the outer periphery of a cylindrical drum, the type drum is rotated and moved in the axial direction to select the type, and printing is performed with a hammer has been known for some time. ing.

Although this type drum type printing device has the advantages of clear printing and low cost, there is a limit to the number of characters that can be placed on the outer circumferential surface of the type drum, so the type that you want to print cannot be printed. There are inconveniences such as the inconvenience of not being able to print a document with fonts that may not be on the drum, or if it is necessary to print a document with fonts of different sizes.

The above problem can be quickly solved by replacing the type drum of the printing device, for example by making the type drum warped and replacing it with a type drum with a different number of type, but normally the type drum is attached to its axis. Since the type drum is irremovably supported on the support frame by a shaft that passes through the heart, or is supported with both ends sandwiched between the U-shaped support frames, replacing the type drum can be done easily. The work was as troublesome and difficult as disassembly, and replacing the type drum was not a practical solution.

Therefore, in this invention, the support frame is not U-shaped to sandwich the type drum as described above, but has a side plate only on one side of the type drum, and a receiving roller for supporting the outer periphery of the type drum on the other side. In addition to the frame, either the connection between the penetrating shaft of the type drum and the type drum or the connection between the penetrating shaft and the side plate is removably connected; By providing a connecting operating handle, it is possible to extremely easily replace the type drum as described above, thereby solving the inconvenience of the type drum type printing device as described above. .

Hereinafter, an embodiment of this invention will be described in detail regarding a printing device of a type in which a motor is built into a type drum.

In the figure, reference numeral 1 denotes a support frame on which a type drum 2 is supported, and a support roller 4 for a guide shaft 3 and a screw member 6 screwed to a helical shaft 5 are attached to the lower part of the support frame 1. When the helical shaft 5 rotates, the entire support frame 1 on which the type drum 2 is mounted moves laterally along the guide shaft 3.

This support frame 1 consists of a bottom plate 7 and a right side plate 8, and the left end of the bottom plate 7 has a receiving surface for the type drum 2, which has a substantially V-shaped receiving surface that matches the outer circumference of the type drum 2. A plate 9 is formed, and the receiving plate 9 is provided with a receiving roller 11 for supporting the outer periphery of the type drum 2.

The side plate 8 has a shaft support 12 on the bottom plate 7 so that it can be raised and lowered freely, and a tension spring 13 is stretched between the bottom plate 7 at a proper position and the side plate 8 at a proper position as shown in FIG. It is designed to be stable in either the standing or lying position (solid line and chain line in Figure 1). 14 is a stopper in the direction of lodging.

A motor 15 is mounted on this side plate 8 in the following manner.

That is, this side plate 8 is formed with a cylindrical portion 8a, a step motor 15 is fixed 16 at the tip of the cylindrical portion 8a, and a ball bearing 17 is fitted around the outer periphery of the cylindrical portion 8a. It has been done.

A rotary encoder 18 is connected to the rotary shaft 19 of the step motor 15 via an Oldham coupling 21.

The step motor 15 is supported by the frame side plate 8 as described above, and the type drum 2 is mounted to cover the step motor 15.

Next, the type drum 2 will be explained. The type drum 2 in this example is a hollow cylindrical body with a large opening on one side, and one end member 22a of an Oldham coupling 22 is fixed to the center of the side plate 2a on the closed side 23.
A through hole 24 is provided in the center of the one end member 22a, and the type drum 2 is inserted in the direction of piercing the rotating shaft 19 of the step motor 15 (in the direction of the upper arrow A in FIG. 1). It is installed as follows.

That is, the rotating shaft 1 of the step motor 15
9 has a threaded portion 19a formed at its elongated tip, and an Oldham coupling 2 at its proximal end.
2, and the intermediate member 22b of the Oldham coupling 22 is slidably inserted into the tip of the other end member 22c.

Therefore, the through hole 24 of the one end member 22a provided on the type drum 2 is connected to the above-mentioned rotating shaft 1.
The other end member 22c, which is fixed to the rotation shaft 19, is inserted so as to be penetrated by the shaft 19, and rotated appropriately to engage the unevenness of each member 22a, 22b, 22c.
and one end member 22a are connected via an intermediate member 22b, so that the type drum 2 is operatively connected to the motor 15.

Reference numeral 25 denotes a hand handle screwed onto a threaded portion 19a at the end of the rotating shaft 19. By screwing the handle 25, the members 22a, 22b, 22c can be rotated.
The connection is securely fixed.

Reference numeral 26 denotes an inward flange provided on the opening side of the type drum 2, and when the type drum 2 is installed, a stepped portion 26a on the inner circumferential surface of the flange 26 accurately fits into the outer periphery of the ball bearing 17. There is.

27 is an annular gear into which the positioning pawl 28 of the type drum 2 engages, and 29 is a solenoid for urging the positioning pawl 28 provided on the receiving plate 9.

Since the printing apparatus of this embodiment is constructed as described above, the type drum 2 installed in the state shown in FIG. 1 can be replaced in the following manner.

That is, first, the type drum 2 is lifted obliquely so that the side plate 8 is brought into the state shown by the chain line in FIG. 1 against the force of the spring 13, and the type drum 2 is held upright.

In this state, the side plate 8 is pulled by the spring 13 and stabilized in the state shown by the chain line in FIG. ,2
2b and 22c can be separated, and the type drum 2
can be pulled upwards.

Once the type drum 2 has been extracted in the manner described above, another type drum 2 is then mounted in substantially the reverse order to the order in which the type drum 2 is extracted.

That is, as described above, the through hole 24 of the one end member 22a provided on the type drum 2 is connected to the motor 1.
5, and then rotate the type drum 2 so that the characters on the type drum 2 are in the correct position to smooth out the unevenness of each member 22a, 22b, 22c of the coupling. Bite together.

At this time, in this embodiment, since the Oldham coupling 22 whose recesses and projections engage with each other is used as the removable coupling coupling 22, the positioning of the type drum 2 with respect to the step motor 15 is also performed at the same time. Further, the mounting position of the type drum 2 in the axial direction is at the stepped portion 26 of the flange 26, as described above.
This is done by fitting a into the outer periphery of the ball bearing 17.

Once the coupling ring 22 has been connected as described above, the handle 25 is screwed onto the rotating shaft 19 and the coupling of the coupling ring 22 is fixed, so that the type drum 2 is reliably coupled to the rotating shaft 19. Therefore, if the type drum 2 is then laid down and supported on the roller 11 that receives the outer periphery of the left end, the side plate 8 will be in the upright state as shown by the solid line in FIG.
3 exerts a downward biasing force on the type drum 2 in the direction of the receiving roller 11, so that the type drum 2 is stably supported on the receiving roller 11.

As described above, the printing device of this embodiment is of a compact type in which the motor 15 is housed inside the type drum 2, and since the rotating shaft 19 and the type drum 2 are directly connected, the rotation angle of the motor 15 is There is no deviation in the rotation angle of the type drum 2,
It has the advantage that the positioning of the type drum 2 can be performed extremely accurately, and in addition to eliminating the side plate on one side, the side plate 8 can be freely raised and folded, so that when replacing the type drum 2, the type drum 2 can be easily positioned. The side plate 8
This design has the advantage that it can be easily replaced as it can be made to stand upright, but this invention is not limited to the above embodiment; for example, as shown schematically in Figure 4, , motor 15
is provided on the support frame 1, and the rotating shaft 31 is supported in a cantilevered manner on the side plate 8 of the support frame 1, and the chain 32 and sprocket wheel 3 are
3, the rotary shaft 31 may be rotated through the handle 25. In this case, the detachable coupling ring 22 can be separated by turning the handle 25, and the type drum 2 can be pulled out to the side. However, since there is no side plate on one side of the support frame 1, the type drum 2 can be freely inserted and removed from the side.

Further, as schematically shown in FIG. 5, the shaft is a fixed shaft 34 supported in a cantilevered manner by the side plate 8 of the support frame 1, and the type drum 2 is connected to the receiving roller 11 at one end of the support frame 1 and the shaft 34. The motor 15 on the support frame 1 directly supports the motor 15 on the support frame 1, and
The outer periphery of the type drum 2 may be rotated; in this case, the shaft 34 fixed to the side plate 8 is not a rotating shaft, so the connection between the end of the shaft 34 and the type drum 2 is as follows. There is.

That is, the shaft 34 has a flange portion 3 for fastening.
6 is fitted and fixed, and its tip has a threaded portion 37.
The center hole of a ball bearing 38 provided on the type drum 2 side is inserted into the shaft 34, and a handle 3 with a screw is inserted.
9 is screwed into the end of the shaft 34, the type drum 2 is sandwiched between the flange portion 36 and the handle 39, and the position is set, completing the installation.

In this case, since the shaft 34 is not a rotating shaft, the side plate 8
The structure of the mounting portion 41 to be simplified.

Furthermore, as schematically shown in FIG. 6, when the shaft 42 passing through the type drum 2 is fixed to the type drum 2, the following will occur.

That is, in this case, a ball bearing 43 for supporting the through shaft 42 is installed inside the cylindrical portion 8a of the side plate 8.
A ball bearing 44 for supporting the type drum 2 is attached to the outside, and the through shaft 42 to which the type drum 2 is fixed 45 passes through the center hole of the ball bearing 43. The flange portion 46 on the through shaft 42 is the cylindrical portion 8a.
When the handle 47 is screwed into the threaded portion 48 at the end of the shaft 42, the shaft 42 of the type drum 2 is brought into contact with the flange 4, similarly to the embodiment shown in FIG.
6 and the handle 47 to set the position and complete the installation.

In this case, since the handle 47 is provided on the side plate 8 side, the opposite side of the side plate 8, that is, the left side surface of the type drum 2, can have a structure without any protruding part.

In any case, as is clear from the above explanation, in the printing device of this invention, the support frame is not U-shaped so as to sandwich the type drum from both sides, but has a side plate on one side and a side plate on the other side. The frame has a receiving roller that supports the outer periphery of the type drum, and a connection between the type drum and a through shaft passing through the axis of the type drum, or a connection between the through shaft and the side plate. Since one of the two is connected in a detachable manner, and an operating handle is provided for the detachable connecting portion, the connecting portion can be easily engaged and detached by operating the operating handle.
When the connecting portion is separated, the type drum can be freely inserted and removed in the direction along its through axis without being obstructed by the side plate, and the type drum can be replaced easily and quickly.

Therefore, the printing device of this invention can eliminate the inconveniences inherent in drum-type printing devices as mentioned at the beginning.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view showing an embodiment of this invention, Fig. 2 is a left side view, Fig. 3 is a perspective view showing the connection structure between the type drum and the motor, and Figs. 4 to 6 are respectively FIG. 7 is a schematic longitudinal sectional front view showing another embodiment. 1...Support frame, 2...Type drum, 8...
... Side plate, 11 ... Reception roller, 19 ... Rotating shaft (through shaft), 22 ... Oldham coupling (removable connection), 25 ... Operation handle.

Claims (1)

[Scope of utility model registration request] It consists of a type drum with a large number of type bodies on its outer circumferential surface, a support frame having a side plate located on one side of the type drum, and a receiving roller located on the other side of the type drum, and the axis of the type drum is A printing device in which a shaft penetrating through the shaft is supported in a cantilevered manner on the side plate, and an outer periphery of one end of the type drum is supported on the receiving roller, thereby making the type drum rotatable relative to the support frame. is irremovably supported on the side plate and the through shaft and the type drum are removably connected, or the through shaft is irremovably supported on the type drum and the through shaft and the side plate are removably connected. A printing device characterized in that the printing device is provided with an operation handle for the connecting portion which is connected and can be freely engaged and detached.