Printing positioning mistake proofing device

Abstract

The utility model relates to a printing positioning mistake proofing device which comprises a pressing plate, a left support and a right support. At least two pressing plate positioning column installation plates are fixed to the front end face of the pressing plate, each pressing plate positioning column installation plate is provided with a pressing plate positioning column, the axes of all the pressing plate positioning columns are located in the same plane, at least two pressing plate fixing holes are formed in the middle of the pressing plate, and the pressing plate positioning columns are located in the pressing plate fixing holes. A left support positioning column arranged downwards is fixed to the front end of the left support, the axis of the left support positioning column is parallel to the plane where the axes of all the pressing plate positioning columns are located, a right support positioning column arranged downwards is fixed to the front end of the right support, and a height difference exists between the right support positioning column and the left support positioning column. According to the utility model, leftward deviation, rightward deviation or rotation deviation of the semiconductor product can be effectively detected, and the product quality is improved; the device is simple and reliable in structure and convenient to maintain.

Description

Technical Field

[0001] The utility model relates to the technical field of IC product production devices, and specifically discloses a printing positioning error-proofing device used when printing on the surface of an IC product. Background Art

[0002] With the development of semiconductor product surface marking printing, the requirements for product printing positioning are constantly increasing. In order to improve product quality and production efficiency and reduce production costs, the existing printing unit has insufficient error prevention for printing positioning, and there is a disadvantage that the left and right position deviation of the product cannot be detected and alarmed. Summary of the invention

[0003] The utility model aims to overcome the deficiencies in the prior art and provide a printing positioning error-proofing device which can effectively detect printed products with left deviation, right deviation and rotation deviation and improve the printing quality of the products.

[0004] According to the technical solution provided by the utility model, the printing positioning error prevention device comprises a pressing plate, a left bracket and a right bracket; the pressing plate is a long strip plate body, at least two pressing plate positioning column mounting plates are fixed on the front end surface of the pressing plate, a pressing plate positioning column is mounted on each pressing plate positioning column mounting plate, the pressing plate positioning column is cylindrical, the axis of the pressing plate positioning column is perpendicular to the plane where the pressing plate is located, the axes of all the pressing plate positioning columns are located in the same plane, at least two pressing plate fixing holes are opened in the middle of the pressing plate, and the axes of the pressing plate fixing holes are perpendicular to the plane where the pressing plate is located;

[0005] The left bracket is fixed to the left end of the pressure plate and part of the left bracket extends forward from the pressure plate. A left bracket positioning column arranged downward is fixed to the front end of the left bracket. The axis of the left bracket positioning column is perpendicular to the plane where the pressure plate is located. The axis of the left bracket positioning column is parallel to the plane where the axes of all the pressure plate positioning columns are located.

[0006] The right bracket is fixed at the right end portion of the pressure plate and part of the right bracket extends forward of the pressure plate, a right bracket positioning column arranged downward is fixed at the front end portion of the right bracket, the axis of the right bracket positioning column is perpendicular to the plane where the pressure plate is located, the right bracket positioning column is located in front of the pressure plate positioning column, the height of the right bracket positioning column is greater than the height of the pressure plate positioning column, and there is a height difference between the right bracket positioning column and the left bracket positioning column.

[0007] Preferably, the axis of the left bracket positioning column is located in front of the plane where the axes of all the pressure plate positioning columns are located.

[0008] Further preferably, the height of the left bracket positioning column is greater than the height of the pressure plate positioning column.

[0009] Preferably, the height of the left bracket positioning column is greater than the height of the right bracket positioning column.

[0010] Further preferably, the upper section of the left bracket positioning column is a cylinder, and the lower section is a truncated cone, the cylinder section and the truncated cone section are coaxially connected, the upper end diameters of the cylinder section and the truncated cone section are equal, and the small end of the truncated cone section faces downward;

[0011] The upper section of the right bracket positioning column is a cylinder, and the lower section is a frustum, the cylinder section and the frustum section are coaxially connected, the upper end diameters of the cylinder section and the frustum section are equal, and the small end of the frustum section faces downward;

[0012] The frustum section of the left bracket positioning column is entirely located below the frustum section of the right bracket positioning column.

[0013] Preferably, at least two left-side pressure plate mounting holes are opened on the left end portion of the pressure plate, and the left-side pressure plate mounting holes are internal threaded holes; at least two left-side bracket mounting holes are opened on the left bracket, and the left-side bracket mounting holes are cylindrical light holes; fastening bolts are installed in the left-side pressure plate mounting holes and the left bracket mounting holes to fix the left bracket to the upper surface of the left end portion of the pressure plate.

[0014] Preferably, at least two right side pressure plate mounting holes are opened at the right end of the pressure plate, the right side pressure plate mounting holes are internal threaded holes, and the right side pressure plate mounting holes are arranged in a straight line in the length direction of the pressure plate; a right bracket waist-shaped adjustment hole is opened on the right bracket, the right bracket waist-shaped adjustment hole is a cylindrical light hole, and the length direction of the right bracket waist-shaped adjustment hole is consistent with the length direction of the pressure plate; fastening bolts are installed in the right side pressure plate mounting hole and the right bracket waist-shaped adjustment hole to fix the right bracket to the upper surface of the right end portion of the pressure plate.

[0015] The utility model can effectively detect the left and right deviations of products and improve product quality; the utility model has a simple and reliable structure and is easy to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the front view of the utility model.

[0017] Figure 2 It is a top view of the utility model.

[0018] Figure 3 It is an enlarged left view of the utility model. DETAILED DESCRIPTION

[0019] The utility model is further described below in conjunction with specific embodiments.

[0020] like Figure 1-3As shown, the printing positioning error prevention device of the utility model comprises a pressing plate 1, a left bracket 2 and a right bracket 3; the pressing plate 1 is a long strip plate body, at least two pressing plate positioning column mounting plates 1.3 are fixed on the front end surface of the pressing plate 1, and a pressing plate positioning column 1.1 is installed on each pressing plate positioning column mounting plate 1.3, the pressing plate positioning column 1.1 is cylindrical, the axis of the pressing plate positioning column 1.1 is perpendicular to the plane where the pressing plate 1 is located, and the axes of all the pressing plate positioning columns 1.1 are located in the same plane, and at least two pressing plate fixing holes 1.2 are opened in the middle of the pressing plate 1, and the axis of the pressing plate fixing hole 1.2 is perpendicular to the plane where the pressing plate 1 is located;

[0021] The left bracket 2 is fixed to the left end of the pressing plate 1 and part of the left bracket 2 extends forward from the pressing plate 1. A left bracket positioning column 2.1 is fixed to the front end of the left bracket 2 and is arranged downward. The axis of the left bracket positioning column 2.1 is perpendicular to the plane where the pressing plate 1 is located, and the axis of the left bracket positioning column 2.1 is arranged parallel to the plane where the axes of all the pressing plate positioning columns 1.1 are located; the left bracket positioning column 2.1 is located in front of the pressing plate positioning column 1.1, and the height of the left bracket positioning column 2.1 is greater than the height of the pressing plate positioning column 1.1;

[0022] The right bracket 3 is fixed to the right end portion of the pressure plate 1 and part of the right bracket 3 extends forward from the pressure plate 1. A right bracket positioning column 3.1 is fixed to the front end portion of the right bracket 3 and is arranged downward. The axis of the right bracket positioning column 3.1 is perpendicular to the plane where the pressure plate 1 is located. The right bracket positioning column 3.1 is located in front of the pressure plate positioning column 1.1. The height of the right bracket positioning column 3.1 is greater than the height of the pressure plate positioning column 1.1, and there is a height difference between the right bracket positioning column 3.1 and the left bracket positioning column 2.1.

[0023] The height of the right bracket positioning column 3.1 is less than the height of the left bracket positioning column 2.1. When the semiconductor product is fed through the machine equipment, it will first pass under the right bracket positioning column 3.1 until the semiconductor product is adjacent to or touches the left bracket positioning column 2.1, so as to complete the positioning of the semiconductor product in the length direction. In some embodiments, a buffer component, such as a rubber sleeve, can be provided at the end of the left bracket positioning column 2.1 to prevent the semiconductor product from being damaged when it touches the left bracket positioning column 2.1.

[0024] The axis of the left bracket positioning column 2.1 is located in front of the plane where the axis of all the pressure plate positioning columns 1.1 are located. Because when the semiconductor product has only a small angle deviation, the position detected by the left bracket positioning column 2.1 is located in front of the pressure plate positioning column 1.1, which can more sensitively detect the deviation of the rotation pattern.

[0025] In some optional embodiments, the height of the left bracket positioning column 2.1 may be the same as or different from the height of the pressure plate positioning column 1.1. Preferably, the height of the left bracket positioning column 2.1 is higher than the pressure plate positioning column 1.1. Because the left bracket positioning column 2.1 is higher, the deviation can be detected earlier during the rising process of the semiconductor product.

[0026] The height of the left bracket positioning column 2.1 is greater than the height of the right bracket positioning column 3.1.

[0027] The upper section of the left bracket positioning column 2.1 is a cylinder, and the lower section is a truncated cone. The cylinder section and the truncated cone section are coaxially connected. The upper end diameters of the cylinder section and the truncated cone section are equal, and the small end of the truncated cone section faces downward.

[0028] The upper section of the right bracket positioning column 3.1 is a cylinder, and the lower section is a truncated cone. The cylinder section and the truncated cone section are coaxially connected. The upper end diameters of the cylinder section and the truncated cone section are equal, and the small end of the truncated cone section faces downward.

[0029] The frustum section of the left bracket positioning column 2.1 is located as a whole below the frustum section of the right bracket positioning column 3.1, that is, in the structure where the left bracket positioning column 2.1 extends downward beyond the lower end surface of the right bracket positioning column 3.1, a part is the cylindrical section of the left bracket positioning column 2.1, so that the part that contacts the product is cylindrical.

[0030] At least two left pressure plate mounting holes 1.4 are provided at the left end of the pressure plate 1, and the left pressure plate mounting holes 1.4 are internal threaded holes; at least two left bracket mounting holes 2.2 are provided on the left bracket 2, and the left bracket mounting holes 2.2 are cylindrical light holes; fastening bolts are installed in the left pressure plate mounting holes 1.4 and the left bracket mounting holes 2.2 to fix the left bracket 2 to the upper surface of the left end of the pressure plate 1.

[0031] At least two right side pressure plate mounting holes 1.5 are provided at the right end of the pressure plate 1, the right side pressure plate mounting holes 1.5 are internal threaded holes, and are arranged in a straight line in the length direction of the pressure plate 1; a right bracket waist-shaped adjustment hole 3.2 is provided on the right bracket 3, the right bracket waist-shaped adjustment hole 3.2 is a cylindrical light hole, and the length direction of the right bracket waist-shaped adjustment hole 3.2 is consistent with the length direction of the pressure plate 1; fastening bolts are installed in the right side pressure plate mounting hole 1.5 and the right bracket waist-shaped adjustment hole 3.2 to fix the right bracket 3 to the upper surface of the right end of the pressure plate 1.

[0032] The printing positioning error prevention device is used to perform a printing positioning error prevention method, the method comprising the following steps:

[0033] S1. Provide a semiconductor product;

[0034] S2. Provide the printing positioning error prevention device matched with the semiconductor product, wherein a first sensor is disposed adjacent to the left bracket positioning column 2.1, and the first sensor is used to detect that when the semiconductor product moves from a first height to a second height, the semiconductor product hits the left bracket positioning column 2.1 and alarms; a second sensor is disposed adjacent to the right bracket positioning column 3.1, and is used to detect that when the semiconductor product moves from a first height to a second height, the semiconductor product hits the right bracket positioning column 3.1 and alarms;

[0035] S3, first make the plane where the semiconductor product is located parallel to the plane where the pressing plate 1 is located, and then move the semiconductor product from under the right bracket positioning column 3.1 toward the left bracket positioning column 2.1 until the left side frame of the semiconductor product is close to or touches the left bracket positioning column 2.1;

[0036] S4, the semiconductor product is moved from the first height to the second height along the length direction of the left bracket positioning column 2.1, so that the right bracket positioning column 3.1 is close to or touches the right side frame of the semiconductor product;

[0037] S5. When the semiconductor product moves from the first height to the second height, the semiconductor product hits the left bracket positioning column 2.1 and an alarm is sounded, and the operator then assists in restoring and eliminating the problem; when the semiconductor product moves from the first height to the second height, the semiconductor product hits the right bracket positioning column 3.1 and an alarm is sounded, and the operator then assists in restoring and eliminating the problem; when the semiconductor product moves from the first height to the second height, the pressure plate positioning column 1.1 passes through the alignment hole on the semiconductor product, and the printing positioning error prevention method is completed.

[0038] The printing positioning error prevention device of the present invention is installed on the positioning base of the printing device through the pressure plate fixing hole 1.2, and the position of the semiconductor product to be printed is positioned through the pressure plate positioning column 1.1. In some embodiments, the semiconductor product can be a lead frame or other types of substrates.

[0039] The utility model is further described below using the lead frame as an example. When the lead frame is transported to the carrier of the printing device, the left bracket positioning column 2.1 positions the left side of the lead frame so that the left bracket positioning column 2.1 is located outside the left side frame of the lead frame, and the right bracket positioning column 3.1 positions the right side of the lead frame so that the right bracket positioning column 3.1 is located outside the right side frame of the lead frame. The position of the lead frame in the length direction is limited by the left bracket positioning column 2.1 and the right bracket positioning column 3.1, so as to facilitate the subsequent up and down movement of the lead frame for printing. The installation position of the right bracket 3 in the left and right directions can be adjusted through the right bracket waist-shaped adjustment hole 3.2, so that the spacing between the left bracket positioning column 2.1 and the right bracket positioning column 3.1 can be adjusted to match the length of the lead frame.

[0040] Specifically, the above-mentioned printing process is to perform laser printing on the lead frame. In this laser printing process step, a lead frame is first provided and set on a printing platform. Each lead frame has a plurality of unit products, and the plurality of unit products are neatly arranged on the lead frame. Preferably, the plurality of unit products are arranged in a matrix. Positioning holes are provided on the lead frame. When the printing platform moves relative to the pressure plate 1, for example, the platform moves upward toward the pressure plate 1 through a motor or a cylinder, the positioning holes on the lead frame can be used to accommodate the pressure plate positioning posts 1.1, so that the pressure plate positioning posts 1.1 can be respectively inserted into the positioning holes. The pressure plate positioning posts 1.1 can include more than two, thereby performing positioning to confirm whether the lead frame is offset to the left, offset to the right or rotated.

[0041] The printing platform moves the lead frame to the first position of the laser printing process (i.e., the position directly below the printing positioning error prevention device of the present invention) at the first height. At this time, the plane positions (on the X-axis and Y-axis) of the multiple unit products arranged in a matrix on the lead frame are within the laser printing range of the laser printing process. When the first position is correctly positioned, the printing platform begins to rise through a motor or cylinder, that is, it moves longitudinally (i.e., in the Z-axis direction), and raises the lead frame to the second height together, so that the unit product of the lead frame is not only within the plane position within the laser printing range, but also further makes the longitudinal position of the unit product within the focal length range of the laser printing, so that the laser can effectively print the default state (size, position, thickness, etc.) on the product. In the process of adjusting the lead frame to the longitudinal focal length range of the laser, during the rising process, the lead frame moves in the longitudinal direction, so that the lead frame moves in the direction of the printing positioning error prevention device.

[0042] During the longitudinal movement of the lead frame, the first state of offset confirmation (leftward offset, rightward offset or rotational offset) is performed. The printing platform intends to transport the lead frame to the first position of the laser printing process (i.e., the position directly below the printing positioning error prevention device of the present invention) at the first height, but the lead frame has an abnormal leftward, rightward or rotational offset, so that the lead frame is transported to the first height of the second position (i.e., the position not directly below the printing positioning error prevention device of the present invention). The printing platform begins to rise, i.e., move longitudinally, and move the lead frame longitudinally in the direction of the second height. Before reaching the second height during the movement, the lead frame contacts the left bracket positioning column 2.1 or the right bracket positioning column 3.1, and pushes the left bracket positioning column 2.1 or the right bracket positioning column 3.1 in the longitudinal direction, so that the printing positioning error prevention device of the present invention rises, and then moves away from the detection sensor of the printing positioning error prevention device of the present invention, so that the detection sensor signal changes, thereby detecting that the lead frame has an abnormal leftward, rightward or rotational offset and alarming, and the operator then assists in recovery and elimination.

[0043] Further, while adjusting the lead frame height to within the laser focal length range, the second state offset confirmation is also performed. On the right side of the lead frame, there is an area outside the lead frame range as the right virtual detection area. When the printing platform rises to move the lead frame to the second height, the right bracket positioning column 3.1 passes through the right virtual detection area outside the lead frame range. At this time, the bottom surface of the right bracket positioning column 3.1 does not contact the lead frame, and the side surface of the right bracket positioning column contacts the right side surface of the lead frame. In some optional embodiments, the bottom surface of the right bracket positioning column 3.1 does not contact the lead frame, and the right bracket positioning column 3.1 does not contact the right side surface of the lead frame, and there is a gap between them. In some optional embodiments, when the left bracket positioning column 2.1 is at the first height, it is used to make the lead frame press against the left bracket positioning column 2.1. When the printing platform rises to move the lead frame to the second height, the left bracket positioning column 2.1 is maintained in the left virtual detection area outside the lead frame range to ensure the position of the lead frame in the left range.

[0044] After completing the offset confirmation of the second state, the bottom surface of the left bracket positioning column 2.1 does not contact the lead frame; further, the bottom surface of the left bracket positioning column 2.1 is lower than the upper surface of the lead frame; further, the bottom surface of the left bracket positioning column 2.1 is lower than the horizontal height of the lead frame. From the perspective of the left side of the lead frame, the left bracket positioning column 2.1 overlaps with the lead frame at the horizontal height of the lead frame. At this time, it can be confirmed that the left position of the lead frame has no offset. At this time, the bottom surface of the right bracket positioning column 3.1 does not contact the lead frame; further, the bottom surface of the right bracket positioning column 3.1 is lower than the upper surface of the lead frame; further, the bottom surface of the right bracket positioning column 3.1 is lower than the horizontal height of the lead frame. From the perspective of the right side of the lead frame, the right bracket positioning column 3.1 overlaps with the lead frame at the horizontal height of the lead frame. At this time, it can be confirmed that the right position of the lead frame has no offset. In some optional embodiments, the left position of the lead frame has no offset and the right position of the lead frame has no offset are confirmed and exist at the same time.

[0045] Next, the process of detecting the abnormal offset by using the second-mode offset confirmation step when the lead frame is abnormally offset is introduced. When the lead frame is abnormally offset to the left, the second-mode offset confirmation is performed, a first sensor is provided to be arranged adjacent to the left side of the lead frame, and a second sensor is provided to be arranged adjacent to the right side of the lead frame. The printing platform intends to transport the lead frame to the first height of the first position of the laser printing process, but the lead frame is abnormally offset to the left, so that the lead frame is transported to the first height of the second position, and the printing platform begins to rise, that is, to move longitudinally, and move the lead frame longitudinally in the direction of the second height. The left bracket positioning column 2.1 is located on the longitudinal action path of the left side of the lead frame. During the movement, it is pushed in the longitudinal direction of the lead frame before reaching the second height, so that the left side of the pressure plate 1 is tilted, and then away from the first sensor, so that the first sensor signal changes, thereby detecting the abnormal leftward offset of the lead frame. In some optional embodiments, since the left bracket positioning column 2.1 and the right bracket positioning column 3.1 are arranged on the same pressure plate 1, the right side of the pressure plate 1 will also be tilted, and then away from the second sensor. In terms of timing, the left side of the pressure plate will be tilted earlier than the right side of the pressure plate; in terms of the degree of tilting, the degree of tilting of the left side of the pressure plate will be greater than that of the right side of the pressure plate. Therefore, when the first sensor signal changes and the second sensor signal does not change, it means that the lead frame moves to the left; or when the first sensor signal changes earlier than the second sensor signal, it means that the lead frame shifts to the left.

[0046] Next, the process of detecting the abnormal offset by using the offset confirmation step of the second state when another abnormal offset state of the lead frame occurs is introduced. When the lead frame is abnormally offset to the right, the offset confirmation of the second state is performed, and a first sensor is provided to be arranged adjacent to the left side of the lead frame, and a second sensor is provided to be arranged adjacent to the right side of the lead frame. In some embodiments, the printing platform intends to transport the lead frame to the first height of the first position of the laser printing process, but the lead frame is abnormally offset to the right, so that the lead frame is transported to the first height of the third position. The printing platform begins to rise, that is, to move longitudinally, and moves the lead frame longitudinally in the direction of the second height. The right bracket positioning column 3.1 is located on the longitudinal action path on the right side of the lead frame. During the movement, it is pushed in the longitudinal direction of the lead frame before reaching the second height, so that the right side of the pressure plate 1 is tilted, and then away from the second sensor, so that the second sensor signal changes, thereby detecting that the lead frame is abnormally offset to the right. In some optional embodiments, since the left bracket positioning column 2.1 and the right bracket positioning column 3.1 are arranged on the same pressure plate 1, the left side of the pressure plate 1 will also be tilted and move away from the first sensor. In terms of timing, the time when the right side of the pressure plate tilts up will be earlier than the time when the left side of the pressure plate tilts up; in terms of the degree of tilting, the degree of tilting of the right side of the pressure plate will be greater than the degree of tilting of the left side of the pressure plate. Therefore, when the second sensor signal changes but the first sensor signal does not change, it means that the lead frame moves to the right; or when the second sensor signal changes earlier than the first sensor signal changes, it means that the lead frame shifts to the right.

Claims

1. A printing positioning error prevention device, characterized in that: It comprises a pressing plate (1), a left bracket (2) and a right bracket (3); the pressing plate (1) is a long strip-shaped plate body, at least two pressing plate positioning column mounting plates (1.3) are fixed on the front end surface of the pressing plate (1), a pressing plate positioning column (1.1) is mounted on each pressing plate positioning column mounting plate (1.3), the pressing plate positioning column (1.1) is cylindrical, the axis of the pressing plate positioning column (1.1) is perpendicular to the plane where the pressing plate (1) is located, the axes of all the pressing plate positioning columns (1.1) are located in the same plane, at least two pressing plate fixing holes (1.2) are opened in the middle of the pressing plate (1), the axes of the pressing plate fixing holes (1.2) are perpendicular to the plane where the pressing plate (1) is located; The left bracket (2) is fixed to the left end of the pressure plate (1) and part of the left bracket (2) extends forward from the pressure plate (1). A left bracket positioning column (2.1) arranged downward is fixed to the front end of the left bracket (2). The axis of the left bracket positioning column (2.1) is perpendicular to the plane where the pressure plate (1) is located. The axis of the left bracket positioning column (2.1) is arranged parallel to the plane where the axes of all the pressure plate positioning columns (1.1) are located. The right bracket (3) is fixed to the right end of the pressure plate (1) and part of the right bracket (3) extends forward from the pressure plate (1). A right bracket positioning column (3.1) arranged downward is fixed to the front end of the right bracket (3). The axis of the right bracket positioning column (3.1) is perpendicular to the plane where the pressure plate (1) is located. The right bracket positioning column (3.1) is located in front of the pressure plate positioning column (1.1). The height of the right bracket positioning column (3.1) is greater than the height of the pressure plate positioning column (1.1), and there is a height difference between the right bracket positioning column (3.1) and the left bracket positioning column (2.1).

2. The printing positioning error-proofing device according to claim 1, characterized in that: The axis of the left bracket positioning column (2.1) is located in front of the plane where the axes of all the pressure plate positioning columns (1.1) are located.

3. The printing positioning error-proofing device according to claim 1 or 2, characterized in that: The height of the left bracket positioning column (2.1) is greater than the height of the pressure plate positioning column (1.1).

4. The printing positioning error-proofing device according to claim 1, characterized in that: The height of the left bracket positioning column (2.1) is greater than the height of the right bracket positioning column (3.1).

5. The printing positioning error-proofing device according to claim 4, characterized in that: The upper section of the left bracket positioning column (2.1) is a cylinder, and the lower section is a truncated cone. The cylinder section and the truncated cone section are coaxially connected. The upper end of the cylinder section and the truncated cone section have the same diameter, and the small end of the truncated cone section faces downward. The upper section of the right bracket positioning column (3.1) is a cylinder, and the lower section is a truncated cone. The cylinder section and the truncated cone section are coaxially connected. The upper end of the cylinder section and the truncated cone section have the same diameter, and the small end of the truncated cone section faces downward. The frustum section of the left bracket positioning column (2.1) is located as a whole below the frustum section of the right bracket positioning column (3.1).

6. The printing positioning error-proofing device according to claim 1, characterized in that: At least two left pressure plate mounting holes (1.4) are provided at the left end of the pressure plate (1), and the left pressure plate mounting holes (1.4) are internal threaded holes; at least two left bracket mounting holes (2.2) are provided on the left bracket (2), and the left bracket mounting holes (2.2) are cylindrical light holes; and fastening bolts are installed in the left pressure plate mounting holes (1.4) and the left bracket mounting holes (2.2) to fix the left bracket (2) to the upper surface of the left end of the pressure plate (1).

7. The printing positioning error-proofing device according to claim 1, characterized in that: At least two right side pressure plate mounting holes (1.5) are provided at the right end of the pressure plate (1), the right side pressure plate mounting holes (1.5) are internal threaded holes, and the right side pressure plate mounting holes (1.5) are arranged in a straight line in the length direction of the pressure plate (1); a right bracket waist-shaped adjustment hole (3.2) is provided on the right bracket (3), the right bracket waist-shaped adjustment hole (3.2) is a cylindrical light hole, and the length direction of the right bracket waist-shaped adjustment hole (3.2) is consistent with the length direction of the pressure plate (1); fastening bolts are installed in the right side pressure plate mounting hole (1.5) and the right bracket waist-shaped adjustment hole (3.2) to fix the right bracket (3) to the upper surface of the right end of the pressure plate (1).

Images