JPS5912475B2 - printing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing device in a character selection type printing machine, which has a stop mechanism for stopping and positioning a reciprocating shaft that engages with type and reciprocates.

The present invention relates to a character selection type printing machine, in which a first stopper (hereinafter referred to as S20 top lever) for stopping and positioning a reciprocating shaft that engages with type and reciprocates, and a second stopper. (Hereinafter, in the main text, this will be expressed as two parts: a stopper pin, which is a shaft part, and a stopper, which is an elastic part arranged on the outer periphery of the stopper pin.) This invention relates to a printing device intended to facilitate installation.

An object of the present invention is to provide a stop mechanism for stopping and positioning a reciprocating shaft that engages with type and reciprocatingly rotates in a character selection type printing machine. or by arranging a stopper with a stopper attached to the reciprocating rotation shaft, or by making the contact state between the stop lever fixed to the reciprocating rotation shaft and the stopper engaged with the stop lever in a diagonal direction with respect to the direction of the collision force. Therefore, it is an object of the present invention to provide a printing device that disperses collision energy, reduces stress concentration, and has a commensurately small female top mechanism.

Another object of the present invention is to provide a stop lever fixed to the reciprocating shaft and a stop lever in a stop mechanism for stopping and positioning a reciprocating shaft that engages with the type of a character selection type printing machine and reciprocates. This printing device improves the reliability of the stop mechanism by making the contact state of the stopper engaged with the stopper in a direction diagonal to the direction of the collision force, and further rotating the stopper to move the contact position between the stop lever and the stopper. The goal is to provide

Still another object of the present invention is to provide a stop lever fixed to the reciprocating shaft, or By making the stopper that engages with the stop lever a material with a large amount of elastic deformation, such as rubber or plastic, it is possible to gradually absorb the collision energy and further reduce the bounce of the stop lever and stopper. The purpose is to provide a printing device.

Still another object of the present invention is to provide a stop lever fixed to the reciprocating shaft in a stop mechanism for stopping and positioning a reciprocating shaft that engages with type and reciprocates in a reciprocating rotary motion of a character selection type printing machine. The workability of assembly can be improved by making the engaging stopper a material with a large amount of elastic deformation, such as rubber or plastic, or by arranging the stopper with a space between the stopper pin that is fixed to the frame and its outer periphery. An object of the present invention is to provide a printing device that is easy to use.

The present invention will be explained using a specific example shown in FIG. In the figure, 20 is a reciprocating rotating shaft having a notch 21 along the thrust direction, 22 is a large number of type wheels arranged on the reciprocating rotating shaft 20, each with type 23 on the outer periphery and saw teeth on the side. A sleeve 27 having a stopper portion 25 protruding from the outer diameter of the serrated teeth 24 and an opening 26 in a portion on the inner periphery is provided. Furthermore, a groove 28 is provided on the side surface of the type ring 22 between the serrations 24 and the sleeve 27 to accommodate a spring member to be described later. Reference numeral 29 denotes a spring member which is removably loaded into the groove 28 of the type ring and has a shape in which a portion projects into the opening 26 of the sleeve 27, and the protrusion 61 engages with the notch 21 during standby.

30 to 37 are parts constituting an example of a type wheel selection means,
Reference numeral 30 denotes a selection lever supported by a shaft 31, and 32 a stopper for determining the standby position of the selection lever 30, which is mounted on the frame of the printing device or the like.

A screw recoil spring 33 has one end hooked to the selection lever 30 and the other end hooked to a shaft 34 mounted on the frame, which provides two stable positions for the selection lever 30 during standby and operation.

35 is an electromagnet, and 36 is a suction plate fixed to the selection lever 30.

37 is a reset rod for resetting the selection lever 30 from the operating position to the standby position.

Reference numeral 38 denotes a pressing member that faces the type at the printing position, the printing paper 39, and the ink ribbon 60, and presses the printing paper 39 during printing to perform printing.

40 is a drive gear for reciprocating the type wheel 22, and has teeth 41, a concentric cam portion 42, and a toothless notch portion 43 on the outer periphery.
is provided and rotates in one direction counterclockwise.

A driven gear 45 is fixed to the reciprocating rotation shaft 20, has a toothless notch 46 on its outer periphery, and has approximately the same number of teeth as the drive gear 40; Eccentric cams 44 and 47 that do not engage with the forward stroke of the driven gear 45 but engage only with the backward stroke are provided on the side surfaces.

48 is a torsion coil spring whose one end is fixed to the driven gear 45 and the other end is fixed to a pin 49 planted on the frame of the device, etc., and which applies a counterclockwise torque; and 51 is a stop lever fixed to the back side of the driven gear 45. -50 to determine the standby position of the driven gear 45, and engages with a stopper pin 52 fixed to a frame or the like.

The above is the configuration of the printing device according to the present invention. Next, the operation of the reciprocating device for reciprocating the type wheel 22 will be explained using FIGS. 1 and 2.

FIG. 1 shows a state in which the driven gear 45 is at the standby position lζ, and the stopper 51 is moved by the action of the torsion coil spring 48.
The stop lever 50 is in contact with the stop lever 50, and the driven gear 45 is waiting at the position shown in the figure. When the drive gear 40 rotates counterclockwise, the teeth 41 begin to mesh with the driven gear 45. At the same time as the meshing starts, the driven gear 45 is activated by the torsion coil spring 48.
Rotate clockwise while winding up. Since the teeth 41 and the driven gear 45 have the same number of teeth, at the same time when the final tooth 41-n of the teeth 41 finishes meshing, the concentric cam portion 42 pushes up the final tooth 45-n of the driven gear 45. Sliding. The above operation is the forward stroke of the driven gear 45. Incidentally, FIG. 2 shows this sliding state. The driven gear 45 stops rotating while the concentric cam portion 42 forming the center angle ψ is sliding on the teeth 45-n. At the same time as the sliding movement between the concentric cam portion 42 and the teeth 45-n ends, the driven gear 45 is released from the gear restraint and starts to rotate counterclockwise under the action of the torsion coil spring 48. At this time, the cam 44 of the drive gear 40 and the cam 47 of the driven gear 45 start to engage for the first time, and the engagement is disengaged after a certain point, the driven gear 45 is released from being restrained by the cam, and the stop lever 50 is moved to the stop position. Rotate until it comes into contact with 151.
That is, this is the return process of the driven gear. More than 4 driven gears
The printing operation of the type wheel will be explained in accordance with the reciprocating motion of No. 5. As the driving gear 40 rotates counterclockwise, the gears mesh with each other, and the driven gear 45 starts rotating clockwise. Naturally, the reciprocating rotation shaft 20 also begins to rotate clockwise. Due to the rotation of the reciprocating rotation shaft 20, the protrusion 6 of the spring member 29
1, the type wheel 22 also rotates in the same direction. If a pulsed voltage is applied to the electromagnet 35 just before the type 23 to be printed comes to the printing position, the selection lever 30 will rotate counterclockwise due to the suction action of the electromagnet 35 and engage with the serrated teeth 24, allowing the selection lever 30 to be printed. The type to be printed is locked in the printing position. The protrusion 61 of the type ring spring 29 on the type ring 22 locked by the selection lever 30 leaves the notch 21 of the reciprocating rotation shaft 20, and after leaving, the reciprocation rotation shaft 20 is selected. A portion of the protruding portion 61 of the type ring spring 29 slides on the outer periphery of the reciprocating rotation shaft 20 until the stroke is completed and stopped.

The friction torque caused by this sliding causes the serrated teeth 24 to come into contact with the selection lever 30, and serves to maintain the type wheel 22 at the selected position until the selection is completed. When the selection of each digit is completed in this way, the concentric cam portion 4 of the drive gear 40
2 enters a sliding state with the driven gear 45 as shown in FIG. If the pressing member 38 is pressed in the direction of the arrow during this sliding state, printing will be performed on the printing paper 39. Next, when this printing process, that is, the sliding state of the driven gear 45 is completed, the driven gear 45 begins to rotate counterclockwise due to the action of the torsion coil spring 48.

The cam 44 and the cam 47 are engaged, and the driven gear 45 is rotated under the control of the cam engagement. When the reciprocating rotation shaft 20 starts to rotate counterclockwise, the set rod 37 is displaced in the direction of the arrow to disengage the selection lever 30 from the serrated teeth. It rotates together with the reciprocating rotation shaft 20 until it hits the claw part of the selection lever 30,
After the contact, only the reciprocating rotation shaft 20 rotates to the position where the protrusion 61 of the type ring spring 29 falls into the notch 21. That is, the reciprocating rotation axis returns to the position before the start of the selection stroke, and all printing operations are completed. Furthermore, to explain the stop mechanism consisting of a stop lever 50, a stopper 51, and a stopper pin 52 for stopping and positioning the reciprocating rotation device, in the standby state, the spring force of the torsion coil spring 48 causes the stop lever 50 and the stopper 5 to
The stop lever 50 and the stopper 51 are naturally brought out of contact by the rotation of the driven gear 45 during the forward stroke. In the backward stroke, from the time when the cam 44 of the drive gear 40 and the cam 47 of the driven gear 45 are disengaged, the driven gear 45 moves counterclockwise to the stop lever 50 and the stop lever by the spring energy of the torsion coil spring 48 stored in the forward stroke. 151 until they come into contact. The stop mechanism of the first embodiment will be explained in more detail with reference to FIGS. 3 and 4.

70 is a reciprocating rotation shaft, 71 is a stop lever, 72 is a stopper, and 73 is a stopper pin.

Draw a tangent from the center of the reciprocating rotation shaft 70 to the outer periphery of the stopper 72, use the line connecting the contact point and the center of the stopper 72 as the base line, and use the line connecting the contact point of the stop lever 71 and the stopper 72 and the center of the stopper 72 as the base line. As an auxiliary line,
The angle between the action auxiliary line and the base line is θ. In the return process of the reciprocating rotational movement (in the direction of arrow b), the stop lever 71 and the stopper 72 come into contact, and at the point of contact, a resultant force F of a force directed toward the center of the stopper 72 and a force H generated by friction acts. By providing θ as described above, the kinetic energy of the stop lever 71 and the member fixed thereto is transferred to the stop lever 71.
Since the stress is dispersed when the stopper 1 and the stopper 72 come into contact with each other, breakage due to stress concentration is eliminated, and it is therefore possible to have a commensurately small stop mechanism. Furthermore, since the stopper 72 is arranged with a space around the outer periphery of the stopper pin 31, the force H becomes a rotational force at the contact point between the stopper lever 71 and the stopper 72, and the stopper 72 is constantly rotated. Therefore, the contact point of the stopper 72 constantly moves, so the reliability of the stopper 72 is greatly improved. Furthermore, since the stopper 72 is made of highly elastic material such as rubber or plastic, it can be easily attached and detached even if the stopper pin 73 is provided with a protrusion 73-1 to prevent it from coming off.
Note that the stopper 72 is provided with a recess 72-1 and a protrusion 73-1.
It is set to be in 1. Further, since the stopper 72 is arranged with a space provided around the outer periphery of the stopper pin 73, a good effect is provided for the above-mentioned attachment and detachment. Furthermore, since the elasticity of the rubber or plastic of the stopper 72 or the elasticity of the stop lever 71 is used to gradually buffer the force caused by the collision energy, the application concentration due to the collision is eliminated, and the collision noise is reduced. , vibrations caused by collisions are reduced, and the reliability of each member is further improved. Note that the stop lever 71 is a driven gear 45 (Fig. 1).
It can also be used by being attached to. Next, a second embodiment will be explained using FIG. 5.

This relates to the structure of the stop mechanism, 80 is a reciprocating rotation shaft, 81 is a stop lever, 82 is a stopper, 8
3 is a stopper pin, and 84 is a guide pin that guides the stopper 82. The stopper 82 is made of plastic or metal elastic material to absorb the energy caused by the collision, and is used in the return process (in the direction of arrow d). When the stop lever 81, which has kinetic energy, collides with the stopper 82 near the end of the collision, the stopper 82 can rotate freely relative to the stopper pin 83 and is also guided with some play by the guide pin 84, so that the collision occurs at the same time. It deforms elastically to gradually absorb the energy.In particular, the middle part 82-1 of the stopper has an elongated shape to facilitate elastic deformation, so stress concentration due to the collision is eliminated, the collision noise is reduced, and the impact noise is reduced. The vibrations caused by this are reduced, and the reliability of each member is further improved.As described above, according to the present invention, at least one of the stopper 1 and the stop lever 1 is made of an elastic member, so that the type ring can be In the process of returning to the standby position, the collision between the stopper 1 and the stopper lever 1 can be alleviated, which reduces the collision noise and suppresses vibrations caused by the collision, allowing the type wheel to be positioned at the normal standby position. Effects can be obtained.

[Brief explanation of drawings]

FIG. 1 is a side development view showing a specific example of the present invention, and FIG. 2 is a plan view explaining the operation of the specific example shown in FIG. 23 is a type wheel, 23 is a type, 24 is a serrated tooth, 25 is a part of a stopper, 29 is a spring member, 30 and 35 are a selection lever and an electromagnet constituting a type selection means, 38 is a pressing member, 40 is a drive gear, 41
, 42 is a concentric cam portion, 45 is a driven gear, 48 is a torsion coil spring, 50 is a stop lever, 51 is a stopper, and 52 is a stopper pin. 3 and 4 are a plan view and a perspective view showing the stop mechanism of the first embodiment of the present invention, in which 70 is a reciprocating rotation shaft, 71 is a stop lever, 72 is a stopper, and 73 is a stopper pin. . FIG. 5 shows the second stop mechanism of the present invention.
80 is a reciprocating rotation shaft, 81 is a stop lever, 82 is a stopper, and 83 is a stopper pin.

Claims (1)

[Scope of Claims] 1. A type wheel with type arranged on its outer periphery; a reciprocating shaft that pivots on the type wheel and rotates it back and forth; and a reciprocating shaft that engages with the reciprocating shaft and rotates the reciprocating shaft. a type ring spring attached to the type ring so as to transmit the information to the type ring, and a part of the outer periphery thereof includes teeth, a concentric cam, a notch, and an eccentric cam located corresponding to the notch. a drive gear that rotates in one direction so as to reciprocate the reciprocating rotation shaft; and a tooth portion that is fixed to the reciprocation rotation shaft and engages with the tooth portion when selecting the type wheel to reciprocate the type wheel. a driven gear having a notch that engages with the concentric cam and temporarily stops the reciprocating shaft when printing; save,
A spring member that releases the energy during backward rotation, and the driven gear that engages with the eccentric cam when the type wheel returns to rotate the reciprocating shaft by the spring force of the spring member. a stopper fixed to the frame; and a stop lever fixed to the reciprocating shaft and colliding with the stopper when the reciprocating shaft rotates back and forth to position the type wheel in a standby position. , wherein at least either the stopper or the stop lever is an elastic body.